Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
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
|
