Force that opposes motion between 2 surfaces

• force
• Newton
• friction
• net force

Which of the following is an example of friction that is harmful?

• Pencil marking on paper
• Engine parts wearing out
• sand placed on ice in the winter
• Using an eraser to erase marks

Friction is a force that acts in an ___________ direction of movement.

• similar
• opposite
• parallel
• west

Rougher surfaces have ...

• greater friction
• less friction
• the same level of friction

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N? 

• 0.78
• 0.51
• 0.78 N
• 0.58 N

 What is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12? 

• 65 N
• 226 N
• 175 N
• 114 N

• Increases

• Decreases

• Stays the Same

• Depends on the mass of the object

Weight=100N, Force_friction=20N

• μ=5.0

• μ=0.2

• μ=1.2

• μ=0.1

A force of attraction between objects that is due to their masses.

• Force
• Gravity
• Gravitational Pull
• Weight

The force of gravity (mass x gravity) is also known as...

• mass

• weight

• distance

• acceleration