Force of Friction = Mu x Normal Force

Static frictions depends on which of the following factors

• mass and velocity

• the coefficient of static friction, and the direct force on the object

• The velocity, and the direct force on the object

• the coefficient of static friction, and the normal force between the surfaces

A push or pull acting on an object is called a

• Work done

• Force

• Moment

• Momentum

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

If you were trying to quickly determine the static coefficient of friction, you'd raise the plank until the block just starts to slide and do what?

• tan theta = mu

• cos theta = mu

• sin theta = mu

• none of these is correct

Tags

NGSS.HS-PS2-1

• A measure of how much force is needed to move an object

• A measure of the roughness between two surfaces

• The force required to lift an object

• The gravitational pull on an object

• The force parallel to the surface

• The force perpendicular to the surface

• The gravitational force

• The applied force

Which of the following is true about the force of friction?

• It always acts in the direction of motion

• It is independent of the normal force

• It acts opposite to the direction of motion

• It is always greater than the applied force

If the coefficient of friction is 0.5 and the normal force is 10 N, what is the force of friction?

• 5 N

• 10 N

• 15 N

• 20 N

How does increasing the normal force affect the force of friction, assuming the coefficient of friction remains constant?

• It decreases the force of friction

• It increases the force of friction

• It has no effect on the force of friction

• It reverses the direction of the force of friction

Which of the following surfaces would likely have the highest coefficient of friction?

• Ice

• Glass

• Sandpaper

• Steel

What happens to the force of friction if the coefficient of friction is doubled?

• It is halved

• It remains the same

• It is doubled

• It is quadrupled