# Physics Hinesh

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- Created by: Hinesh Maisuria
- Created on: 10-05-12 19:12

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- Motion.
- The distance-time graph for any object that is - stationary is a horizontal line - moving at constant speed is a straight line that slopes upwards.
- The gradient of a distance-time graph for an object represents the object's speed.
- Speed in metres per second, m/s = distance travelled in metres, m / time taken in seconds, s.
- Velocity is speed in a given direction.
- Acceleration is change of velocity per second. The unit of acceleration is the metre per second squared (m/s2).
- Acceleration = change of velocity / time taken.
- Deceleration is the change of velocity per second when an object slows down.
- If a velocity-time graph is a horizontal line, the acceleration is zero.
- The gradient of the line on a velocity-time graph represents acceleration.
- The area under the line on a velocity-time graph represents distance travelled.
- The speed of an object is given by the gradient of the line on its distance-time graph.
- The acceleration of an object is given by the gradient of the line on its velocity-time graph.
- The distance travelled by an object is given by the area under the line of its velocity-time graph.
- Forces.
- A force can change the shape of an object or change its motion or its state of rest.
- The unit of force is the newton (N).
- When two objects interact, they always exert equal and opposite forces on each other.
- The resultant force is a single force that has the same effect as all the forces acting on an object.
- If the resultant force on an object is zero, the object stays at rest or at constant velocity. If the resultant force on an…

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