Definition
work
________ change the direction of the force.
Pulley
What is a compound machine?
A machine that is made up of two or more simple machines.
Work is __________________
the use of a force to move something
The fixed point on a lever is called the ___________.
fulcrum
Which of the following is not a simple machine?
a rack, a screwdriver, scissors, a screw
scissors
A pulley is made up of...
a wheel and a rope
True/False
A inclined planed with greater distance will take greater force.
False. It takes smaller force.
Please identify which of the following is not a compound machine
an ax
a nail
a fork
a nail
Provide an example of a wheel-and-axle
Answer varies
An ice auger is a _________________.
screw
Which of the following compound machines have the same simple machine?
a plier, a doorknob, chopsticks, a pair of scissors, a ramp
a plier, chopsticks, a pair of scissors
wedge
Mr. Huang is moving to an apartment. He's going to load his piano onto a truck. But the stairs of his apartment are just too narrow for the piano, and he's living on the fourth floor. What kind of simple machine can he use? And once the piano successfully gets to the first floor, what is the good way for him to "push" the piano onto the truck?
1. Pulley
2. Inclined plane
Please come up with a compound machine that is made up of three simple machines
fishing rod (lever, wheel-and-axle, pulley)
pizza cutter (lever, wheel-and-axle, wedge)
corkscrew (lever, screw, wheel-and-axle)