Work and Energy

What is the best way to define work?

• applying a force for a period of time

• moving a certain distance

• applying a force over a distance

• applying a force at a given speed

The equation used to calculate for work when force is applied to move an object some distance is:

• work = force + distance

• work = force / distance

• work = distance / force

• work = force x distance

A lever rotates around a fixed point called a:

• ball bearing

• gear

• pulley

• fulcrum

Energy is measured in units of:

• newtons

• joules

• kg/m^2

• kg * m/s^2

Exercise may transform the chemical energy in the food you eat into :

• kinetic energy

• potential energy

• both kinetic and potential energy

• neither kinetic or potential energy

Potential energy is energy due to the:

• motion of an object

• height of an object

• temperature of an object

• speed of an object

Which of the following is a form of radiant energy?

• light

• gasoline

• sound

• batteries

What happens to the energy stored in oil when you use it to heat your house?

• it is used up

• it is destroyed

• it is converted to heat energy

• it stays exactly the same

When gasoline is used as fuel in an automobile engine several energy transformations take place. Which of the following statements does NOT agree with the law of conservation of energy?

• when gasoline is burned, its energy is destroyed

• the energy from the gasoline can be transformed to produce light

• as the energy in the the form of gasoline decreases, the energy increases in another form

• once the energy in the gasoline is released, it can never be destroyed

Which of the following is TRUE statement?

• electric power plants make energy

• once all the oil and gas on Earth is used up, all Earth's energy will be gone

• power plants convert other sources of energy into usable electrical energy

• every time you turn on a light, you destroy a little more of Earth's total energy