16. What simple machine would you use to get up on a slide?
17. What simple machine would you use to chop down a tree?
18. What simple machine would you use to open a door?
19. What simple machine would you use to take the flag down?
20. What simple machine would you use to get a big rock off the
bike path?
21. What simple machine would you use to hold two boards
together?
22. What simple machine would you use to keep a door from
shutting?
17. What simple machine would you use to chop down a tree?
18. What simple machine would you use to open a door?
19. What simple machine would you use to take the flag down?
20. What simple machine would you use to get a big rock off the
bike path?
21. What simple machine would you use to hold two boards
together?
22. What simple machine would you use to keep a door from
shutting?
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Answer:
16. Workers cut down the tree with an axe or a saw, which use wedges. Or they may use a chain saw, which uses gears. They use a ramp, which is an inclined plane, or a crane made of levers and pulleys to raise the felled tree onto a truck
17. An inclined plane is a flat surface with one end higher than the other. This allows for heavy objects to slide up to a higher point rather than be lifted. It is generally easier to slide something than to lift it. Examples of inclined planes include slides and ramps.
18. If we look at a door, it is easy to see the simple machines operating. There are the hinges (a lever) which enable the door to open and close easily. There is the doorknob (wheel-and-axle) that dislodges the door. There is also a latch (inclined plane) which slides into position to hold the door shut.
19. Pulleys. A pulley consists of a rope, belt or chain fitted into the groove in a wheel. It works by decreasing the amount of effort needed or the direction of force required to lift an object. A single, fixed pulley like a flagpole switches the direction of force needed to lift that flag
20. A common lever and fulcrum can move a very large mass and when assisted with moving wedges to keep the small motions adding up in the desired direction it is possible to move a lot.
21. A screw is another simple machine that is used to hold objects together. A screw is really an inclined plane that is wrapped around a rod. A metal screw can hold two pieces of wood or metal together.
22. A wedge is an inclined plane that moves. Wedges are used to split or lift objects. It takes less force to drive a wedge into or under an object that it does to separate or lift the object yourself. For example, an axe splits wood and a wedge-shaped door stopper rises to keep the door from shutting.