Friction

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

• similar
• opposite
• parallel
• west

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

A type of friction that occurs when air pushes against a moving object causing it to decelerate.

• surface area
• air resistance
• velocity
• gravity 

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

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

 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

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

A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box? 

• 81 N
• 18 N
• 98 N
• 74 N

What are the units on the coefficient of friction?

• none
• Newtons
• meters
• kilograms

What is a friction force  acting on an NON- moving object.

• Static friction 
• Fuild friction 
• Rolling friction 
• Sliding Friction 

The mass of a brick is 5kg, and it is stationary. What is the maximum static friction if the coefficient is 0.66?

• 3.3

• 33

• 3.3N

• 33N