A pulley is a grooved wheel with a _________ around it.
What is rope?
100
The part of this simple machine that's considered the "shaft"
What is the axle?
100
Examples of an inclined plane
What is a loading ramp or wheel chair ramp?
100
Marc is asked to raise a flag at the Remembrance Day ceremonies at his school. If the effort force to raise the flag is 50N and the load force—the flag plus the rope—is 50N what is the mechanical advantage of the pulley on the flagpole?
What is 1?
200
The classification of a crowbar or hammer claw
What is 1st class lever?
200
An example of a pulley
What is fishing pole, flag pole, clothesline, winch, sail boat, or window blinds?
200
The wheel is composed of a series of ___________
What are levers?
200
A screw is an inclined plane wrapped around a ______.
What is a cylinder?
200
A machine can never have an efficiency of ________.
What is 100%?
300
Example of a 3rd class lever
What are tweezers, baseball bat, hockey stick, broom, catapult?
300
A pulley works by changing the __________ of the force.
What is direction?
300
Examples of Wheel & Axles
What is a steering wheel, doorknob, screwdriver, gears, screw driver, and airplane propellers?
300
Examples of a wedge
What is an ax, nail, chisel, knife, push pin, stapler, teeth?
300
What is the mechanical advantage of a lever that has an effort arm of 3 meters and an resistance arm of 2 meters?
What is 1.5?
400
The location of the resistance or output force in a 2nd class lever
What is center or middle (between the fulcrum and effort (input) force)?
400
How to figure out the mechanical advantage of a pulley
What is counting the # of ropes?
400
The function of the wheel and axle.
What is turning?
400
Inclined Planes, Screw, & Wedges all have a _________ surface.
What is sloping?
400
A certain fan is capable of using 4800J of electrical energy each minute, converting 4000J of it into kinetic energy of the fan. What is the efficiency of this fan?
What is 83.33%?
500
Most levers work by __________ __________.
What is multiplying force?
500
The reason work seems easier with a pulley
What is going in the same direction of gravity?
500
Example of gears
What is a clock, bicycle, scales?
500
An inclined plane and screw work by __________ and ___________ force
What is multiplying and redirecting?
500
A nutcracker is used to crack open a crab leg. 20 N of force is applied to the nutcracker and the nutcracker applies 50 N of force to the crab leg. What is the mechanical advantage of the nutcracker? This lever does 765 J of work and the person using the lever applies 890 J of work. What is the efficiency of the lever?