Physics Laws of Motion Numerical3e
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Numericals
Q1 The force of attraction between two bodies at a certain separation is 10N. What will be the force of attraction between them if the separation is reduced to half?
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Q2 Write the approximate weight of a body of mass 5kg. What assumption have you made?
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Q3 Calculate the weight of a body of mass 10kg in (a) kgf and (b) newton. Take g=9.8m/s2
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Q4 State the magnitude and direction of the force of gravity acting on a body of mass 5kg. Take g=9.8m/s2
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Q5 The weight of a body is 2.0N. What is the mass of the body? (g=10 m/s2 )
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Q6 The weight of a body on earth is 98N where the acceleration due to gravity is 9.8ms-2 . What will be its (a) mass and (b) weight on moon where the acceleration due to gravity is 1.6m/s2?
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Q7 A man weighs 600N on earth. What would be his approximate weight on moon? Give reason for your answer?
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Q8 What is the (a) force of gravity and (b) weight of a block of mass 10.5kg? Take g=10 m/s2
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Q9 A ball is released from a height and it reaches the ground in 3s. If g=9.8m/s2 , find: (a) The height from which the ball was released, (b) The velocity with which the ball will strike the ground.
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Q10 What force, in newton, your muscles need to apply to hold a mass of 5kg in your hand? State the assumption.
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Q11 A ball is throw quesn vertically upwards. It goes to a height 20m and then returns to the ground. Taking acceleration due to gravity g to be 10m/s2 , find:
(a) The initial velocity of the ball
(b) The final velocity of the ball on reaching the ground and
(c) The total time of journey of the ball.
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Q12 . A body is dropped from the top of a tower. It acquires a velocity 20m/s on reaching the ground. Calculate the height of the tower. (Take g=10m/s2 )
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Q13 A ball is throw quesn vertically upwards. It returns 6s later. Calculate: (i) the greatest height reached by the ball, and (ii) the initial velocity of the ball. (Take g=10m/s2 )
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Q14 A pebble is throw quesn vertically upwards with a speed of 20m/s. How high will it be after 2s? (Take g=10m/s2 )
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Q15 . (a) How long will a stone take a fall to the ground from the top of a building 80m high and (b) what will be the velocity of the stone on reaching the ground? (Take g=10 m/s2 )
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Q16 A body falls from the top of a building and reaches the ground 2.5s later. How high is the building? (Take g=9.8m/s2 )
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Q17 A ball is throw quesn vertically upwards with an initial velocity of 49m/s. Calculate: (i) the maximum height attained, (ii) the time taken by it before it reaches the ground again. (Take g=9.8m/s2 )
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Q18 A stone is dropped freely from the top of a tower and it reaches the ground in 4s. Taking g=10m/s2 , calculate the height of the tower.
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Q19 A pebble is dropped freely in a well from its top. It takes 20s for the pebble to reach the water surface in the well. Taking g=10m/s2 and speed of sound=330m/s, find: (i) the depth of water surface, and (ii) the time when echo is heard after the pebble is dropped.
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Q20 A ball is throw quesn vertically upwards from the top of a tower with an initial velocity of 19.6m/s. the ball reaches the ground after 5s. Calculate: (i) the height of the tower, (ii) the velocity of ball on reaching the ground. Take g=9.8m/s2
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