Friction Coefficient Quiz

If a crate is slid across a surface with a kinetic friction force of 45 N, and the coefficient of kinetic friction is 0.75, what is the magnitude of the normal force?

• 30 N

• 60 N

• 60

• 90 N

Tags

NGSS.HS-PS2-1

In a physics experiment, a student finds that the kinetic friction coefficient between two materials is 0.3. If the normal force is doubled, how does the kinetic friction force change?

• It remains the same

• It is halved

• It is doubled

• It is quadrupled

• Newtons (N)

• Kilograms (kg)

• It is a dimensionless quantity (does not include them)

A box is being pushed across a wooden floor with a kinetic friction coefficient of 0.2. If the normal force on the box is 200 N, what is the kinetic frictional force acting on the box?

• 4 N

• 40 N

• 400 N

• 0.4 N

• 29 N

• 9.8 N

• 30 N

• 3 N

Tags

NGSS.HS-PS2-1

What is the kinetic frictional force if a 5 kg block is moving across a surface with a kinetic friction coefficient of 0.3 and the normal force is 49 N?

• 14.7 N

• 4.9 N

• 147 N

• 0.3 N

Tags

NGSS.HS-PS2-1

A truck is driving on a highway with a kinetic friction coefficient of 0.5 and the normal force exerted by the truck is 15000 N. Calculate the kinetic frictional force acting on the truck.

• 7500 N

• 1500 N

• 750 N

• 15000 N

Tags

NGSS.HS-PS2-1

If the coefficient of static friction between a box and the ground is 0.4, and the normal force exerted on the box is 200 N, what is the maximum static friction force that can act on the box?

• 80 N

• 40 N

• 200 N

• 100 N

Imagine you're trying to push a heavy box across a wooden floor. If the coefficient of kinetic friction between the box and the floor is 0.2 and you're applying a normal force of 100 N to keep the box in place, what is the kinetic frictional force acting on the box?

• 20 N

• 2 N

• 200 N

• 0.2 N

Tags

NGSS.HS-PS2-1

A box weighing 2000. N is sliding across a cement floor. The force pushing the box is 450. N, and the coefficient of sliding friction between the box and the floor is 0.20. What is the acceleration of the box?

• 450

• .45

• 4.4

• .25

Tags

NGSS.HS-PS2-1