Kinetic and Potential Energy in Action

Mr. Anderson explains kinetic and potential energy, using a wrecking ball and a skateboarder as examples. He discusses energy conservation in closed systems and demonstrates energy conversion through a simulation. The video also covers the impact of friction on energy and provides calculations for potential and kinetic energy, including speed determination.

What type of energy is associated with the motion of an object?

• Chemical energy

• Potential energy

• Thermal energy

• Kinetic energy

In a closed system, what happens to the total internal energy?

• It remains constant

• It decreases

• It fluctuates randomly

• It increases

What happens to potential energy as a skateboarder moves down a ramp?

• It increases

• It remains constant

• It decreases

• It turns into thermal energy

How does increasing the coefficient of friction affect the skateboarder's motion?

• Makes the skateboarder fly off the ramp

• Has no effect

• Decreases speed

• Increases speed

Which factor is NOT needed to calculate the potential energy of an object?

• Gravitational field strength

• Height of the object

• Color of the object

• Mass of the object

What is the gravitational field strength used in the potential energy calculation?

• 8.9 m/s²

• 10 m/s²

• 9.0 m/s²

• 9.8 m/s²

If a skateboarder has 5900 J of potential energy at the top of a ramp, what is the kinetic energy at the bottom?

• 2950 J

• 0 J

• 5900 J

• 11800 J

What is the formula for calculating kinetic energy?

• 1/2 mv²

• mgh

• mgΔy

• mv

What is the speed of the skateboarder at the bottom of the ramp if all potential energy is converted to kinetic energy?

• 15 m/s

• 13 m/s

• 20 m/s

• 10 m/s

What happens to the skateboarder if the system is not closed and energy is lost?

• The skateboarder slows down

• The skateboarder gains energy

• The skateboarder speeds up

• The skateboarder maintains speed