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question_answer1) What do you understand by rest and motion?
question_answer2) Give an example of indirectly perceivable motion.
question_answer3) Give an example of a body which may appear to be moving for one person and stationary for the other.
question_answer4) How can we describe the location of an object?
question_answer5) Differentiate between distance and displacement.
question_answer6) What do you mean by average speed? H What are its units?
question_answer7) What is acceleration? How will you express it mathematically?
question_answer8) A bridge is 500 m long. A 100 m long train crosses the bridge at a speed of 30 m/s. Find the time taken by train to cross it.
question_answer9) A car covers first 50 km at a uniform velocity of 45 km/h and the next 50 km at 90 km/h. Find the average velocity of the car.
question_answer10) A train starts from rest and accelerates uniformly for 30 s to attain a velocity of 72 km/h. Find its acceleration.
question_answer11) A bus retards uniformly at a rate of 3 m/s2 and stops in 10 s. With what velocity was the bus travelling?
question_answer12) Velocity of a train changes from 20 m/s to 25 m/s, when it accelerates at a rate m/s2. Find the distance covered by the train.
question_answer13) Derive first equation of motion graphically.
question_answer14) Study the Following distance-time graph and compare the velocity of the two objects.
question_answer15) Make a velocity-time graph from the following displacement-time graph.
question_answer16) A girl walks along a straight path to drop a letter in the letter box and comes back to her initial position. Her displacement -time graph is shown in figure. Plot a velocity-time graph for the same.
question_answer17) Find the displacement of a body whose velocity- time graph is shown below.
question_answer18) Suppose you go up a tower 80 m high and throw a ball horizontally with a velocity of 20 m/s. What will be the shape of the path followed by the ball? While falling, the motion of the ball will be a combination of two independent motions. Name these motions.
question_answer19) A fan rotates at 100 rpm. Find its angular velocity and linear velocity if tip of its blades is 0.20 m away from the axis of rotation.
question_answer20) An ant climbs up five stairs, each of width 20 cm and height 20 cm. Find the distance covered and displacement of ant.
question_answer21) How will the equations of motion for an object moving with a uniform velocity change?
question_answer22) Draw a velocity versus time graph of a stone thrown vertically upward and then coming downwards after attaining the maximum height.
question_answer23) When two bodies move uniformly towards each other, the distance between them decreases by 8 m/s. If both the bodies move in the same direction with the same speeds, the distance between them increases by 4 m/s. What are the speeds of two bodies?
question_answer24) Can an object be accelerated if it is moving with constant speed? Justify your answer with an example. Or Can a body have constant speed and still be accelerating? Give an example. Or Explain how is it possible for an object to move with a constant speed but with uniform acceleration.
question_answer25) An object P is moving with a constant velocity for 5 min. Another object Q is moving with changing velocity for 5 min. Out of these two objects, which one has acceleration. Explain.
question_answer26) Two trains A and B start moving at the same time. The distances travelled by them in given intervals of time are shown below. State which train has uniform motion and which train has non-uniform motion. Time Distance travelled by train A (in km) Distance travelled by train B (in km) 6.00 pm 0 0 6.15 pm 10 15 6.30 pm 20 24 6.45 pm 30 32 7.00 pm 40 38 7.15 pm 50 42 7.30 pm 60 47
question_answer27) What do the graphs I and II show here indicate?
question_answer28) Two stones are thrown vertically upwards simultaneously with their initial velocities and respectively. Prove that the heights reached by them would be in the ratio (Assume upward acceleration is -g and downward acceleration is +g).
question_answer29) On a 100 km track, a train travels the first 30 km at a uniform speed of 30 km/h. How fast must the train travel the next 70 km, so as to average 40 km/h for the entire trip?
question_answer30) Give one example of each of the following situations. (i) Uniformly accelerated motion. (ii) Motion with uniform retardation. (iii) Accelerated motion with uniform magnitude of velocity. (iv)Motion in a direction with acceleration in perpendicular direction. (v) Motion in which v-t graph is a horizontal line parallel to x-axis.
