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Forces and Motion - Coggle Diagram
Forces and Motion
Newton's Second Law
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Acceleration is affected by the time, the initial speed and the final speed
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Resultant Forces
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The length of an arrow represents the MAGNITUDE of the vector
The direction is shown by the way it points
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To add forces, use the top to tail method
Balanced forces: the resultant force is zero so an object will remain stationary or travel at a constant velocity
Unbalanced forces: the resultant force is not zero and so the object will accelerate (either by changing speed, direction or both)
Newton's First Law
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A non-zero resultant force will cause an object to change speed, change direction or both
When an object travels in a circle, the direction is continuously changing meaning the the velocity is NOT constant. This means that the object is accelerating
There must be a force towards the centre of the circle to cause an object to continue travelling in a circle. This is called the CENTRIPETAL FORCE
Examples of centripetal force are;
- planets orbiting the sun
- spinning an object on a string above your head
- cars going round a bend in a race
Mass and Weight
Mass (kg): amount of matter - the same anywhere in the universe
Weight (N): force; depends on the gravity. This will change depending on location
Weight is determined by the mass of the object and its location (greater gravity gives a greater weight)
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