Kinetic Energy
What is kinetic energy?
The energy of movement
What is work?
A force exerted over a distance
What is power?
The rate at which work is done
What does the Law of Conservation of Energy say?
Energy cannot be created or destroyed under ordinary circumstances
What is potential energy?
Stored energy
At what point on a roller coaster is kinetic energy the highest?
The lowest point
If a box is carried 5ft, what is the work that is done on the box?
0J (force is not in the same direction as distance)
If two students each push a table across the room, but one did it in half the time, who exerted more power?
The one who did it in half the time.
Name two types of energy
Mechanical, Kinetic, Potential, Thermal, Light, Chemical, Electric, Sound
At what point on a roller coaster is potential energy the highest?
The highest point
At what point on a roller coaster is kinetic energy the lowest?
The highest point
What is the work done on a chair that is pushed with 2N of force and moved 6m?
12J
If 100J of work were used in 5 seconds, what was the power exerted?
20W
What is the energy conversion in a solar panel?
Light to electric
At what point is potential energy the lowest?
The lowest point
If a ball has a mass of .5kg, and a pitcher throws it at a velocity of 50m/s, what is the kinetic energy of the ball?
625J
If the work done on a desk was 50J, and the force used on the desk was 4N, how far was the desk moved?
12.5m
If a lightbulb being thrown exerted 50W of power and it took 9s for it to stop, how much work was done?
450J
What is the energy conversion done in a solar panel that is powering a toaster?
If I hold a tennis ball 1m in the air, and the ball weighs .5kg, what is the ball's potential energy? g=9.8
4.9J
If a car has a velocity of 200m/s, and it weighs 600kg, what is the car's kinetic energy?
12,000,000J
A candle is lifted .5m in the air in preparation to blow it out. If the candle weighs .1kg, what is the work being done on it? (g=9.8)
.49J
If a ID card was thrown at the ceiling with 50J of work, and the power exerted was 50W, how long was the ID card heading for the ceiling?
1s
What is the series of energy conversions when you strike a match?
Mechanical to thermal to chemical to thermal and light
If a crane lifts a 600kg car 100m in the air, what is the car's potential energy?
588,000J