# A dockworker loading crates on a ship finds that a 20.0 kg crate, initially at rest on a...

## Question:

A dockworker loading crates on a ship finds that a 20.0 kg crate, initially at rest on a horizontal surface, requires a 75.0 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60.0 N is required to keep it moving with a constant speed.

Find the coefficients of static and kinetic friction between crate and floor.

## Friction:

Friction is a force that resists the relative motion between two objects in contact with each other. The magnitude of this force depends on the nature of the two surfaces, the normal force and the area of contact.

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Static friction is the minimum force required to set a stationary object into motion. Kinetic friction is the force that tries to bring a moving...

Static Friction: Definition, Formula & Examples

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Chapter 11 / Lesson 21
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What is static friction? See static friction examples and learn the static friction formula. Compare static vs. kinetic friction and learn the differences.