Changes In Speed
- Forces can cause objects to move faster or slower. That is, forces can cause either an increase in speed or a decrease in speed.
- An increase in speed is known as acceleration.
- This may involve an object that is initially stationary (not moving) or an object that is already moving.
- If you jump out of a plane, you will fall with increasing speed.
- If you start pedalling harder when riding your bike, your speed will increase.
- A decrease in speed is known as deceleration.
- If the force causing the deceleration continues for long enough, it will cause the object to stop moving.
- If a rolling ball approaches an upwards slope, its speed will decrease.
- If you apply the brakes on your bike, your speed will decrease. If you keep applying your brakes, you will eventually come to a stop.
Forces can cause an increase in speed, known as acceleration, or a decrease in speed, known as deceleration.
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