Friction Quiz Review Questions

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

What are the units on the coefficient of friction?

• none
• Newtons
• meters
• kilograms

Normal force is

• Always opposite the weight

• Always parallel and down the incline

• Always perpendicular to the surface

• It depends on the direction of motion

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

• True
• False

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

When looking at friction problems, if the net force in the x-direction on an object is zero, what can we say about its acceleration?

• it is positive

• it is negative

• it is zero

• not enough information is given

Tags

NGSS.HS-PS2-1

What does the strength of the force depend on? Check the answers that apply.

• The types of surfaces

• The weather

• How hard the surfaces push together

• motion

Tags

NGSS.MS-PS2-2

How does the weight of an object affect the force of friction?

• The force of friction is not affected by the weight of the object.

• The force of friction remains constant regardless of the weight of the object.

• The force of friction decreases with the weight of the object.

• The force of friction increases with the weight of the object.

What is the relationship between the normal force and the force of friction?

• The force of friction is directly proportional to the normal force.

• The force of friction is inversely proportional to the normal force.

• The force of friction is not related to the normal force.

• The force of friction is equal to the square of the normal force.