GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How much force is needed to keep an object with a constant speed moving?
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zero
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Equal to the weight of the object
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Just enough to produce acceleration
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Greater than the frictional force met by the object
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Explanation:
Detailed explanation-1: -A body is to be moved with a constant velocity. So, its velocity should not change. When velocity does not change, acceleration is zero. Hence, no force is required to move an object with constant velocity.
Detailed explanation-2: -The reason why no force is required to move an object in motion with constant velocity: Acceleration is defined as the rate of change in velocity. So, for constant velocity, acceleration is zero and hence as per the formula for force, the force required is also zero.
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