Question

a student pushes on a crate with a force of 100 N directed to the right. what force does the crate exert on the student?

Answer 1

Answer:

• Assuming the crate doesn’t move when the student applies a force of 100 N, the crate pushes back on the student with 100 N towards the left. The only reason the student doesn’t move is because of the friction of his sneakers in contact with the floor. If there was no friction at the floor (ice) he couldn’t push the crate.

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Answer 2

The force the crate exerts on the student is $100N$

Explanation:

• When a person exerts pressure on $100N$ on the crate.
• The crate also exerts the same force on the person trying to push it.
• However, the reason that the person does not move and the crate moves are due to the reason of frictional force that happens.
• The shoes that we wear exert friction on the shoes that are in contact with the floor.  

• But the crate has got nothing therefore it moves in spite of exerting the same force on the person.