Problem: Consider the following two situations:A) A person pushes on a wall without moving.B) A person runs and accelerates.For each case, answer the following questions:  i. Identify the relevant forces acting on the personii.  Does Newton’s Third Law apply? If it applies, what are the 3rd law pairs?  iii. Why is/isn't the person accelerating?

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A) 

For every force applied, there is a reaction force of equal magnitude and acting in the opposite direction.  

i. The normal force of equal magnitude as the force applied on the wall acts on the person. Static friction on the person's feet allows him to maintain the push. The ground exerts a normal force that supports him vertically.

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Problem Details

Consider the following two situations:

A) A person pushes on a wall without moving.

B) A person runs and accelerates.

For each case, answer the following questions:  

i. Identify the relevant forces acting on the person

ii.  Does Newton’s Third Law apply? If it applies, what are the 3rd law pairs?  

iii. Why is/isn't the person accelerating?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Friction concept. If you need more Friction practice, you can also practice Friction practice problems.