A mover pushes a large packing crate across the floor in a straight line at a constant speed. What is the type of friction acting on the crate? kinetic ✓ Correct. 1-Because the crate is in motion, the type of friction exhibited in this case is kinetic friction. If the mover is applying a horizontal force of 110 N, what is the magnitude (in N) of the friction force on the crate? ⨯ Think about Newton's second law. If the velocity is constant, what's the acceleration? What's the net force? From this, if the mover pushes with a force in one direction, what must be the magnitude of the kinetic friction force in the other direction? N A large safe sits on a concrete floor. You push the safe horizontally, but the crate does not move. What type of friction force acts on the safe? static ✓ Correct. 2-Because the safe is motionless, the type of friction exhibited in this case is static friction. If the horizontal force you apply to the stationary safe above is 130 N, what is the magnitude (in N) of the friction force on the safe? ⨯ Think about Newton's second law. If the velocity is constant (it's zero and stays zero), what's the acceleration? What's the net force? From this, if you push with a force in one direction, what must be the magnitude of the static friction force in the other direction? N

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A mover pushes a large packing crate across the floor in a straight line at a constant speed. What is the type of friction acting on the crate?

kinetic ✓ Correct.

1-Because the crate is in motion, the type of friction exhibited in this case is kinetic friction.

If the mover is applying a horizontal force of 110 N, what is the magnitude (in N) of the friction force on the crate?

⨯ Think about Newton's second law. If the velocity is constant, what's the acceleration? What's the net force? From this, if the mover pushes with a force in one direction, what must be the magnitude of the kinetic friction force in the other direction? N

A large safe sits on a concrete floor. You push the safe horizontally, but the crate does not move. What type of friction force acts on the safe?

static ✓ Correct.

2-Because the safe is motionless, the type of friction exhibited in this case is static friction.

If the horizontal force you apply to the stationary safe above is 130 N, what is the magnitude (in N) of the friction force on the safe?

⨯ Think about Newton's second law. If the velocity is constant (it's zero and stays zero), what's the acceleration? What's the net force? From this, if you push with a force in one direction, what must be the magnitude of the static friction force in the other direction? N

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