Energy can't be created or destroyed

Question 1

A sled slides down a snowy hill and its speed increases. Which statement best explains the change in the sled’s kinetic energy?

Accepted Answer

Energy is transferred from the hill to the sled.

Answer

Energy is destroyed in the sled as it speeds up.

Answer

Energy is transferred from the sled to the hill.

Answer

Energy is created inside the sled as it moves.

Question 2

A student rolls a metal ball down a smooth wooden ramp. As the ball reaches the bottom, its speed increases. Which of the following statements best explains the change in the ball’s kinetic energy?

Accepted Answer

The ball’s kinetic energy increased because gravitational potential energy was transferred to the ball as it moved down the ramp.

Answer

The ball’s kinetic energy increased because the ball’s mass changed during the roll.

Answer

The ball’s kinetic energy increased because the ball created new energy while moving.

Answer

The ball’s kinetic energy increased because friction added energy to the ball.

Question 3

During a science demonstration, a metal ball is dropped from a height of 2 meters onto a soft foam pad and comes to rest after a short bounce. Which statement best explains the change in the ball’s kinetic energy according to the law of conservation of energy?

Accepted Answer

The ball’s kinetic energy decreased because it was transferred to thermal energy and sound as the ball and pad deformed.

Answer

The ball’s kinetic energy decreased because the ball’s mass increased during the collision.

Answer

The ball’s kinetic energy decreased because new energy was created inside the ball during the impact.

Answer

The ball’s kinetic energy decreased because the energy vanished when the ball stopped moving.

Try three questions

A sled slides down a snowy hill and its speed increases. Which statement best explains the change in the sled’s kinetic energy?

A student rolls a metal ball down a smooth wooden ramp. As the ball reaches the bottom, its speed increases. Which of the following statements best explains the change in the ball’s kinetic energy?

During a science demonstration, a metal ball is dropped from a height of 2 meters onto a soft foam pad and comes to rest after a short bounce. Which statement best explains the change in the ball’s kinetic energy according to the law of conservation of energy?

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