Work it!
Two students who are similar in size walk up the same set of stairs. They are doing _________________ amount of work.
The two factors of power are work and ________________.
What is time?
A diver on top of a diving board is an example of ______________________ energy.
What is potential energy?
knife
What is an example of a wedge?
Calculate Work: An object is pulled upward at constant speed by a 20-N force for a vertical displacement of 5.0 m.
20N x 5 m = 100 J
Work = ____________________ x ___________________
What is FORCE x DISTANCE?
Power is measured in _____________________.
A car rolling down a hill is an example of _____________________ energy.
What is kinetic energy?
An example of a pulley.
What is a flag pole, crane, blinds for a window...
Calculate Work: 100 N force is applied to move a 15 kg object a horizontal distance of 5 meters at constant speed.
Holding a stack of books - work or not?
The _________________ amount of time it takes to do work, the more power is produced.
What is shorter?
A person skiing down a slope is ______________________ potential energy, and ____________________ kinetic energy.
What is losing potential energy and gaining kinetic energy?
If a man moves a large box that weighs 10 Newtons 20 meters in 30 seconds, how much power was used?
200 J/30 seconds = 6.7 Watts
Pushing against a wall is an example of doing work. True/False
What is false - not moving over a distance!
Two cars that weigh the same race up the hill. Car 1 gets there twice as fast as Car 2. Which car had more power?
What is car 1?
The unit of energy.
What is joules?
How much time is needed to produce 720 Joules of work if 90 watts of power is used?
A monster truck and a golf cart climb up the same hill. Which does more work.
What is the monster truck - because it weighs more!
Power = ___________________/ ___________________
What is WORK/ TIME?
The definition of energy.
What is the ability to do work?
On a recent adventure trip, Anita Break went rock-climbing. Anita was able to steadily lift her 80.0- kg body 20.0 meters in 100 seconds. Determine Anita 's power rating during this portion of the climb.
Anita needs to apply a force that is equal to her weight in order to elevate her body a distance of 20.0 m. This force is equal to (80 kg)•(9.8 m/s2) = 784 N.
Work = F x d = (784 N) x (20.0 m) = 15680 J.
Power = W/t = (15680 J)/(100 s) = 157 Watts