P2
- Created by: Ciera
- Created on: 18-03-13 18:25
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- Resultant force
- Zero resultant force
- When the resultant force is zero, the object remains stationary or carries on at the same speed and direction. If two forces only act on the object, they must be equal to each other and act in opposite directions.
- All the time, you have at least two forces acting on you- the force of gravity and the force that supports you. Most objects around you are acted on by more than one force and we can work out the effect of these forces on an object by replacing them with a single force- the resultant force.
- The resultant force is a single force that has the same effect as all the forces acting on an object.
- Non-zero resultant force
- When the resultant force on an object is not zero, the movement on the object depends on the size and direction of the resultant force.
- For example, when a car driver applies brakes, the braking force is greater than the force from the engine. The resultant force is the difference between the braking and engine forces. It acts in the opposite direction to the cars direction so slows the car down.
- If an object is acted on by two unequal forces acting in opposite directions, the resultant force is equal to the difference between the two forces and in the direction of the larger force.
- For example, when a car driver applies brakes, the braking force is greater than the force from the engine. The resultant force is the difference between the braking and engine forces. It acts in the opposite direction to the cars direction so slows the car down.
- When the resultant force on an object is not zero, the movement on the object depends on the size and direction of the resultant force.
- Zero resultant force
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