Work
This is the unit of Work
What is a Joule?
These are the two variables that kinetic energy is dependent upon
What are mass and velocity?
The two equations for potential energy
What is PE=mgh and WT x Height
the sum of kinetic energy and potential energy
This is the unit for power.
What is Watt (or Joule/sec)?
this has to be true in order for work to be done
What is the distance and the force need to be in the same direction
This is the amount that kinetic energy changes when the velocity of an object is doubled.
What is increased x4?
This is how much potential energy is gained by a 150 kg climber that scales a 100 m cliff.
What is 147,000 J?
energy resulting from changes in the atomic nuclei or from nuclear reactions
What is nuclear energy?
This is the power exerted by lifting a 50kg barbell 1.6 m high in 0.8 s.
What is 98 W?
If a neighbor pushes a lawnmower four times as far as you do but exerts only half the force, this is the person who has done more work...and by this much.
The neighbor ... 2x as much work
This is the amount of kinetic energy of a 65kg sprinter running at 8.4 m/s?
What is 2293.2 J?
This is the loss in potential energy of an 8kg apple that falls from a 5 m high tree branch.
What is 392 J?
a form of potential energy and is the energy stored in food or gasoline
What is chemical energy?
This is how many joules of energy a 60W light bulb can produce in 25 minutes.
What is 90,000 J?
This is the amount of net work done on a box that moves 20m and is pushed with a 350N horizontal force
What is 7,000 J?
This is the speed of a 35000 kg train that has a kinetic energy of 282,000 J.
What is 4.01 m/s?
Determine the gravitational potential energy of a guillotine if the mouton (the weighted blade) has a mass of 40 kg and is raised 2.5 m above the neck of the condemned.
What is 980 J?
is produced when an object is made to vibrate
What is sound energy?
An automobile engine delivers 50 hp of power. This is how much time it will take for the engine to do 6.4 x 10^5 J of work. (1 hp = 746 W)
What is 17.2 s?
Angela uses a force of 2.5 Newtons to lift her grocery bag while doing 13.75 Joules of work. How far did she lift the grocery bags?
What is 5.5 meters?
Though slow on land, the leatherback turtle holds the record for the fastest water speed of any reptile. The largest leatherback yet discovered could swim at a speed of 9.78 m/s. If its KE was 60,800.0 J, what was its mass?
What is 1,266 kg
2 types of energy that are classified as potential
What is chemical (food) , nuclear (fusion or fission), mechanical (Stretched rubber band) and gravitational (position and location)
this type of energy can be transferred from particle to particle or object to object in three different ways: Conduction, Convection and Radiation
What is thermal energy?
This is how long it takes a 19 kW steam engine to do 6.8 x 10^7 J of work.
What is 3579 s --> 0.99 hr?