Physics Laws of Motion Exercise3b
Please Select
Q1 Name the physical quantity which cause motion in a body.
Q2 Is force needed to keep a moving body in motion?
Q3 A ball moving on a table top eventually stops. Explain the reason.
Q4 A ball is moving on a perfectly smooth horizontal surface. If no force us applied on it, will its speed decrease, increase or remain unchanged?
Q5 What is Galileo’s law of inertia?
Q6 State Newton’s first law of motion.
Q7 State and explain the law of inertia (or Newton’s first law of motion).
Q8 What is meant by the term inertia?
Q9 Give qualitative definition of force on the basis of Newton’s first law of motion.
Q10 Name the factor on which inertia of a body depends and state how it depends on the factor stated by you.
Q11 Give two examples to show that greater the mass, greater is the inertia of the body.
Q12 ‘More the mass, more difficult it is to move the body from rest’. Explain this statement by giving an example.
Q13 Name the two kinds of inertia.
Q14 Give one example of each of the following:
(a) Inertia of rest, and (b) inertia of motion.
Q15 Two equal and opposite forces act on a stationary body. Will the body move? Give reason to your answer.
Q16 Two equal and opposite forces act on a moving object. How is its motion affected? Give reason.
Q17 An aero plane is moving uniformly at a constant height under the action of two forces (i) upward force (lift) and (ii) downward force (weight). What is the net force on the aero plane
Q18 Why does a person fall when he jumps out from a moving train?
Q19 Why does a coin placed on a card, drop into the tumbler when the card is rapidly flicked with the finger?
Q20 Why does a ball throw quesn vertically upwards in a moving train, come back to the throw queser’s hand?
Q21 Explain the following:
(a) When a train suddenly moves forward, the passenger standing in the compartment tends to fall backwards.
(b) When a corridor train suddenly starts, the sliding doors of some compartments may open.
(c) People often shake branches of a tree for getting down its fruits.
(d) After alighting from a moving bus, one has to run for some distance in the direction of bus in order to avoid falling.
(e) Dust particles are removed from a carpet by beating it.
(f) It is advantageous to run before taking a long jump
Multiple Choice type Questions :
Q1 The property of inertia is more in:
(a) A car
(b) A truck
(c) A horse cart
(d) A toy car
Q2 A tennis ball and a cricket ball, both are stationary. To start motion in them:
(a) A less force is required for the cricket ball than for the tennis ball
(b) A less force is required for the tennis ball than for the cricket ball
(c) Same force is required for both the balls
(d) Nothing can be said
Q3 A force is needed to:
(a) Change the state of motion or state of rest of the body
(b) Keep the body in motion
(c) Keep the body stationary
(d) Keep the velocity of body constant
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