Turning Forces, Centre Of Gravity

Question 1

Examples of levers

Answer 1

Door, door handles, pliers, scissors, metre stick, screwdriver,

Question 2

Law of the Lever

Answer 2

States that when a lever e.g meter stick is balanced, the total clockwise moments equal the total anticlockwise moments

Question 3

Centre of Gravity

Answer 3

The point through which all weight of the object appears to act

Question 4

Stable equilibrium

Answer 4

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

Is present if when an object is slightly tilted, its centre of gravity is lowered and it takes a new position when released falls over on its side

Question 6

Neutral equilibrium

Answer 6

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 a neutral equilibrium

Question 7

Moment

Answer 7

The turning effect of a force

Moment = (Force)x (Distance from the fulcrum)