You did 150 joules of work lifting a 120 newton backpack. How high did you lift the backpack?
1.25 meters
100
The formula for time
What is time= work/power
100
When using a simple machine, the output work can never be ______________then the input work
What is greater
100
A motor does 5,000 joules of work in 20 seconds. What is the power of the motor?
What is 250 watts
200
Inclined plane that moves
What is a wedge
200
A bulldozer does 30,000 joules of work to life a boulder a distance of 25 meters. How much did the boulder weigh? (hint: weight of an object is force in newtons)
What is 1200 N
200
The formula for power and units of power
What is power = work/time in watts
200
The resistance force, or the work a machine does to move an object over some distance
What is output force
200
A simple machine can multiply input forces or multiply input distances but . . .
What is never both at the same time
300
A flat sloped surface
What is an inclined plane
300
Work occurs when a forces causes an object to move in the ___________ direction that the force is applied
What is same
300
A vacuum has a power rating of 200 watts. If the vacuum does 360,000 joules of work, how long was the vacuum run in minutes?
What is 30 minutes
300
The number of times the input force is multiplied by a machine
What is Mechanical advantage
300
The general formula for Mechanical Advantage
What is MA= Output Force/Input Force
400
An inclined plane wrapped around a cylinder
What is a screw
400
An ant sits on the back of a mouse. The mouse carries the ant across the floor for a distance of 10 meters. How much work was done by the mouse?
What is none
400
A tractor pulls a wagon for 2.0 kilometers applying a horizontal 2,000 newton force on its hitch for 1 hour. What is the power of the tractor?
What is 1111.11 watts
400
A lever used to lift a heavy box has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?
What is 5
400
A pivot point on a lever is called a
What is fulcrum
500
Two circular objects of different sizes that rotate together
What is a wheel and axel
500
You decide to add up all the work you did yesterday. If you accomplished 10,000 newtons-meters of work. How much work did you do in the units of joules?
What is 10,000 joules
500
A machine uses 200 watts of power to move an object a distance of 15 meters in 25 seconds. Find the force needed and the work done by this machine.
What is Force= 333 newtons
work= 5000 joules
500
A 5 meter ramp lifts objects to a height of 0.75 meters. What is the mechanical advantage of the ramp