question_answer31) An electron moving with a velocity of x 104 m/s enters into a uniform electric field and acquires a uniform acceleration of 104 m/s2 in the direction of its initial motion. (i) Calculate the time in which the electron would acquire a velocity double of its initial velocity. (ii) How much distance the electron would cover in this time? Sol. Given, u = 5 x 104 m/s, a = 104 m/s2 (i) (1) (ii) (2) (2)
question_answer32) The distance -time graph of two trains are given below. The trains start simultaneously in the same direction, (i) How much A is B ahead when the motion starts? (ii) What is the speed of B? (iii) When and where will A catch B? (iv)What is the difference between speeds of A and B? (iv) Is the speed of both the trains uniform or non-uniform? Justify your answer.
question_answer33) Study the speed-time graph of a body given here and answer the following questions. (i) What type of motion is represented by OA? (ii) What type of motion is represented by AB? (iii) What type of motion is represented by BC? (iv)Find out the acceleration of the body. (v) Calculate the retardation of the body. (vi) Find out the distance travelled by the body from A to B.
question_answer34) Deduce the following equations of motion (i) (ii)
question_answer35) Distance travelled by a train and time taken by it is shown in the following table. (i) Plot distance-time graph, (ii) What is the average speed of the train? (iii) When is the train travelling at the highest speed? At what distance does the train slow down? (v) Calculate the speed of the train between 10:40 AM to 11:00 AM. Time Distance (in km) 10:00 AM 10:30 AM 10:40 AM 11:00 AM 11:15 AM 11:30 AM 0 25 28 40 42 50
question_answer36) Two stones are thrown vertically upwards simultaneously with their initial velocities and respectively. Prove that the heights reached by them would be in the ratio of (Assume upward acceleration is -g and downward acceleration to be +g).
question_answer37) The driver of train A travelling at a speed of 54 kmh-1 applies brakes and retards the train uniformly. The train stops in 5 s. Another train B is travelling on the parallel with a speed of 36 kmh-1. Its driver applies the brakes and the train retards uniform madly; train B stops in 10 s. Plot speed-time graphs for both the trains on the same axis. Which of the trains travelled farther after the brakes were applied?
question_answer38) The phenomenon of motion was placed on a sound scientific footing by two scientists. Write their names.
question_answer39) Under what condition(s) is the magnitude of average velocity of an object equal to its average speed? [NCERT]
question_answer40) Are rest and motion absolute or relative terms?
question_answer41) What does the odometer of an automobile measure? [NCERT]
question_answer42) Suppose a ball is thrown vertically upwards from a position P above ground. It rises to the highest point Q and returns to the same point P. What is the net displacement and distance travelled by the ball?
question_answer43) Which speed is greater: 30 m/s or 30 km/h?
question_answer44) What do you mean by 2 m/s2?
question_answer45) Can uniform linear motion be accelerated?
question_answer46) Define one radian.
question_answer47) What is the relation between linear velocity and angular velocity?
question_answer48) Give an example when we infer the motion indirectly.
question_answer49) What is essential to describe the position of an object?
question_answer50) What is the simplest type of motion?
question_answer51) What indicates the motion of the earth?
question_answer52) If the displacement of a body is zero, is it necessary that the distance covered by it is also zero?
question_answer53) Can the displacement be greater than the distance travelled by an object?
question_answer54) When do the distance and displacement of a moving object have the same magnitude?
question_answer55) What is the quantity which is measured by the area occupied below the velocity-time graph? [NCERT]
question_answer56) Does the speedometer of a car measure its average speed?
question_answer57) A body is moving with a velocity of 10 m/s. If the motion is uniform, what will be the velocity after 10 s?
question_answer58) Can a body have constant speed but variable velocity?
question_answer59) When is the acceleration taken as negative?
question_answer60) What is uniform acceleration?
question_answer61) Give an example of non-uniform acceleration.
question_answer62) How are the distance travelled by an object related to the time taken when an object travels equal distances in equal intervals of time?
