1. Forces Glossary
The centre of gravity of an object is the point at which the weight of the object can be said to act.
© Mike Benn, Graham George 2016

2. Forces Glossary
Gravitational field strength is the force per unit mass on an object placed in a gravitational field.
© Mike Benn, Graham George 2016

3. Forces Glossary
The moment of a force is the product of the force and the perpendicular distance between the axis of rotation and the line of action of the force.
© Mike Benn, Graham George 2016

4. Forces Glossary
Newton’s first law of motion states that an object will remain in a state of rest or continue to move with a constant velocity unless acted upon by a resultant external force.
© Mike Benn, Graham George 2016

5. Forces Glossary
Newton’s second law of motion states that the resultant force exerted on a body is directly proportional to the rate of change of linear momentum of the body.
© Mike Benn, Graham George 2016

6. Forces Glossary
Newton’s second law of motion for fixed masses states that the
acceleration of a body of constant mass is proportional to the resultant force applied to it and in the direction of the resultant force.
© Mike Benn, Graham George 2016

7. Forces Glossary
Newton’s third law of motion states that if body A exerts a force on body B, body B will exert an equal and opposite force on body A.
© Mike Benn, Graham George 2016

8. Forces Glossary
The principle of moments states that if a system is in equilibrium, the sum of the clockwise moments must equal the sum of the anticlockwise moments.
© Mike Benn, Graham George 2016