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Do you have a good conceptual understanding of friction?

Do you have a good conceptual understanding about friction? Answer the following multiple choice questions to find out. Read the feedback carefully to understand what you don't understand.

Which of the following has NO effect on the force of friction?

  1. the normal force
  2. the speed at which an object moves
  3. the surfaces in contact
  4. whether an object is moving

The force of friction depends on the force pressing the two surfaces together as well as the surfaces that are in contact with each other. The force of friction of a moving object is less than the force needed to start the object moving.

The force of friction depends on the force pressing the two surfaces together as well as the surfaces that are in contact with each other. The force of friction of a moving object is less than the force needed to start the object moving.

The force of friction depends on the force pressing the two surfaces together as well as the surfaces that are in contact with each other. The force of friction of a moving object is less than the force needed to start the object moving.

The force of friction depends on the force pressing the two surfaces together as well as the surfaces that are in contact with each other. The force of friction of a moving object is less than the force needed to start the object moving.

The rougher the two surfaces in contact are...

  1. the greater the coefficient of friction.
  2. the smaller the coefficient of friction.

A rough surface has more surface area and more "bumps" to create more bonds between the atoms.

A rough surface has more surface area and more "bumps" to create more bonds between the atoms.

If an object is moving at a constant speed, you can assume that...

  1. the applied force is the same as the friction force.
  2. the friction force is greater than the applied force.
  3. the applied force is greater than the friction force.

For an object to not accelerate, there has to be a zero net force.

For an object to not accelerate, there has to be a zero net force.

For an object to not accelerate, there has to be a zero net force.

Two objects are made of the same material are sitting on the same surface. If one object is 4 kg and the second is 8 kg, which has the greater force of static friction?

  1. the 4 kg object
  2. the 8 kg object
  3. both are the same
  4. there's not enough information to know

Since mass directly affects the normal force, the object with the greater mass will have a greater friction force.

Since mass directly affects the normal force, the object with the greater mass will have a greater friction force.

Since mass directly affects the normal force, the object with the greater mass will have a greater friction force.

Since mass directly affects the normal force, the object with the greater mass will have a greater friction force.

Summary

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