Turning Force, Centre of Gravity

Question 1

Lever

Answer 1

A lever is any rigid body which is free to turn about a fixed point called the fulcrum

Question 2

Examples of lever

Answer 2

Doors, door handles, pliers, scissors & metre sticks

Question 3

Centre of gravity

Answer 3

The centre of gravity is an object is the point through which all the weight of the object appears to act

Question 4

Stable equilibrium

Answer 4

Stable equilibrium is present if when an object is slightly tilted its centre of gravity is raised and it goes back to the original position on release

Question 5

Unstable equilibrium

Answer 5

Unstable equilibrium is present if when an object is slightly tilted its centre of gravity is lowered and it takes a new position when released

Question 6

Neutral equilibrium

Answer 6

Neutral equilibrium is present if when an object is moved its centre of gravity is neither raised nor lowered. The object never becomes unstable - it does not fall over and just takes up a new position where it is still in neutral equilibrium

Question 7

Moment

Answer 7

The moment of force is the turning effect of a force