Work Done
A person lifting up a 30 kilogram bag of rocks up .5 meters does this much work.
What is 150 Joules?
(30 kg * 10 m/s^2) * 0.5 m * cos0
300 N * 0.5 m * 1 = 150 J
A baseball is 50 meters and 100 meters above the ground. This one has the greater energy.
What is the 100 meter baseball?
For the speed of an object falling to the ground.
What is mass does not matter?
mgh = 1/2*m*v^2
gh = 1/2*v^2
v = sqrt(2gh)
A skier on the top of a mountain has this/these type(s) of energy/energies.
What is gravitational potential energy?
These are the units of power.
What are Watts?
A person pushes a desk with a force of 400 N a distance of 4 meters across the classroom does this much work.
What is 1600 Joules?
400 N * 4 m * cos0
400 N * 4 m * 1 = 1600 J
A 5 kg and 10 kg mass are 10 meters above the ground. This one has the greater energy.
What is the 10 kg mass?
PE = mgh
For the height of an object thrown straight up.
What is mass does not matter?
1/2mv^2 = mgh
1/2v^2 = gh
v^2/2g = h
A car driving along a flat road has this/these type(s) of energy/energies.
What is kinetic energy?
Power is a measure of this.
What is the rate at which work is done?
A person stops a large bus with a force of 500 N over a distance of 50 meters does this much work.
What is -25,000 Joules?
500 N * 50 m * cos180
500 N * 50 m * -1 = -25,000 J
A 5000 kg elephant moving at 0.25 m/s or a 1 kg ferret moving at 20 m/s. This one has the greater energy.
What is the ferret?
For the speed of a skier going down a frictionless slope.
What is mass doesn't matter?
A mass on a pendulum somewhere in the middle of its swing has this/these type(s) of energy/energies.
What is gravitational potential energy and kinetic energy?
The power output of a pump if it does 500 J of work in 10 seconds.
What is 50 Watts?
A teacher carrying a 22 kilogram stack of books 3 meters across the classroom does this much work.
What is 0 Joules?
(22 kg * 10 m/s^2) * 3 m * cos90
220 N * 3 m * 0 = 0 J
A 2 kg fish swimming at 4 m/s or a 1 kg bird perched on a tree 3 meters in the air. This one has the greater energy.
What is the bird?
The energy of a cat in the middle of jumping onto the table.
What is mass matters?
E = PE + KE
E = mgh + 1/2mv^2
A track star doing a running jump over a hurdle has this/these type(s) of energy/energies.
What is kinetic and potential energy?
The work done in 6 seconds by a car if its power output is 5000 Watts.
What is 30,000 J?
A person pushing a shopping cart with a force of 100 N a distance of 4 meter at an angle of 60 degrees does this much work.
What is 200 Joules?
100 N * 4 m * cos(60)
100 N * 4 m * 0.5 = 200 J
A 20 kg dog running at 5 m/s or a 10 kg cat 2.5 meters above the ground. This one has the greater energy.
What is they both have the same energy?
For the speed of a mountain biker going down a rough (friction) path.
What is mass matters?
Water being pumped up a hill this/these type(s) of energy/energies.
What is gravitational potential energy and kinetic energy?
The power output of a 500 kg car if it speeds from 0 m/s to 10 m/s in 2 seconds.
What is 12500 Watts?