Levers and Pulleys

3. Which type of lever is this?

• First Class Lever
• Second Class Lever
• Third Class Lever

For a lever to be a first class lever the fulcrum needs to be ..

• between the load and the effort
• on one side and the load and effort on the other side 
• on the same side as the load arm. 

work is...

• energy from the sun
• a type of machine
• a force that moves an object
• a force that pulls you toward the earh

What two parts might make a pulley?

• wheel and axle
• wheel and wire
• wheel and screw
• wheel and fulcrum

The lifting arm on a crane uses a system of pulleys.  For every one newton of force put into the pulleys, four newtons of force come out.  This increase in force is called what?

• Mechanical advantage
• Friction
• Compound machine
• Compound advantage

Force X Distance = __________

• Energy
• Power
• Newtons
• Work

Which simple machine is used to raise or lower the flag seen in the picture below?

• lever
• fixed pulley
• screw
• moveable pulley

Which of the following decreases when an object is lifted using a movable pulley?

• The distance the object moved
• The amount of force needed
• The length of the pulley’s rope
• The pull of gravity on the object

The diagram provided shows a fixed pulley system.A fixed pulley does not change the amount of effort needed to lift the load, but it does change the 

• direction of the force.
• weight of the load.
• volume of the force.
• shape of the load.

The diagram provided shows a 50 N load attached to a movable pulley.What amount of force must act on the left rope of the pulley in order to lift the load?

• Less than 25 N
• 25 N
• 50 N
• More than 50 N