Question bank: Dynamics: Newton's 3rd Law

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Question 1:

Very Easy

When walking on a flat and horizontal surface, a person exerts a force of 600 N to the right on the ground. According to Newton's 3rd law, the ground exerts on the person a reaction force of the same magnitude and direction, but in the opposite direction. What is the magnitude of the reaction force that the ground exerts on the person?

Dynamics: Newton's 3rd Law

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Question 2:

Medium

Newton's third law states that every action has an equal and opposite reaction. An example of this can be seen in car accidents: when two cars collide, the collision forces are equal and opposite. Additionally, when a driver brakes the car, the car is pushed forward with the same force that he is braking. Based on this information, which of the alternatives below correctly represents the application of Newton's third law?

Dynamics: Newton's 3rd Law

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Question 3:

Easy

Imagine a swimmer moving in the pool using only the arms. According to Newton's 3rd law, action and reaction are always equal and opposite. How can we apply this concept to the swimmer's situation and find out the force the swimmer exerts on the water and the force the water exerts on him? Calculate the equivalent force between the swimmer and the water, considering that the swimmer exerts a force of 20 N on both arms and knowing that action and reaction are equal and opposite.

Dynamics: Newton's 3rd Law

Question 4:

Medium

What was the force created by Isaac Newton that establishes that every action has an equal and opposite reaction?

Dynamics: Newton's 3rd Law

Question 5:

Very Hard

A block of mass m is on a flat, horizontal table, and is pushed by a constant horizontal force of magnitude F. Considering the block as an isolated system, explain based on the principle of action and reaction (3rd law of Newton) how the frictional force between the block and the table relates to the force that the block exerts on the table. Use the concept of maximum static friction force to determine the maximum value of F before the block starts moving, knowing that the static friction coefficient between the block and the table is µ. Consider that the weight force of the block acts vertically downward and that the normal force exerted by the table on the block is perpendicular to the table and has the same magnitude as the weight force of the block.

Dynamics: Newton's 3rd Law

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