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?
100
Power is defined as the
What is work done on an object divided by the time taken to do the work?
100
Energy that is stored and held in readiness is called
________ energy (PE) because in the stored state it has
the ________ for doing work.
What is potential?
100
The kinetic energy of an object depends on the ____ of the object as well as its speed.
What are mass?
100
A ________ is a device used to multiply forces or simply to
change the direction of forces.
What is a machine?
200
In physics, work is defined as
What is force times distance?
200
The unit of power is the
What is watt?
200
____ = 1/2 mv 2
What is KE or kinetic energy?
200
It is equal to half the mass multiplied by the square of the speed.
What is kinetic energy?
200
A type ___ lever has the fulcrum at one end and the load at
the other. The input force is applied between the
fulcrum and the load. The input and output forces are on the same side of the fulcrum and have the same direction.
What is 3?
300
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?
300
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?
300
PE = _ _ _
What are mgh?
300
Which object has larger kinetic energy: a 1000-kg object moving with a speed of 40 m/s or 500-kg object moving at 80 m/s?
What is neither?
300
A ___ is basically a kind of lever that can be used to
change the direction of a force.
Properly used, a ____ can multiply forces.
What is pulley?
400
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?
400
How much power is expended if you lift a 50-N rock 10 meters in 1 second?
What is 500 watts?
400
The potential energy due to elevated positions is _____
potential energy.
What is gravitational?
400
Pull a restroom card....
What is true or false?
game moderator holds the answer
400
The _____ of a machine is the ratio of useful energy
output to total energy input—the percentage of the work
input that is converted to work output.
What is efficiency?
500
How much work is done on a 50-N rock that you lift 10 m straight up?
What is 500 Joules?
500
How much power is required to do 100 J of work on an object in 2 seconds?
What is 50 watts?
500
A stretched or compressed spring has a potential for doing
work and is known as ______ potential energy.
What is elastic?
500
Pull a restroom card ......
What is true or false?
game moderator holds the answer.
500
There are six basic simple machines; lever, wheel and axel, pulley, ______________, wedge and screw.