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5th grade levers and pulleys
Terms in this set (36)
the mass lifted or resistance to overcome
The force needed to move a load or overcome resistance.
A simple machine used to make work easier.
A unit of measurement, measure, effort (force)
The point where the lever arm pivots
A wheel with a round rim in which a rope can run to change effort.
A stick or beam free to pivot at a point.
A device that provides an advantage to a user, makes work easier.
A wheel that is attached to something above the load.
Has a wheel that is attached to a load.
Fulcrum, arm, load
What are the three main parts of a lever?
See-saw, paint can opener, = FULCRUM in the middle
Class One example
Wheelbarrow, paper cutter, = LOAD in the middle
Class Two example
golf club , tennis racquet, baseball bat, whip = EFFORT in the middle
Class Three example
They should be close together
If you are going to set up a lever system, what should your remember about the position of the fulcrum and load?
They need to be far apart.
When you set up a lever system, what should you remember about the position of the effort and the fulcrum?
Levers make work easier.
Why to people use levers?
The unit of measure to see how much effort is used.
What is a Newton?
1) reduced effort 2) change of direction
What are the advantages to using pulleys?
1) more rope is needed to reduce the effort
What are the disadvantages to using pulleys?
balanced by the distance over which the effort must act.
In a lever system, a reduction in effort is...
The benefits gained by using simple machines are always balanced by what?
As the effort decreases, the length of rope that must be pulled...
the price (drawback) attached to reduced effort is that it must be applied over a...
describe or draw answer 2
If you wanted to lift a 100 pound bag of cement from the floor to a desktop, what kind of pulley system would you you set up?
describe or draw answer 3
If you wanted to lift your math book from the floor to your desk top, what kind of pulley system would you set up?
describe or draw answer 1
What is the relationship between the number of ropes pulling the load and the amount of effort needed to lift the load?
describe or draw answer 4
If a pulley system gives you a mechanical advantage (less effort to lift the load) what is the disadvantage?
a single fixed pulley
A single-movable pulley
a single fixed/single moveable pulley with effort going down
a single fixed/single movable pulley with the effort going up
Set up a see saw that would work if the kids weighed the same.
Set up a see saw if one kid weighed a lot more.
It depends how you set up the lever.
How much effort does it take to lift any load with a lever?
Less effort with more rope. Less effort with more pulleys.
How much effort does it take to lift a load with a pulley?
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