# Forces definitions Flashcards

1
Q

Definition of Mass

A

Mass is defined as the amount of matter in an object and is measured in kilograms

2
Q

Definition of Weight

A

Weight is defined as the force acting on an object due to the pull of gravity and is measured in Newtons

3
Q

Definition of Friction

A

Friction is the force which opposes motion

4
Q

Newton’s first law

A

Newton’s first law states: an object will remain at rest or continue in uniform motion unless acted on by a resultant force.

5
Q

Newton’s second law

A

When an object is acted upon by a resultant force it will accelerate in the direction of the resultant force. The size of the acceleration is proportional to the resultant force and inversely proportional to the mass.

6
Q

Hooke’s law

A

The extension of the spring is directly proportional to the load applied provided the limit of proportionality is not exceeded.

7
Q

Centre of gravity

A

The point on an object through which all of its weight appears to act.

8
Q

Conditions of stability.

A

An object is stable if the vertical line from the centre of gravity falls inside its base.

9
Q

Moments

A

The product of the force and its perpendicular distance from the pivot.

10
Q

Principle of moments

A

When an object in equilibrium the sum of the clockwise moments must be equal to the sum of the anticlockwise moments about the same pivot.