1. MA = Fr MA = de Fe dr Rearrange the MA formula to calculate Fr dr
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Write the questions & equations:
MA = Fr MA = de
Fe dr
Rearrange the MA formula to calculate Fr dr

2. 1.
To pry a wooden board off of a tree house, you can apply a force of 50 N to a lever. The lever applies a force of 750 N to the board. What is the mechanical advantage of the lever? Q Ra I C F

3. 2.
To lift a block on a movable pulley, you can apply a force of 50 N to a rope. The rope applies a force of 700 N to the block. What is the mechanical advantage of the pulley? Q Ra I C F

4. 3.
If an engine has a weight of 1,800 N, how much force will be required to lift the engine with a pulley system that has a mechanical advantage of 6? Q Ra I C F

5. 4.
To pull a weed out of a garden, you can apply a force of 50 N to the shovel. The shovel applies a force of 600 N to the weed. What is the mechanical advantage of the shovel? Q Ra I C F

6. 5.
Suppose you need to remove a nail from a board by using a claw hammer. What is the distance of effort for a claw hammer if the distance of resistance is 2.0 cm and the mechanical advantage is 5.5? Q Ra I C F

7. 6.
A mover uses a ramp to load a crate of nails onto a truck. The crate, which must be lifted 1.4 m from the street to the bed of the truck, is pushed along the length of the ramp. If the ramp is 4.6 m long and friction between the ramp and crate can be ignored, what is the mechanical advantage of the ramp?
Q Ra I C F

8. 7.
The power steering in an automobile has mechanical advantage of roughly 75. If the effort force on the steering wheel is 49 N, what is the resistance force that turns the car’s front wheels?
Q Ra
I C F

9. 8.
An axe used to split wood is driven into a piece of wood for an effort distance of 3.0 cm. If the mechanical advantage of the axe is 0.85, how far apart (resistance distance) is the wood split?
Q Ra
I C F

10. 9.
An Archimedean screw is a screw within a closely fitting cover, so that water can be raised when the screw is turned. Suppose the screw has a mechanical advantage of If the screw is turned several times, so that the effort distance is 15.7 m, how far has the water been lifted upward by the screw (resistance distance)?
Q Ra I C F

11. 10.
It has been proposed that the stones of the Pyramids in Egypt were raised by using ramps. Suppose one of these ramps had a mechanical advantage of If an effort force of 6350 N was provided by laborers, what would the resistance force on the stone have been?
Q Ra
I C F

12. Summary
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