Work
A force sets an object in motion. When the force is multiplied by the time of its application, we call the quantity impulse, which changes the momentum of the object. What do we call the quantity force times distance?
What is work?
Energy that is stored and held in readiness is called ________ energy because in the stored state it has the ________ for doing work.
What is potential?
____ = 1/2 mv 2
What is KE or kinetic energy?
A machine puts out 100 watts of power for every 1000 watts put into it. What is the efficiency of the machine?
What is 10?
Work is required to lift a barbell. How many times more work is required to lift the barbell three times as high?
What is three times as much?
How much power is required to do 100 J of work on an object in a time of 0.5 s?
What is 200 watts?
Which object has larger kinetic energy: a 10kg object moving with a speed of 4 m/s or 5kg object moving at 8 m/s?
What is the 5kg object?
What type of lever has the fulcrum in the middle?
What is first class?
Which requires more work, lifting a 10-kg load a vertical distance of 2 m or lifting a 5-kg load a vertical distance of 4 m?
What is the same 200 Joules?
How much power is expended if you lift a 50-N rock 10 meters in 1 second?
What is 500 watts?
The potential energy due to elevated positions is _____ potential energy.
What is gravitational?
What is the velocity of an object that has a kinetic energy of 40J and a mass of 20kg.
What is 2m/s?
The unit of mechanical advantage is the __
What is there isn't one?
How much work is done on a 50-N rock that you lift 10 m straight up?
What is 500 Joules?
How much power is required to do 100 J of work on an object in 2 seconds?
What is 50 watts?
How much more kinetic energy does an object of equal mass have that is going 3 times as fast?
What is 9 times the kinetic energy.
There are six basic simple machines; lever, wheel and axel, pulley, ______________, wedge and screw.
What is inclined plane?