The Basics of Motion  Physics Paper 2
 Created by: YellowDude67
 Created on: 030919 17:37
Speed

Speed is a scalar quantity.

Scalar quantities only have a magnitude (size).

Scalar quantities, like speed, do not have a direction.
Vector

Velocity describes an object’s direction as well as its speed.

Velocity is a vector quantity because it has a magnitude (or size) and a direction.
Typical Speeds

Typical walking speed is 1.4m/s.

Typical running speed is 3.3m/s.

Typical speed of a bus in town is 10m/s.

Typical speed of a car on the motorway is 31m/s.

Typical speed of wind is 6m/s.

Typical speed of sound is 340m/s.
Adding Vectors

To add vectors, draw each vector as an arrow one after the other.

The length of the arrow represents the magnitude (size) of a quantity.

The direction of the arrow represents the direction of the vector quantity.

Vector Addition

Jane pushes a table with a force of 10N towards the door, but her brother, Frank tries to stop her by pushing it with a force of 10 N at a right angle to Jane.

The effect of these forces is shown above.

Pythagoras’ theorem is used to work out the resultant force.

Resultant Force = √(10…

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