Kinetic Energy
Potential Energy
Work and Power
Machines Simple
Simple Machines
100
The abbreviation for Kinetic Energy
What is KE?
100
The abbreviation for Potential Energy
What is PE?
100
The formula for work
Work = Force x distance
(w = F x d)
100
A simple machine consisting of a rigid bar pivoted on a fixed point and used to transmit force
What is a lever?
100
A simple machine consisting of a wheel over which a pulled rope or chain runs to change the direction of the pull used for lifting a load.
What is a pulley?
200
What is the formula we use to solve for Kinetic Energy?
KE = 1/2mv2
200
What is the formula we use to solve for gravitational potential energy?
PE = mgh
200
The formula for power
What is Power = work / time
(P = W/t)
200
A simple machine consisting of a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load.
What is an incline plane?
200
A simple machine that consists of an inclined plane wrapped around a central cylinder
What is a screw?
300
The unit for energy
What is the Joule?
300
The numerical value for g
(acceleration due to gravity on earth)
What is 9.81m/s2
300
The unit for power
What is the Watt?
300
The type of lever pictured here
What is a class 2 lever?
300
The type of lever pictured here
What is a class 1 lever?
400
The energy of a roller coaster that has a mass of 4,000kg and a velocity of 30m/s
What is 1,800,000 J ?
400
The potential energy of a 75kg high school student sitting on a balcony that is 20m high
What is 14,700 J
400
Jim pushes a cart with a force of 40 Newtons for 7 meters, Jon pushes a cart with a force of 50 Newtons for 6 meters. Who does more work?
Jon does more works 300J >280 J
400
Calculate the mechanical advantage of a screw that has a pitch of 5 turns per 1cm, and a diameter of .5cm.
7.85
400
What is the mechanical advantage of a ramp that has slant length of 10m and a height of 2m?
MA=5
500
The mass of an object traveling with a speed of 100 m/s and an energy of 2500 J
What is .5kg ?
500
If a 20kg object has a potential energy of 2,940J, how high above the ground is it?
15m
500
How much energy is needed to run a 100W device for 2 minutes?
12,000 J
500
Give a real world example for each simple machine.
Answers Will vary, but need an example of a lever, wedge, pulley, incline plane, screw, and wheel and axle.
500
What is the mechanical advantage of a pulley if you can pull up an object that has a mass of 200kg with 490N of force?
MA= 4