GCSE PHYSICS UNIT 3 NOTES

GCSE PHYSICS CARDS TO LEARN FROM

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  • Created by: Diamanti
  • Created on: 21-05-11 11:02

Stability

Lets use the example of a bus, 

When the LINE OF ACTION is beyond the pivot there will be clockwise moment and the bus will topple over.

(SEE EXAMPLE PICTURE ON NEXT CARD)

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The LINE OF ACTION is the straight line that comes down from the centre of mass 

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Centripetal Force

Centripetal force causes acceleration. It's always to the centre of the circle.

(http://www.sciencecontrol.com/wp-content/uploads/2011/04/Centripetal-Force.gif)

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Centripetal Force

CENTRIPETAL FORCE INCREASE IF :

  • MASS IS INCREASED
  • SPEED IS INCREASED
  • RADIUS IS DECREASED
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GRAVITY IN SPACE

GRAVITY DECREASES WITH DISTANCE

IF YOU DOUBLE THE DISTANCE, THE FORCE OF GRAVITY DECREASES BY 4 TIMES.

THIS IS CALLED AN INVERSE SQUARE LAW

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ORBIT

Orbits tend to be a slightly squashed circle called and ELLIPSE

(http://www.astronomyforbeginners.com/images/diagrams/ellipse_orbit.gif)

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