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P2.1.1 - AQA GCSE Physics Unit 2
P2.1.1 |
Resultant forces |
a) Whenever two objects interact, the forces they exert on each other are equal and opposite. |
This is Newton's Third Law of Motion |
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b) A number of forces acting at a point may be replaced by a single force that has the same effect on the motion as the original forces all acting together. This single force is called the resultant force. |
Candidates should be able to determine the resultant of opposite or parallel forces acting in a straight line.
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c) A resultant force acting on an object may cause a change in its state of rest or motion. |
This is Newton's First Law of Motion |
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d) If the resultant force acting on a stationary object is:
■ zero, the object will remain stationary
■ not zero, the object will accelerate in the direction of the resultant force. |
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e) If the resultant force acting on a moving object is:
■ zero, the object will continue to move at the same speed and in the same direction
■ not zero, the object will accelerate in the direction of the resultant force. |
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