Physics Definitions

Define 'Quantity'

• In S.I a quantity is represented by a number and a unit

• In S.I a quantity is represented by a direction and a unit

• In S.I a quantity is represented by a number and a direction

• In S.I a quantity is represented by a unit and a volume

A scalar is a quantity with only (a)  

A vector is a quantity with both...

• Magnitude

• Units

• Volume

• Direction

Density = (a)   / volume

Define the moments about a force

• The speed of a force
• The turning effect (torque) of a force

• The direction and magnitude of a force

• Turning effect produced by a force acting at a distance from a point or axis

The area under a velocity time graph is equal to the...

• time
• displacement
• acceleration
• speed

The principle of moments

• The principle of moments states that the sum of the clockwise moments about any point is less than the sum of the anticlockwise moments about the same point.
• The principle of moments states that the sum of the clockwise moments about any point is greater than the sum of the anticlockwise moments about the same point.
• The sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about the same point.
• The principle of moments states that the sum of the clockwise moments about any point is not related to the sum of the anticlockwise moments about the same point.

Define centre of gravity

• The point at which an object is in motion
• The point at which an object is heaviest
• The point at which an object is weightless
• The point at which the entire weight of an object can be considered to act

Diplacement is the (a)   distance from point A to point B

Mean speed =

• total distance / total time

• total displacement / total time

• total velocity / total time