Force, Work, and Power
Units of Measure
Simple Machines
Friction
Challenge!
100
What is a force?
a push or a pull
100
Unit for Force
Newton
100
your front teeth
wedge
100
What do you create when you rub your hands together?
friction and heat
100
you are sliding outside on the ice. How could you increase friction to stop sliding?
wear better boots with more bumpy soles
200
What are the three things you need for work to be done?
A force, a movement, same direction
200
Unit for distance
meters
200
used to lift things straight up
a pulley
200
What part of a car is designed to create friction?
the brakes
200
The Ortiz’s daughter wants to help with the moving. But she is only 5, so she is not very strong. Should she use the ramp to move the boxes, or lift them straight up?
use a ramp. Bonus: Why?
300
Angel uses 15N of force to push a desk 6 meters. How much work did he do?
90J of work
300
Unit for time
Seconds
300
the ancient Egyptians used this to build their pyramids.
Inclined plane Bonus: is it better to use a short and steep inclined plane or a long and shallow one?
300
If your are on a bumpy road with more friction, what will happen to the force needed?
it will increase
300
The Ortiz family is moving to a new apartment, so they’ve hired professional movers. These movers are very strong. They want to get the job done as fast as possible. Should they use a ramp to move the boxes, or lift them straight up?
Lift them straight up. Bonus: Why?
400
What is power?
How fast work is done or work divide by time
400
Unit for work
Joules
400
a door, scissors, and seesaw all have this type of simple machine.
a lever
400
What should you do to lower friction? (think ice)
make it slippery
400
Why do people put sand on the road after a snowstorm?
it creates more friction so the cars and people won't slide
500
If Yarelis did 24J of work in 3 seconds, how much power did she use?
8 Watts of power
500
Unit for power
Watt
500
The top of a jar usually uses this kind of simple machine
screw bonus: which other type of simple machine is used in a screw?
500
if you get your hand stuck in a jar, how could you change the friction to get it out?
lower friction by using lotion or vasaline
500
You’re painting your kitchen, and you take a lunch break. When you come back you find that the lid got stuck on the can. What simple machine would you make to help you get the lid off? What objects from the kitchen could you use to make this simple machine?
lever, a knife
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