Save
Busy. Please wait.
Log in with Clever
or

Don't have an account?  Sign up
Sign up using Clever
or

taken

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below

Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size     Small Size show me how

# P1.2 - Work & Energy

### Work & Energy - OCR AS Physics

QuestionAnswer
Define work done: Work done = force x distance moved in the direction of the force
Define power: Work done per second.
What is the principle of conservation of energy? Energy cannot be created or destroyed. It can only be converted from one form to another.
How do you work out efficiency? Useful output/total input x 100%
What do sankey diagrams show? Energy input and output.
What does Hooke's law state? Extension is proportional to force.
What is the equation for hook's law? F = ke
When does hooke's law stop working? When the load is great enough, the elastic limit. If you increase the load past the elastic limit the material will be permanently deformed.
What is an elastic stretch? The material will return to it's original shape once the forces are removed.
What is a plastic stretch? The material will be permanently stretched.
A stress causes a ...... A stress causes a strain.
How do you work out the stress of an object? Force/Area
How do you work out the strain of an object? extension/original length
If af stress is big enough to break the material, what is it called? The Breaking Stress. The atoms are completely separated.
What is elastic strain energy? The energy stored in a stretched material. This is given by the area under a force-extension graph.
What equation gives the energy stored in as stretched wire? 1/2 x Force x extension OR 1/2 x k x extension^^2
How do you work out young's modulus? Stress/Strain. It is also equal to the area under a stress/strain graph.
What does the stress strain graph for a ductile material look like? It will curve.
What does the stress strain graph for a brittle material look like? It is a straight line so will not curve.
Rubber will return to it's original length when the load is removed, what is this behaviour called? Elastic Behaviour.
Created by: Sparksy

Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

• SPACEBAR - flip the current card
• LEFT ARROW - move card to the Don't know pile
• RIGHT ARROW - move card to Know pile
• BACKSPACE - undo the previous action

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
 "Know" box contains: Time elapsed: Retries:
restart all cards