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Which of the following is/are the example(s) of force that changes the speed of a moving body?

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Pressing the accelerator of a car

Pulling a moving bicycle from behind

Both 1 and 2

None

answer is C.

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Detailed Solution

Increasing the speed of a car and pulling a bicycle are examples of force that change the speed of a moving body.
A force is defined as a push or a pull, which either causes or ceases motion in an object. It is also responsible for changing the direction of motion of a moving body. By the second law of motion, we know that a force is responsible for providing acceleration to a body which in turn alters the body's speed. For example, when a driver accelerates his vehicle while it is in motion, the vehicle's speed increases. When a person uses the brakes in a car, the vehicle comes to a complete stop with a drop in speed.

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