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5. Give scientific reasons.
a. When an object falls freely to the
ground, its acceleration is uniform.
b. Even though the magnitudes of
action force and reaction force are
equal and their directions are
opposite, their effects do not get
cancelled.
c. It is easier to stop a tennis ball as
compared to a cricket ball, when
both are travelling with the same
velocity
d. The velocity of an object at rest is
considered to be
Answers
Answer:
Answer of [A]
1.An object that falls freely to the ground has acceleration that is uniform (constant) as long as air resistance can be ignored and the object stays near enough to the earth's surface so that the gravitational field is constant.
Answer of [B]
1.Even though the magnitude of action force and reaction force are equal and their direction are opposite their effect do not get cancelled because they ACT ON DIFFERENT BODIES.
Answer of [C]
1.Tennis ball is lighter (less mass) than a cricket ball.
2.Tennis ball moving with same speed has less momentum (mass × velocity) than a cricket ball.
3. It is easier to stop tennis ball having less momentum
Answer of [D]
1.THE VELOCITY OF AN OBJECT IS SAID TO BE IN UNIFORM MOTION WHEN IT'S SPEED IS CONSTANT ALL THE TIME.
2. FOR AN OBJECT AT REST,IT'S SPEED IS ZERO ALL THE TIME.
3.THEREFORE, THE VELOCITY OF AN OBJECT AT REST CAN BE CONSIDERED TO BE UNIFORM.
Explanation:
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Answer:
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