Where Energy Goes? Mechanical Energy

Open Ended

Explain the difference between kinetic energy and potential energy using examples from sports or daily life.

Multiple Choice

Which formula would you use to calculate the kinetic energy of a moving basketball?

• KE = ½mv²

• PE = mgh

• Efficiency = (Useful Energy Out ÷ Total Energy In) × 100%

• Force = ma

Fill in the Blank

A 1500 kg car is traveling at 20 m/s. What is its kinetic energy?

Multiple Select

Select all the correct statements about the law of conservation of energy.

• Energy can be created and destroyed.

• Total energy in a system remains constant.

• Energy can transform from one form to another.

• The total energy at the start always equals the total energy at the end.

Open Ended

Describe how energy transforms in a roller coaster from the top of the hill to the bottom.

Fill in the Blank

The efficiency of a gas car engine is ___%.

Open Ended

Explain how energy is transformed in your body when you perform a physical activity like dancing. Use the different types of energy mentioned in the lesson.

Multiple Choice

Which type of energy is stored in the food you eat and later transformed as you dance?

• Chemical energy

• Kinetic energy

• Thermal energy

• Mechanical energy

Multiple Select

According to the key takeaways, which of the following statements are true about energy?

• Energy can be transformed from one type to another.

• Friction always increases the efficiency of machines.

• The total amount of energy always stays the same.

• The best machines maximize useful energy output while minimizing waste.