Understanding Energy and Forces

What is the unit of energy in the International System of Units (SI)?

• Newton

• Joule

• Watt

• Pascal

Which type of energy is associated with an object due to its motion?

• Potential Energy

• Kinetic Energy

• Thermal Energy

• Chemical Energy

If a ball is thrown upwards, what happens to its kinetic energy as it reaches the highest point?

• It increases

• It decreases

• It remains the same

• It becomes zero

Which of the following best describes the law of conservation of energy?

• Energy can be created and destroyed

• Energy can be transformed from one form to another, but the total amount remains constant

• Energy is always lost as heat

• Energy is only found in living organisms

• 49 Joules

• 98 Joules

• 196 Joules

• 9.8 Joules

If a car is moving at a speed of 20 m/s and has a mass of 1000 kg, what is its kinetic energy?

• 200,000 Joules

• 400,000 Joules

• 100,000 Joules

• 800,000 Joules

Explain why a pendulum eventually stops swinging if energy is conserved.

• Energy is lost to the environment as heat due to air resistance and friction

• Energy is destroyed over time

• The pendulum loses mass

• The pendulum gains energy from the environment

A roller coaster car is at the top of a hill. Describe the energy transformation as it descends.

• Kinetic energy to potential energy

• Potential energy to kinetic energy

• Thermal energy to potential energy

• Chemical energy to kinetic energy

How does the concept of force relate to energy?

• Force is a type of energy

• Force is the rate at which energy is used

• Force can do work, which transfers energy

• Force is unrelated to energy

A 5 kg object is moving with a velocity of 10 m/s. Calculate its kinetic energy.

• 250 Joules

• 500 Joules

• 100 Joules

• 50 Joules