Force
The Machines
From Class
Input/Output
Random
100
What is the unit of force?
Newton
100
What is a machine that uses a fulcrum?
Lever
100
What was the machine used to balance pennies?
Lever
100
What is the force applied to a machine called?
Input force.
100
Name 2 simple machines on a pirate ship.
Captain's wheel, bow, little boat pulleys...
200
What is a compound machine?
A tool made up of more than 1 simple machine.
200
What is a machine that reduces friction by rolling heavy weight rather than sliding it?
Wheel and axle
200
What is the machine represented by wrapping rope around 2 wooden sticks?
Pulley
200
What is the force or work done by a simple machine called?
Output force.
200
How is a wedge different from an inclined plane?
A wedge is 2 inclined planes back to back.
300
What is the force called that opposes motion as an object is sliding?
Friction
300
Give an example of a simple machine in the human body.
Teeth, arm/elbow...
300
What was the instrument used to measure the angle of the inclined plane used to drag the textbook up the wood?
Protractor
300
Output force/ input force = ______________
Mechanical advantage
300
Where is the fulcrum located in a class 1 lever?
The middle.
400
You are riding a penny-farthing, does the small wheel or large wheel rotate more quickly (RPM) or are they the same?
Small wheel has higher RPM.
400
How is a nail different from a screw?
A screw has an inclined plane, and a nail is a wedge.
400
What was the fulcrum of the lever used to balance pennies?
The pencil.
400
Where is the input force applied in a pair of scissors?
The handles
400
W = F x d What do the letters represent in this formula?
Work = force x distance
500
Why do normal car tires have treads, but racing cars have tires without treads (slicks)?
Treads get rid of water beneath wheels, slicks grip road better - more friction.
500
What class lever is a broom?
Class 3 - fulcrum and load at ends, effort in middle.
500
In order to keep a seesaw balanced, how must effort change if the load moves closer to the fulcrum?
Less effort.
500
If the axle radius is constant in a wheel and axle, does the mechanical advantage increase or decrease as the wheel radius increases?
Mechanical advantage will increase.
500
What is the unit for work?
Joules
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