Mu Coefficient of Friction

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

• similar
• opposite
• parallel
• west

What are the units on the force due to friction?

• none
• Newtons
• meters
• kilograms

What are the units on the coefficient of friction (μ)?

• none

• Newtons

• meters

• kilograms

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 

You are being pulled on a sled to the left with 50N of force.  Friction is acting on the runners of the sled in the opposite direction with 5N of force.  What is the net force of the scenario? 

• 55N right 
• 45N left
• 25N left

Tags

NGSS.MS-PS2-2

A hockey puck slides on ice at a constant velocity. What is the net force acting on the puck?

• Zero
• Equal to its weight
• Less than its weight but greater than zero
• Depends on the speed of the puck

A hockey puck slides on ice at a constant velocity. Why doesn't the puck slow down?

• F_f = 0

• F_app > F_f

• F_app < F_f

• F_app > 0

Tags

NGSS.MS-PS2-2

 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

  A 220 Kg crate is pushed horizontally with a force of 700 N. If the coefficient of kinetic friction is 0.20, calculate the acceleration of the crate.   

• 1.02 m/s²
• 1.22 m/s²
• 1.42 m/s²
• 1.62 m/s²

Tags

NGSS.MS-PS2-2