Energy Transformations — Quiz

Question 1

What is the sequence of energy transformations associated with a hydroelectric dam?

Revolt · Accepted Answer

gravitational potential energy into kinetic energy into mechanical energy into electrical energy

Question 2

A bird has a kinetic energy of 3 J and a potential energy of 25 J. What is the mechanical energy of the bird?

Revolt · Accepted Answer

28 J, because mechanical energy is the sum of the potential energy and kinetic energy

Question 3

A toy plane has a mass of 2 point 5 kilograms and is 18 m above the ground. It is moving at 4.5 meters per second How much mechanical energy does the toy plane have?

Revolt · Accepted Answer

466 cap j

Question 4

Which energy transformations occur when a candle burns?

Revolt · Accepted Answer

Chemical energy transforms into thermal energy and radiant energy.

Question 5

What energy transformation occurs when a skydiver first jumps from a plane?

Revolt · Accepted Answer

Gravitational potential energy transforms into kinetic energy.

Question 6

Which equation shows the correct relationship between mechanical energy, kinetic energy, and potential energy?

Revolt · Accepted Answer

ME is equal to KE plus PE

Question 7

Rita throws a ball straight up into the air and catches it at the same position from which she threw it. The ball has 18 J of mechanical energy when it leaves her hand. If no energy is lost due to friction, which statements about the energy of the ball are true? Choose four correct answers.

Revolt · Accepted Answer

The total mechanical energy of the ball stays constant.; The kinetic energy decreases as the potential energy increases.; The kinetic energy increases as the potential energy decreases.; The potential energy at the top of the ball’s motion is 18 J.

Question 8

A baseball has a mass of 0 point 1 4 5 kilograms and is 12 m above the ground. If it has a mechanical energy of 105 point 8 cap j , how fast is it moving?

Revolt · Accepted Answer

35 meters per second

Question 9

Which best describes how energy changes form in a car’s engine?

Revolt · Accepted Answer

Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy.

Question 10

Rita throws a ball straight up into the air and catches it at the same position from which she threw it. The ball has 18 J of mechanical energy when it leaves her hand. If no energy is lost due to friction, which statements about the energy of the ball are true? Choose four correct answers.

Revolt · Accepted Answer

The total mechanical energy of the ball stays constant.; The kinetic energy increases as the potential energy decreases.; The kinetic energy decreases as the potential energy increases.; The potential energy at the top of the ball’s motion is 18 J.

Energy Transformations — Quiz Answers

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