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lesson3.3
| Question | Answer |
|---|---|
| the forearm of the human body works like a third-class lever. | T |
| when you turn a screw into a piece wood, the input force of the screwdriver is converted to an output force by the threads of the screw. | F |
| the efficiency of such a machine is determined by multiplying the efficiencies of each simple machine. | T |
| what is a simple machine, and what are the six types of simple machines? | a simple machine is work at only one movement (lever, wheel and axel, inclined plane, wedge, screw, pulley) |
| which factors determine whether a lever is a first-class lever, or third-class lever? | location, fulcrum, input, output force. |
| how does the input force applied by a larger gear change when the force is applied to a smaller gear. | it decreases |
| incline plane | ramp, stairs |
| lever | hammer handle, crowbar |
| wheel and axel | shaft |
| drill bit | screw |
| sailboat mast | pulley |
| wheelchair ramp | inclined plane |
| a wheel barrel | wedge |
| a hockey stick | third-class lever |
| an oar | first-class lever |
| what is a compound machine | a compound machine is a machine that uses 2 or more motion |
| how is the efficiency of a compound machine calculated | multiplying the efficiencies |
| how can gears change the size and direction of the force | the input force is applied to a larger gear |
Created by:
spiveshy5637
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