Download Glossary for Chapter 5 Forces

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