Cool Science

Which type of energy does an object not have if it is not moving?A)kinetic energy B)gravitational potential energy C)elastic potential energy D)chemical potential energy

A) Kinetic Energy

According to the law of conservation of energy, the total amount of energy in the universe ____. A)remains constant B)changes constantly C) increases D)decreases

A) Remains constant

Which would increase the kinetic energy of a wagon? Select all that apply.A)Add mass to the wagon.B)Decrease the mass of the wagon.C)Increase the speed of the wagon.D)Decrease the speed of the wagon.

A)Add mass to the wagon.C)Increase the speed of the wagon.

Which of the following does NOT reduce friction? A)grease B)cotton C) oil D)graphite

B) Cotton

Which has kinetic energy?A) a tank of gasoline B) a moving car C) a battery D)water in a reservoir

B) a moving car

Which indicates what happens to the kinetic energy when the mass of a moving object increases?A)The kinetic energy does not change.B)The kinetic energy increases by the same factor as the mass increase.C)The kinetic energy increases by the square of the same factor as the mass increase.D)The kinetic energy decreases by the same factor as the mass increase.

B)The kinetic energy increases by the same factor as the mass increase.

When two surfaces interact, some mechanical energy leaves the system as thermal energy due to ________.A)surrounding heat B)water C)friction D)fusion

C) friction

Work _____ energy.A) reduces B)reflects C)transfers D)stops

C) transfers

A dump truck, a sports car, and a bicycle are traveling at the same velocity. Which is true?A)They all have the same kinetic energy.B)The sports car has the most kinetic energy.C)The bicycle has the least kinetic energy.D)More information is needed to compare their kinetic energy.

C)The bicycle has the least kinetic energy.

Which indicates what happens to the kinetic energy of an object when its speed increases?A)The kinetic energy does not change.B)The kinetic energy increases by the same factor as the speed increase.C)The kinetic energy increases by the square of the same factor as the speed increase.D)The kinetic energy decreases by the same factor as the speed increase.Correct Answer

C)The kinetic energy increases by the square of the same factor as the speed increase.

Which equation is correct?A)mechanical energy = kinetic energy - potential energy B)mechanical energy = potential energy - kinetic energy C)mechanical energy = kinetic energy + potential energy D)mechanical energy = kinetic energy × potential energy

C)mechanical energy = kinetic energy + potential energy

In every energy transformation, some energy is always "lost" as ____ energy. A) chemical B) radiant C) electrical D)thermal

D) thermal

A compressed spring does not have elastic potential energy.

False

A rock at the edge of a cliff has kinetic energy because of its position.

False

According to the law of conservation of energy, energy can be created or destroyed.

False

As a car slows down, its kinetic energy increases

False

The energy that is stored as kinetic energy.

False

Moving a book to a lower shelf decreases its potential energy.

True

When you put on the brakes of a bicycle, friction causes some of the mechanical energy to transfer to thermal energy.

True

A stretched rubber band has what type of energy?

elastic potential energy

As mass decreases, kinetic energy increases.

false

If an object is on top of a hill or in a position raised above the ground, it must have __________.

gravitational potential energy

Which type or types of energy does a blimp circling above a sporting event have?

kinetic energy and gravitational potential energy

Differences in gravitational potential energy depend on an object's _________.

mass and height

Kinetic energy is the energy of_______.

motion

A kite stuck in a tree has ______ energy due to its position.

potential

A fire warms you by transferring ____________________ energy.

thermal