FRICTION QUIZ

True or False: Friction is the force between two moving surfaces that are touching.

• True

• False

Which type of friction occurs when objects are not moving?

• static
• sliding
• fluid
• rolling

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

• similar

• opposite

• parallel

• perpendicular

How can friction be reduced?

• Reduce the force acting between the two surfaces.

• Reduce the roughness of the two surfaces coming in contact.

• Use wax, grease, or oil.

• All of the above are ways of reducing friction.

The amount of friction depends on the weight of the objects pressing together.

• True
• False

If an object is at rest on an inclined plane, which of the following forces is greatest?

• normal force

• friction

• weight

• Both normal force and weight are equal, so they both are the greatest.

Tags

NGSS.HS-PS2-1

What are the units on the coefficient of friction?

• none
• Newtons
• meters
• kilograms

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

• 65 N

• 226 N

• 175 N

• 114 N

Tags

NGSS.HS-PS2-1

What is the coefficient of static friction if it takes 44 N of force to move an 86-N box on a horizontal surface?

• 0.78

• 0.51

• 0.78 N

• 0.58 N

Tags

NGSS.HS-PS2-1

Friction is a __________

• Contact force

• Non-contact force

• Magnetic force

• Electric force