# A1 Motion, mass, and forces

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Lin YC
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A1 Motion, mass, and forces by

1.1.1. m/s

1.2.1. m/s

1.2.1.1. Vector

## 2. Weight and g

2.1.1. Newton(N)

2.2.1. Kg

2.3.1. g

2.3.1.1. 10N/kg

### 2.4. acceleration

2.4.1. weight/mass=10ms-2

2.4.1.1. g

2.4.1.1.1. acceleration of free fall

### 2.5. F=ma

2.5.1. Force=weight

3.1.1. kgm-3

## 4. Pressure

### 4.1. pressure=force/area

4.1.1. pascal(Pa)

### 4.2. liquids and gases are fluids

4.2.1. pressure acts in all directions

4.2.2. force produced is always at right-angles to the surface under pressure

4.2.3. pressure increase with depth

## 6. Displacement

### 6.2. Vectors

6.2.1. Both magnitude and direction

7.1.1. ms-2

7.1.1.1. Vector

## 8. Force

### 8.3. If 2 or more forces act on something, their combined effect

8.3.1. Resultant force

8.3.1.1. balanced=0

8.3.1.1.1. acceleration is 0

### 8.4. resultant force=massxacceleration

8.4.1. F=ma

8.4.1.1. more mass,more force is needed to produce any given acceleration

## 9. Moments and balance

### 9.1. turning effect of a force is moment

9.1.1. moment of force=force x perpendicular distance from point

9.1.1.1. distance=line of action of the force

### 9.2. balance=anticlockwise moment=clockwise moment

9.2.1. total weight=single force acting on Centre of gravity(CG)