Kinetic Friction

____________ slows down a moving object.

• Kinetic Friction

  
  

• Static Friction

• Electric Force

A 2.4-kg block slides across a rough surface such that it slows down with an acceleration of 3 m/s². What is the coefficient of kinetic friction between the block and the surface?

• 0.407

• 0.2

• 0.306

A 4-kg block slides across a rough surface such that it slows down with an acceleration of 2 m/s². What is the coefficient of kinetic friction between the block and the

surface?

• 0.5

• 0.204

• 0.302

A 9 kg block slides across a rough surface such that it slows down with an acceleration of 8 m/s². What is the coefficient of kinetic friction between the block and the

surface?

• 0.81

• 0.7

• 0.6

A 3 kg block slides across a rough surface such that it slows down with an acceleration of 6.9 m/s². What is the coefficient of kinetic friction between the block and the

surface?

• 0.45

• 0.678

• 0.704

A 1.4 kg block slides across a rough surface such that it slows down with an acceleration of 1.25 m/s². What is the coefficient of kinetic friction between the block and the

surface?

• 0.9

• 0.127

• 0.5

A 12 kg block slides across a rough surface such that it slows down with an acceleration of 3.69 m/s². What is the coefficient of kinetic friction between the block and the

surface?

• 0.13

• 0.23

• 0.37

A 15 kg block slides across a rough surface such that it slows down with an acceleration of 4.7 m/s². What is the coefficient of kinetic friction between the block and the

surface?

• 0.47

• 0.24

• 0.7

The kinetic friction force is equal to the coefficient of kinetic friction ___________ normal force.

• Minus

• Times

• Divided by

A 3 kg box is pulled along a horizontal surface by a force F, so the box is moving at a constant velocity. If the coefficient kinetic friction is 0.1, determine the magnitude of the kinetic friction (g = 9.8 m/s²).

• 1.7 N

• 3.2 N

• 2.94 N