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15 Cards in this Set

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FRICTION

What causes friction?
Rough parts of surfaces catch on each other and create friction when they rub together.
FRICTION

What is the definition of friction?
Friction is a force that takes place when one surface slides against another.
FRICTION


In what way does friction make work more difficult?
With friction we must increase force for work to take place.
FRICTION

Does friction take place on an inclined plane?
Yes, too surfaces rubbing
ARCHIMEDES


How did Archimedes die?
soldier killed him
he was too busy thinking to be afraid and did not move when he was told to do so
TOOLS

How do tools make work easier?
It changes the force applied to work, it changes the direction of the force
USE OF INCLINED PLANE

What does it mean when it says an inclined plane gives the worker a mechanical advantage?
It means he can exert less force to do the same amount of work.
USE OF INCLINED PLANE

The amount of effort we save by suing a tool is called its _______
Mechanical advantage
WORK
Two things must happen for work to take place. What are they?
an object, or load, must move, a force must be used in the direction of the movement
WORK
Calculate the amount of work if 10 pounds were moved 2 feet
20 foot-pounds
WORK

Calculate the amount of work if 20 pounds were moved 3 feet
60 foot-pounds
WORK

Calculate the amount of work if 5 pounds were moved 30 yards
150 yard-pounds
FRICTION

Why would an engine overheat?
Surfaces rubbing on each other causing friction
FRICTION

Explain how car brakes work.
The brakes rubbing against the wheels create enough friction to stop the car.
WEDGES

What are some common wedges that are used every day.
Some common wedges are knives, scissors, and doorstops