Respuesta :
Answer:
A) A child on a bicycle braking at a stop sign.
Explanation:
The child is applying the brakes to dramatically slow down the movement of his body, which couldn't be done without the bike. The bike is acting the same as a car would to us, it propels us and is capable of slowing down or stopping our motion whenever we need.
A child on a bicycle braking at a stop sign is an example that best illustrates the working of unbalanced forces.
• A force that makes a change in the motion of an object to which the force is applied is termed an unbalanced force.
• An object in steady motion or at rest will continue to be in unchanged motion or at rest unless it is subjected to an unbalanced force.
• When one applies brakes in the moving vehicle, like in the given case of a bicycle, in this, the resistance of the air and the friction of the tires rolling on the pavement are the two unbalanced forces acting to slow the bicycle.
Thus, when the brakes are applied, there is a reduction in the speed of the cyclist. therefore, an unbalanced force is acting upon it. Hence, the correct answer is option A.
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