The kind of energy that a speeding train possesses.
What is kinetic energy
100
Pushing a box with a force of 50 N toward the door 2.5 meters does ________ work.
What is 125 (joules)?
100
Gravitational potential energy depends on three things: ___________, ____________, and ___________.
What are mass, height, and free-fall acceleration? (in any order)
100
A man exerts 240 J of work pushing a box up a ramp, but only increases the potential energy of the box by 180 J. His efficiency is
What is 75%?
100
Plants turn sunlight into chemical potential energy using this process.
What is photosynthesis?
200
The kind of energy that affects the motion of everyday objects
What is mechanical energy
Kinetic is acceptable
200
Gravity does _________ of work when it pulls a 600 N man down 150 meters.
What is 9000 joules (J)?
200
As the speed of a 5 kg object doubles from 1.0 m/s to 2.0 m/s, its kinetic energy changes in this way.
What is quadruples (goes up by 4 times).
200
A man uses a pulley to lift a 600 N box, and but he must exert a 650 N force to get the box to move. The pulley's efficiency is _________.
What is 92% (accept 90% and 92.3%)
200
This is the source energy released when dynamite explodes.
What is chemical potential energy?
300
It transfers energy or changes the form of energy. It's also the product of force and distance.
What is work?
300
Pushing a boulder that doesn't move does this amount of work.
What is zero (joules)?
300
The gravitational potential energy of a 55 kg box 12.5 meters above the ground.
What is 6737.5 J (accept 6875 J)
300
A student puts 300 J of work into a pulley system with an efficiency of 50%, getting ______ J of useful work out of the pulley.
What is 150 (joules)?
300
The source of the sun's energy output is primarily from this.
What is nuclear (fusion) energy.
400
This is measured in watts (W), and measures how quickly work is done.
What is power?
400
When you walk up the stairs in 4.0 second, you do 4000 J of work. When you run up the stairs in 1.5 seconds, you do __________ J of work.
What is the same amount (4000 J)?
400
This is the kinetic energy of a 14 kg dog running at 6 m/s.
What is 252 J?
400
A car engine with 40% efficiency burns 5000 J of gasoline. The car then receives ________ J of output work.
What is 2000 (joules)?
400
This is where the energy is transferred when useful mechanical energy decreases and temperature increases.
What is heat?
500
The ability to do work.
What is energy?
500
It takes __________ of power to lift a 500 N person to a height of 4.0 meters in 2.0 seconds.
What is 1000 W (watts)?
500
Name three kinds of nonmechanical energy.
What are thermal, light (electromagnetic), nuclear, chemical potential?
500
This force is the reason that all real machines have efficiency of less than 100%.
What is friction?
500
If a skier starts out with 5000 J of potential energy at the top of a hill, and goes all the way down the hill without friction or air resistance, then she would have this amount of kinetic energy at the bottom.