question_answer63) What would be acceleration of a body if its velocity-time graph is a line parallel to the time axis?
question_answer64) Is the motion of a body uniform or accelerated if it goes round the sun with constant speed in a circular orbit?
question_answer65) With the help of a graph, derive the relation v = u + at.
question_answer66) Distinguish between speed and velocity. [NCERT]
question_answer67) How will you show that the slope of displacement-time graph gives velocity of the body?
question_answer68) What are the characteristics of distance-time graph for an object moving with a non-uniform speed?
question_answer69) Deduce the following equations of motion: (i) (ii)
question_answer70) Given below is the velocity-time graph for the motion of the car. What does the nature of the graph show? Also find the acceleration of the car.
question_answer71) Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between 4th and 5th seconds.
question_answer72) Two stones are thrown vertically upwards simultaneously with their initial velocities and respectively. Prove that the heights reached by them would be in the ratio of (Assume upward acceleration is -g and downward acceleration to be +g)
question_answer73) The driver of train A travelling at a speed of 54 kmh-1 applies brakes and retards the train uniformly. The train stops in 5 seconds. Another train B is travelling on the parallel with a speed of 36 . Its driver applies the brakes and the train retards uniformly; train B stops in 10 seconds. Plot speed-time graphs for both the trains on the same axis. Which of the trains travelled farther after the brakes were applied?
question_answer74) Four cars A, B, C and D are moving on a levelled road. Their distance versus time graphs are shown in figure. Which car is the slowest?
question_answer75) A girl walks along a straight path to drop a letter in the letterbox and conies back to her initial position. Her displacement-time graph is shown in figure. Plot a velocity-time graph for the same. [NCERT Exemplar]
question_answer76) Suppose a squirrel is moving at a steady speed from the base of a tree towards some nuts. It then stays in the same position for a while, eating the nuts, before returning to the tree at the same speed. A graph can be plotted with distance on the x-axis and the time on y-axis. Observe the graph carefully and answer the following questions. (i)Which part of the graph shows the squirrel moving away from the tree? (ii) Name the point on the graph which is 6 m away from the base of the tree. (iii) Which part of the graph shows that the squirrel is not moving? (iv) Which part of the graph shows that the squirrel is returning to the tree? (v) Calculate the speed of the squirrel from the graph during its journey.
question_answer77) The table given below shows distance (in cm) travelled by bodies A, B and C. Read this data carefully and answer the following questions. Distance (in cm) covered by different bodies Time in (S) Body (A) Body (B) Body(C) 1st second 20 20 20 2nd second 20 36 60 3nd second 20 24 100 4th second 20 30 140 5th second 20 48 180 (i) Which of the bodies is moving with (a) constant speed? (b) constant acceleration? (c) non-uniform acceleration? (ii) Which of the bodies covers (a) maximum distance in 3rd second? (b) minimum distance in 3rd second?
question_answer78) A train accelerates uniformly from 36km/h to 72 km/h in 20 s. Find the distance travelled.
question_answer79) A car moves with a speed of 30 km/h for half an hour, 25 km/h for one hour and 40 km/h for two hours. Calculate average speed of the car.
question_answer80) Derive second equation of motion graphically.
question_answer81) State three equations of motion. Which of them describes (i) velocity-time relation? (ii) position-time relation?
question_answer82) The brakes applied to a car produce an acceleration of 6 m/s2 in the opposite direction to the motion. If the car takes 2 s to stop after the application of brakes, calculate the distance it travels during this time.
question_answer83) A train travels at a speed of 60 km/h for 0.5 h, 24 km/h for next 0.25 h and then at 72 km/h for the next 0.75 h. Calculate the distance travelled by train and its average speed.
question_answer84) What types of motions are represented by the following velocity-time graphs?
question_answer85) How will the equations of motion for an object moving with a uniform velocity change?
question_answer86) The velocity-time graph shows the motion of a cyclist. Find (i) its acceleration (ii) its velocity and (iii) the distance covered by the cyclist in 15s.
