Flashcards in Forces Deck (11):

1

## What is a vector?

### Vectors are quantities that are fully described by both magnitude and a direction

2

## What is a scalar?

### Scalars are quantities that are fully described by a magnitude alone.

3

## List 6 different scalar quantities.

###
Density

Temperature

Pressure

Potential difference

Frequency

Power

4

## List vector quantities.

###
Displacement

Velocity

Acceleration

Force

Momentum

Electric current

5

## Is weight scalar or vector.

### Vector - its direction is downwards

6

## Defintion of resultant forces

### overall force on a point or object

7

## Why is a resultant force needed?

### A resultant force is needed to change the velocity of an object.

8

## Resultant force equation

### Mass x Acceleration

9

## Centre of mass definition (1)

### the center of mass of a distribution of mass in space is the unique point where the weighted relative position of the distributed mass sums to zero

10

## Centre of mass definition (2)

### the point where if a force is applied it moves in the direction of the force without rotating

11