The Sarcastic Fringehead
Name the six simple machines
lever, wheel and axle, inclined plane, wedge, screw, pulley
A carpenter applies 475 N to the end of a crowbar. The force exerted on the board is 950N. What is the mechanical advantage of the crowbar? MA= output force / input force
2
Find the force needed to lift a 2000N rock, using a jack with a mechanical advantage of 10. MA= Fout/Fin
200N
Where is the output force on a second class lever?
In between the input force and the fulcrum.
What is force measured in?
Newtons
The thread around a screw is a lever
False- inclined plane
The force exerted by your foot on a pedal to ride your bike is an example of ______. :
input force
An inclined plane with one or two sloping sides forms a machine called a ______.
wedge
A winding mountain road is an example of _______.
Inclined Plane
What is the rate at which work is done?
power
What is work measured in?
Joules
Can a machine have a mechanical advantage less than 1?
Yes, output force is less than the input force. Rake
You exert an input force on a hammer. The hammer exerts a(n) _____ force on the nail.
output
Distance is measured in _____?
meters
Power is work divided by ______.
time
What is the unit for Power?
Watt
What amount of work is being done when you push against an immovable brick wall?
None, it didn’t move.
What mechanical advantage is IMPOSSIBLE to achieve?
100%
A machine that only changes the direction of the force has a mechanical advantage of _____?
1 Example: Fixed pulley
The unit of measure for power is ______.
watt
You can get more work out of a machine than you put into it?
False
An inclined plane wrapped around a cylinder post is a____?
screw
What kind of lever is a soda pop tab?
First class lever
The amount by which a machine multiples an input force is called the ______.
mechanical advantage
How do you increase an inclined planes mechanical advantage?
Increase the length and decrease the height