Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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.
We do not share your email address with others. It is only used to allow you to reset your password. For details read 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.
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards
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

speeding up revision

physics speeding up revision made from nzqa questions- ncea level1?

QuestionAnswer
In the first three seconds Mary’s acceleration is constant. Use the slope of the graph to calculate its size in meters per second squared. Slope of graph gives acceleration. Hence: a = 30ms-1/3s = 10 ms-2
to find time you? distance/speed
to find speed you? distance/time
to find distance you? time x speed
Using Newton’s Second Law, explain why the sky diver must have no net force acting on her when she is falling at a constant velocity? The net force on her is zero Newtons at her constant terminal velocity because she has no net acceleration. Hence by Newton’s second law, if anet = 0, then Fnet = m anet = 0 N.
Mary has a mass of 65 kg. Calculate the size of the force of gravity acting on her as she falls. F = mg = 65kg x 10 N/kg = 650 N
terminal velocity -drag and weight balanced -no accelerations; a=0 -at fastest possible speed -constant speed -zero change in speed, zero slope, zero acceleration -F=m,a. if a=0 f=0; weight less
at slope= ------- as constant acceleration
vt slope= acceleration/changing speed; no slope no acceleration= constant speed
dt slope= speed/velocity, more slope speed; no slope no acceleration = constant speed
Created by: Ella.scopas