Activity 1

Levers are divided into three classes according to the relative situation of the fulcrum, the load and the force. Look at the pictures and answer the questions below.

1. In a first class lever...

a) the load is situated between the fulcrum and the force.

b) the fulcrum is situated between the force and the load.

c) the force is situated between the load and the fulcrum.

2. In a first class lever…

a) the force arm is never smaller than the load arm.

b) the force arm is never bigger than the load arm.

c) the force arm can be bigger, equal to or smaller than the load arm

3. In a first class lever…

a) the mechanical advantage could be bigger than 1, smaller than 1 or 1.

b) the mechanical advantage is never bigger than 1.

c) the mechanical advantage is never smaller than 1.

4. With a first class lever we can…

a) multiply just distance and speed.

b) multiply force or distance and speed.

c) multiply just force.

1. In a second class lever…

a) the load is situated between the fulcrum and the force.

b) the fulcrum is situated between the force and the load.

c) the force is situated between the load and the fulcrum.

2. In a second class lever…

a) the force arm is never smaller than the load arm.

b) the force arm is never bigger than the load arm.

c) the force arm can be bigger, equal to or smaller than the load arm

3. In a second class lever…

a) the mechanical advantage could be bigger than 1, smaller than 1 or 1.

b) the mechanical advantage is never bigger than 1.

c) the mechanical advantage is never smaller than 1.

4. With a second class lever we can…

a) multiply just distance and speed.

b) multiply force or distance and speed.

c) multiply just force.

1. In a third class lever…

a) the load is situated between the fulcrum and the force.

b) the fulcrum is situated between the force and the load.

c) the force is situated between the load and the fulcrum.

2. In a third class lever…

a) the force arm is never smaller than the load arm.

b) the force arm is never bigger than the load arm.

c) the force arm can be bigger, equal to or smaller than the load arm.

3.In a third class lever…

a) the mechanical advantage could be bigger than 1, smaller than 1 or 1.

b) the mechanical advantage is never bigger than 1.

c) the mechanical advantage is never smaller than 1.

4. With a third class lever we can…

a) multiply just distance and speed.

b) multiply force or distance and speed.

c) multiply just force.