Speed can be worked out if you know:
- The distance travelled.
- The time taken to travel that distance.
- Speed (m/s) = Distance (M)/ Time (S)
- Their average speed can be calculated from the total distance and total time taken.
- Their speed at any one time is called the instantaneous speed.
- If we indicate the direction something is traveling in we can use positive distance and negative distance.
- Velocity and speed both tell us how fast something is moving, but velocity also takes account of direction.
- If we say that an object is moving away from the staring point, we say that it has a positive velocity.
- Then it has negative velocity when it travels back down.
- Forces arise when objects interact with each other.
- The size of the force is measured in Newtons.
- If you apply force on an object, the object with apply a force back on you.
- This is called the Reaction Force.
- Forces always act in pairs like this.
- Friction is a force that opposes motion.
- Lubricants such as oil are often used to reduce friction.
- Forces can…
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