Simple Machines

If an object is too heavy to move up a ramp, what is the best way to fix the problem?

• Increase the slope of the ramp
• Increase the elevation of the ramp
• Increase the length of the ramp
• Increase the friction of the ramp

Simple machines (crow bar, ramp, axe, screw, crane) do which of the following?

• Reduce the mass of an object that needs to be moved
• Reduce the distance an object needs to be moved
• Reduce the amount of time needed to move an object over a distance
• Reduce the force needed to move an object over a distance

A fixed pulley does work by 

• changing the size of the object it is pulling
• changing the distance of the object it is moving
• changing the direction of the force in relation to the object being moved

What two things make up a pulley?

• A wheel and a screw
• a wheel and a rope
• a wheel and a handle

which of these is an example of a wheel and axle?

• doornob
• hammer
• nail

Mechanical Advantage

• gives the pulley a change in direction
• reduces the effort needed to lift the load
• neither

The more ropes a pulley has, 

• The more force that is needed to lift the load
• the less force is needed to lift the load
• the more work has to be done

Which pulley reduces the most force needed to move an object?

• single fixed/single moveable
• single fixed
• single moveable

which of these is an inclined plane?

• screw driver
• seesaw
• axe
• ramp

Brayden and his father used a ramp to get a dresser into the truck. What did the ramp decrease?

• Height lifted
• Effort force
• Distance moved
• Work done