Energy Transformation

What are the two main types of energyf

• radiant and chemical

• thermal and radiant

• potential and chemical

• kinetic and potential

Which activity directly converts energy from the Sun into chemical energy?

• a snake lying on a sunny rock to keep warm

• a rabbit using energy from food it has eaten to run

• a bean plant making its own food to grow

• a person burning firewood to cook food

The image shows a dam. Which descriptions best fit the labels?

• X Kinetic Energy Y Potential Energy

• X Potential Energy Y Kinetic Energy

• X mechanical energy Y electrical energy

• X electrical energy Y mechanical energy

The human body stores chemical energy from digested food. Some of the chemical energy is converted into mechanical energy when the body moves. Which statement is best supported by this information?

• The body does not convert chemical energy to thermal energy

• The body does not convert chemical energy to kinetic energy

• Digested food is a source of potential energy

Plants are responsible for a very important energy transformation, as shown. Which energy transformation does the picture best illustrate?

• radiant to chemical

• nuclear to mechanical

• chemical to thermal

Solar-powered cars use energy from the Sun to work. A panel on the car absorbs light energy from the Sun, which then generates an electric current. This electric current, in turn, allows the car to move. Which shows the correct order of energy transformations that take place in a solar-powered car?

• electrical, chemical, kinetic

• electrical, kinetic, radiant

• radiant, electrical, mechanical

During nuclear fission and fusion, what is the matter that seems to disappear actually converted into?

• mass

• energy

• volume

The diagram shows a swinging pendulum. Which best explains what happens to the motion of the pendulum due to the law of conservation of energy?

• The mechanical energy transforms to thermal energy as the pendulum slows and eventually stops moving

• The mechanical energy disappears as the pendulum slows and eventually stops moving.

• The pendulum will continue moving at the same speed until someone stops it because energy cannot be destroyed

Taro stated that when someone hits a golf ball with a club, the amount of energy the ball has changes, the amount of energy that the club has changes, and the total energy of the system that includes the ball and the club increases. Which best explains Taro’s error?

• The amount of energy that the ball has does not change

• The amount of energy that the club has does not change

• the total energy of the system remains the same

What happens in terms of energy when a moving car hits a parked car, causing the parked car to move?

• the moving car transfers kinetic energy to the parked car

• kinetic energy in the moving car disappears

• kinetic energy in the parked car is created