Physics Unit 2


See How it Moves

Average speed is calculated in m/s using:

Speed = Total distance travelled (M) divided by Time taken (S)

Distance time graphs show the distance an object moves in a period of time.

A line sloping up shows an object moving away from it target point, a line sloping down shows the target moving back.

The gradient shows the speed of the object.

Steep Gradient - Fast moving

Flat Gradient - Object Stopped

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Speed is Not Everything

Velocity is an objects speed in a given direction.

Acceleration (m/s2) = Change in velocity (m/s) divided by Time taken (s)

The change is velocity is:

Final velocity - Original velocity

Velocity time graphs can be used to show hom an objects velocity changes over time.

Steep gradient - Greater acceleration

Flat gradient - Steady speed

The area under a velocity time graph shows the distance travelled.

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Forcing It!

The resultant force on an object is the single force that would make an object move in exactly the same way as all the original forces together.

Forces in the same direction add. Forces in the opposite direction subtract.

If there is no resultant force, objects are balanced. They will not move.

If there is a resultant force, stationary objects begin to move.

If the resultant force is in the opposite direction, the object will decelerate.

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