Chapter 4 test; "Work and energy"

33 terms by alexisskye

Create a new folder

Advertisement Upgrade to remove ads

Energy does not have to involve motion

True

Energy is the ability to cause a change

True

Energy is the ability to cause change

True

when you ride a playground sing, your potential energy is greatest at the highest point

True

Chemical energy travels from the sun to Earth and is transformed into light energy by plants

False

As mass decreases. kinetic energy increases

False

Lowering an object decreases its potential energy

True

In a car engine, buring fuel produses heat. which causes gases to expand. producing kinetic energy

False

The sum of potential and kinetic energy in a system is called the total energy

False

As an object falls its potential energy is lost to the air around it

True

Carbohydrates and fats provide our bodies with energy in the form of calories

True

Energy from the sun and energy from food are just different forms of the same thing

True

Under certain conditions it is possible to get more work out of a machine than you put into it

True

Some machines do not multiply the force that is applied to them

True

In order for qork to be done on an object the object must move

True

Power equals work myltiplied by time

False

Mechandical advantage is always greater than 1

False

Energy cannot be changed from one variety to another

False

Gravitational potential energy is proportional to both mass and height above a reference lever

True

A stretched bow and a compressed rubber ball both possess elastic potential energy

True

The kinetic energy of an object increases as its ___ increases

Mass

Invresing the speed of an object __ Its potential energy

Decreases

The SI unit for energy is the ____

Joule

You can calculate kinetic energy by using the equasion

M*V2 / 2

You can calculate gravitational potential energy by using the equasion ____

MH.8 m/s2

A bus engine transgers chemical potential energy into ____ so that the bus moves

Kinetic energy

According to the law of conservation on energy, the total amount of energy in the universe ____________

Does not change

A device that does work with only one movement and changes the suze or direction of a force is a ____

Machine

The amount by which a machine multiplies an effort force is called the ______

Mechanical energy

When two or more simple machines work together, they are called _________

Compound machine

Unit of power is the _____

Watt

Machines make tasks easier by changing either the magnitude or the direction of the _______ needed

Force

At what point is a rollercoasters GPE the lowest?

Closest to the ground

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set