Understanding Work Done by Friction

What happens to the kinetic energy lost due to friction?

• It is transformed into heat energy.

• It is converted into potential energy.

• It speeds up the object in the opposite direction.

• It disappears from the universe.

How is the work done by friction calculated?

• Kinetic energy divided by distance.

• Force of friction divided by distance.

• Force of friction times distance.

• Normal force times distance.

What is the primary purpose of using mu times the normal force in friction calculations?

• To simplify the calculation of distance.

• To eliminate the need for mass in equations.

• To calculate the speed of an object.

• To increase the accuracy of potential energy calculations.

In the box sliding example, what is the initial kinetic energy of the box?

• 125 Joules

• 150 Joules

• 50 Joules

• 100 Joules

In the moped hill example, what indicates that friction is present?

• The moped stops halfway down the hill.

• The final velocity is more than expected.

• The final velocity is less than expected.

• The moped speeds up at the bottom.

In the moped hill example, what is the height of the hill?

• 10 meters

• 5 meters

• 15 meters

• 20 meters

What is the coefficient of friction used in the taco sliding example?

• 0.1

• 0.2

• 0.4

• 0.3

In the phone example, what is the angle of the hill?

• 35 degrees

• 30 degrees

• 25 degrees

• 20 degrees

What is the initial velocity of the taco in the sliding example?

• 2 meters per second

• 3 meters per second

• 5 meters per second

• 4 meters per second

In the phone example, what is the distance the phone travels up the hill?

• 2 meters

• 5 meters

• 3 meters

• 4 meters