Kinetic and Static Friction

When an object is moving at constant velocity, the net force acting on it is:

• zero N

• 4 N

• 9.8 N

• 5.25 N

Tags

NGSS.HS-PS2-1

If a bowl is sliding across a table at a constant velocity, the force of kinetic friction (F_k) equals:

• the applied force (F_applied)

• the normal force (F_n)

• the net force (F_net)

• the force of static friction

the force of kinetic friction (F_k) = ?

• the normal force (F_n) multiplied by the coefficient of kinetic friction

• the normal force (F_n) divided by the coefficient of kinetic friction

• the normal force (F_n) multiplied by the coefficient of static friction

• mass x gravity

the maximum force of static friction (F_s,max) = ?

• the normal force (F_n) multiplied by the coefficient of kinetic friction

• the normal force (F_n) divided by the coefficient of static friction

• the normal force (F_n) multiplied by the coefficient of static friction

• mass x gravity

the normal force (F_n) of a dog sleeping on a couch = ?

• the dog's mass multiplied by the force of gravity

• the couch's mass multiplied by the force of gravity

• the dog's mass divided by the force of gravity

• the couch's mass divided by the force of gravity

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A 20 kg minifridge resting on the floor requires a 120 N horizontal force to move it from rest. What is the coefficient of static friction between the minifridge and the floor?

• 0.61

• 0.51

• 0.49

• 0.69

Tags

NGSS.HS-PS2-1

A 44 kg desk resting on the floor requires a 99 N horizontal force to move it from rest. What is the coefficient of static friction between the desk and the floor?

• 0.23

• 0.53

• 0.49

• 0.36

Tags

NGSS.HS-PS2-1

The coefficient of static friction between a television and oak table is 0.4. If the television's mass is 30 kg, how much force is required to begin moving the television to the left?

• 117.6 N

• 92.1 n

• 143 N

• 75.7 N

The coefficient of static friction between a microwave and countertop is 0.77. If the microwave's mass is 15 kg, how much force is required to move the microwave from rest?

• 113.2 N

• 102.1 n

• 43.8 N

• 77.7 N

Tags

NGSS.HS-PS2-1

A hockey puck is sliding across the ice. If the coefficient of kinetic friction between puck and ice is 0.12, and the puck has a mass of 1 kg, how much force must be applied to the puck for it to slide at a constant velocity across the ice?

• 1.2 N

• 2.2 N

• 0.2 N

• 4.8 N

Tags

NGSS.HS-PS2-1