question_answer87) Express average velocity when the velocity of a body changes at a non-uniform rate and a uniform rate.
question_answer88) The velocity- time graph (see figure) shows the motion of a cyclist. Find (i) its acceleration (ii) its velocity and (iii) the distance covered by the cyclist in 15 s.
question_answer89) Draw a velocity versus time graph of a stone thrown vertically upwards and then coming downwards after attaining the maximum height.
question_answer90) The speedometer readings of a car are shown below. Find the acceleration of the car and its displacement. Time Speed do meter 9:25 AM 36 km/h 9:45 AM 72 km/h
question_answer91) Find the total displacement of the body from the following graph
question_answer92) The graph given below is the distance-time graph of an object. (i) Find the speed of the object during first four seconds of its journey. (ii) How long was it stationary? (iii) Does it represent a real situation? Justify your answer.
question_answer93) An object is moving with uniform speed in a circle of radius r. Calculate the distance and displacement (i) when it completes half the circle (ii) when it completes full circle (iii) what type of motion does the object possess?
question_answer94) An electron moving with a velocity of x 104 m/s enters into a uniform electric field and acquires a uniform accelerations of 104 m/s2 in the direction of its initial motion. (i) Calculate the time in which the electron would acquire a velocity double of its initial velocity. (ii) How much distance the electron would cover in this time?
question_answer95) A particle having initial velocity u is moving with a constant acceleration a for a time t. (i) Find the displacement of the particle in the last 1 s. (ii) Evaluate for u = 2 m/s, a = 1 m/s2 and t = 5 s.
question_answer96) Position of a particle moving along x-axis is given by x = 3t - 4t2 + t3, where x is in metres and t in seconds. (i) Find the position of the particle at t = 2 s. (ii)Find the displacement of the particle in the time interval from t = 0 to t = 4 s. (iii) Find the average velocity of the particle in the time interval from t = 2s to t = 4 s
question_answer97) Manish was travelling from Delhi to Jaipur by his car for a meeting. He had to reach the destination in the given time. So he kept a track of the odometer and his watch all through the journey to decide upon his speed. This helps him to reach on time for the meeting. (i) What measuring devices were used by Manish? (ii) What qualities of Manish are worth appreciating? (iii) Why did Manish measure the distance and time?
question_answer98) Ravi is very fond of fast driving. His sister Veena keeps telling him the hazards of speed on road. Ravi, however does not want to pay need to her advice and never listens to her. Veena convinces him by narrating incidents of hazards caused by over speeding vehicles and tells him time and again, not to drive fast. Ravi is still reluctant to understand. (i) Which values of Veena should be applauded? (ii) Elaborate upon Ravi's values? (iii) As a concerned neighbour, what suggestion would you give to Ravi's father to alert any unpleasant consequence?
question_answer99) Raman and his sister Saniya go to school together in their car. Raman drives much faster than Saniya. Saniya tells Raman not to take the risk of over speeding. She tells him that time taken to reach the school would depend upon average speed. By over speeding for a little while, the risk involved is much greater compared to the little time saved. (i) Which values are displayed by Saniya? (ii) Is Saniya right in her statement? (iii) How do you define average speed?
question_answer100) Mehakwas moving through the city roads towards her school by a car. She recorded the odometer reading of the car after every five minutes and plotted a graph for distance versus time. She then inferred about the type of motion and found average speed from the graph. (i) Which qualities of Mehak are worth mentioning? (ii) What type of motion would she have inferred? (iii) How is average speed calculated from the graph?
question_answer101) Shikhaj and Sharman went to Mathura through Yamuna-Expressway. Shikhaj started the car and accelerated so highly that the car was running at 108 km/h within 10 seconds. Sharman stopped him from doing so and told him that over speeding on road was a straight invitation to life staking situation. Though shikhaj wanted the adventure of speeding, but he was convinced by Sharman. (i) Why do you think it is dangerous to drive fast on road? (ii) Which values of Sharman are worth appreciating? (iii) What is the acceleration of the car?
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