Wheelbarrow is an example of what kind of lever?
(1st, 2nd or 3rd)
What is a 2nd class
100
What is the MA of a ramp that is 10 meters long and 2 meters high?
What is 5
100
What are units for power
What are watts
100
___________________ is a measure of the ability to do work.
What is energy
100
Energy cannot be created or destroyed is what law?
What is The law of conservation of energy
200
A lever with the fulcrum in the middle is a _____________ class lever
What is first
200
What is the MA of a single MOVABLE pulley?
What is 2
200
How much power is required to do 180J of work in 6 seconds?
What is 30 watts
200
A man pushes a crate along a factory floor by exerting a force of 100 N. If the crate moves a distance of 5 meters, how much work does the man perform?
What is 500 J
200
A dropped racquetball will not return to its original position because of?
a. potential energy is insufficient
b. energy is not conserved.
c. some of the mechanical energy is converted to nonME.
d. Some ME is stored up for later bounces
What is c.
300
An inclined plane wrapped around a cylinder is a ___________ (wedge, wheel and axle or screw).
What is screw
300
Calculate the MA of a wrench taht allows you to move a bolt 0.1 m by moving the handle 0.5 m?
What is 5
300
If Susie does 500 joules of work in 5 seconds and John does 500 joules in 2 seconds, which one exerts more power?
What is John
300
Gravitational potential energy depends on 3 things. What are they?
What is mass of the object, height of object and acceleration due to gravity
300
As a ball drops toward the ground _____________energy is converted to ___________energy.
What is potential, kinetic
400
What are the 2 families of simple machines?
What is levers and inclined plane
400
A pulley with a MA of 5 is used to lift a bucket weighing 500N. How much force must be used to lift the bucket?
What is 100N
400
Victoria pushed a crate up a 10 meter inclined plane exerting 100 N of force in 5 seconds. How much power did she exert?
What is 200 watts
400
How efficient if a machine that uses 130 J to lift a 50 N load 2.0 m?
What is 77%
400
Calculate the GPE when an 82 kg person climbs to the top of a 2.0 m stepladder.
What is 1.6 X 10 3 Joules
500
Multiple pulleys put together in a single unit are called a ______________________.
What is compound pulley or block and tackle
500
What is the MA of a single fixed pulley?
What is 1
500
What is the KE of a 1.40 kg discus with a speed of 22.5 m/s?
a. 15.8 J
b. 31.5 J
c. 354 J
d. 709 J
What is 354 J
500
The sum of an objects kinetic and potential energy is its
What is mechanical energy
500
The transfer of energy to a body by the application of a force that causes the body to move in the direcction of the force is called.
a. power b. work c. distance d. mechanical advantage