Section 5.2 Quizziz

A ball is rolling across a rough surface. What kind of friction is applicable in this case?

• Kinetic

• Static

• Both

• Interpersonal

A box required 150 N to start its motion and then 90 N to keep moving at a constant velocity. Which of the following statement explains why this is the case?

• The force of static friction is always less than kinetic friction.

• The coefficient of static friction is always more than kinetic friction for the same surfaces.

• The coefficient of kinetic friction is always more than static friction for the same surfaces

• The force of static friction is always greater than kinetic friction.

A 25 kg box is sitting on a surface with coefficient of static and kinetic friction of 0.125 and 0.075 respectively. What is the force of static friction acting on the box?

• 0 N

• 30.7 N

• 18.4 N

• 3.13 N

What is the minimum force required to move a 15 kg box on a surface with coefficient of static and kinetic friction of 0.375 and 0.250 respectively?

• 15.0 N

• 36.8 N

• 55.2 N

• 2.50 N

Which of the following objects would have the greatest force of kinetic friction if they have the same mass and same coefficient of kinetic friction?

• A box sliding at 2.50 m/s

• A sled being pulled at 3.75 m/s

• Mr. Phan sliding at 10.0 m/s while they're hating cause they're trying to catch him doing physics.

• They all have the same force of kinetic friction.