Simple machines are tools with few or no moving parts that make what easier?
Work
100
Define an inclined plane.
The incline plane is a sloping surface that connects a higher level to a lower level.
100
Define lever.
A lever is a rigid bar that rests on a fulcrum.
100
Define a wheel and axle.
A wheel and axle is a simple machine that consists of a larger wheel connected to a center rod, called an axle.
100
Does a pulley change the amount of force needed to move an object?
NO! It changes the direction of the force, and it often makes moving an object more manageable.
200
What is needed for a simple machine to be used as a tool?
Force of push or pull
200
How does an inclined plane make work easier?
Moving an object up and down an inclined plane requires less force than moving that same object by lifting it.
200
How do levers make work easier?
Levers allow us to lift objects using less force.
200
How does a wheel and axle make work easier?
Wheel and axles make it easier to move objects across surfaces by reducing the amount of friction between the object and the surface.
200
Give three examples of pulleys.
Crane, flag pole, sails etc.
300
What is the weight or resistance that is moved using a simple machine?
A load
300
Give one example of an inclined plane and explain how it will make work easier.
Many Options Here!
300
Label the components of a lever using the terms force, fulcrum, load.
Draw Answer on Board
300
Would a car be easier to push on it side or on its wheels?
The car would be easier to push on wheels because wheel and axles reduce friction between the car and the surface it moves upon.
300
Compare a single pulley to a compound pulley.
KEY POINT: A compound pulley REDUCES the amount of force needed to move the load, a single pulley DOES NOT REDUCE the amount of force needed to move the load.
400
What do we call a machine when two or more simple machines work together as one?
Compound Machine
400
Does increased friction make moving an object up an inclined plane easier or harder?
More friction makes moving an object up an inclined plane harder.
400
How can we decrease the amount of force required to move a load when using a lever.
We can move the fulcrum closer to the load.
400
What surface does a wheel and axle move more easily across.
Surfaces with low friction (smooth surfaces)
400
A compound pulley (double pulley) is an example of a ...
Compound machine
500
Define friction
Friction is the action of one surface or object rubbing against another surface or object.
500
Name a surface that could cover an inclined plane that would increase friction.
Sandpaper
500
Give three examples of levers.
Pan balance, see-saw, boat oar, scissors.
500
Give three examples of a wheel and axle.
Bicycle tire, fan, steering wheel etc.
500
What force do you use to lift the load when using a pulley?