Moments, Force And Levers

Question 1

Explain Moment of a force

Answer 1

How much spin or circular motion of a force can cause

Question 2

What is the formula for the moment of a force

Answer 2

Force x perpendicular distance from fulcrum to line of action of the force

Question 3

Explain fulcrum

Answer 3

The axis or fixed point at which a lever turns

Question 4

Explain a lever

Answer 4

A rigid body that can turn about a fixed point called a fulcrum

Question 5

Give three examples of everyday applications of the lever

Answer 5

Scissors
Wheelbarrow
Door handle

Question 6

State the law of the lever

Answer 6

When a lever is balanced the sum of the clockwise moments equals the sum of the anticlockwise moments

Question 7

Explain the experiment to verify the law of the lever

Answer 7

Suspend metre stick at 50cm(centre of gravity)
Hang a 2N weight at 20cm and a 4N weight at 65cm
Metre stick will balance horizontally because moment of anti-clockwise (2N weight/right side) equals the clockwise( 4N weight/left side)

2N x 30cm = 4N x 15cm

Question 8

Explain centre of gravity

Answer 8

A point in the object which all weight of the object appears to act

Question 9

Explain what equilibrium means

Answer 9

When an object is balanced or still it is in equilibrium

Question 10

When is something in stable equilibrium?

Answer 10

If object is pushed it will return to the same spot (U shape)

Question 11

When is something in unstable equilibrium?

Answer 11

If pushed object will fall or not be in equilibrium (n shape)

Question 12

When is something in neutral equilibrium?

Answer 12

If pushed object will not move too far and be balanced (flat)

Question 13

What does stability mean

Answer 13

Objects will not topple easily

Question 14

When will an item topple

Answer 14

If the weight of that object is acting through a centre of gravity

Question 15

How can you improve the stability of objects

Answer 15

Use a wide base and lower the centre of gravity