What is the basic advantage of a single fixed pulley?

The pulley changes the direction of the effort force.

Using an inclined plane allows you to apply _____________?

lesser force

What are the two kinds of pulleys?

moveable and fixed.

A screw and a wedge are both similar to what other kind of simple machine?

an inclined plane.

A pulley makes work easier by changing the magnitude and/or  _______________ of the effort force required to do work.

Wheels ____________   friction

Machines are labor-saving devices because they decrease effort forces.  Machines do not do __________ work.

On what point does a lever pivot?

the fulcrum     

What is the term used for the force you
applied to a machine?

effort force

What is transferred when work is done?

Energy

When do you need less force when using a lever?

when the load and fulcrum are close together.

The ax blade is a wedge that has two __________?

inclined planes

What is the basic principle of using a lever?

You exert a small force over a long distance

A stapler is an example of which class of lever?

2nd Class  

see-saw

scissors

crowbar

hammer's claws

pliers

bottle opener

wheel barrow

paper cutter

stapler

door

baseball bat

fishing rod

shovel

tweezers

broom

golf club

shovel

arms and legs

The wheel and axle is most closely related to?

lever

A 8N mass is placed 0.4 meters from the fulcrum.  Where would you have to place a 4N mass in
      order for the lever to balance? Explain

0.8 N

8N x 0.4 m = 3.2 Nm

4N x ? = 3.2 Nm

Both sides have to have the same product.

Work = Work

Incline planes do not reduce work,
they reduce the ________force.

Effort force and effort distance are _____________  proportional.

A pulley makes work easier by changing the magnitude and/or
                                                              _______________ of the effort force required to do work.

A lever is balanced when the magnitude of torque on the left lever arm equals the magnitude of   ___________  on the right lever arm.

On a lever, torque is the product of an applied force and the_____________ of its lever arm.

Suppose you must lift a 150-kg box to a table 2 m high. How does the use of an inclined plane affect the amount of work you must perform to lift the box?

An inclined plane does not change the amount of work you must perform.

Which uses less force rolling or sliding friction?

 rolling

What does a screw consist of?

an inclined plane wrapped around a cylinder