Work, work, work, work, work
The unit for work.
Joules
In a race, two cars have the same mass but different velocities. The car with the slower velocity has a ______ kinetic energy than the other car does.
Less
Electric blanket
electrical, thermal
The amount of work done in a certain time is...
Power
Energy in motion is known as...
Kinetic energy
You move a cart of pumpkins 15m. This requires a force of 65 N. How much work was done while moving the pumpkin.
975 J
Define GPE and give me the equation
Gravitational potential energy is the energy stored in objects that are above Earth's surface.
GPE=ham
Windmill
Kinetic, electrical
How much power is used if 100 J of work is done to move a box in 10 s?
10 W or 10 J/s
A 0.9 kg pineapple falls from a tree that is 5.8 m tall. How much energy does the pineapple have?
51.16 J
The 2 conditions that must be met in order for work to be done.
1. the object must move.
2. force must be applied in the direction of the motion
List the type of potential energy each object below has.
A. Sandwich
B. Trampoline
A. chemical potential energy
B. Elastic potential energy
Fireworks
chemical, radiant/ thermal/ sound
How long would it take to do 36 J of work if 4 W of power are available?
9 s
Define thermal energy and mechanical energy
thermal energy: the sum of kinetic and potential energy of particles in an object
mechanical energy: the sum of kinetic and potential energy in a system
A small child weighs 25N. If they do a tumble and move a distance of 3m, how much work was done?
75J
A roller coaster has a mass of 36,000 kg. If its at peak it reaches a height of 20 m off the ground, how much gravitational potential energy does it have?
GPE- 7,056,000 J
An apple falling off a tree limb
GPE, kinetic
It took you 150 seconds to move a refrigerator. You did 3,150 joules of work in the process. How much power was required to move the refrigerator?
21 J/s or 21 Watts
what is the mass of a ball that is rolling with a speed of 26 m/s and has 1,200 J of energy?
3.55 kg
If 56 J f work energy is required to lift a dumbbell to a height of 7 m, what is the weight of the dumbbell?
Does weight equal force?
8 N
weight = force
How much energy does a 4 kg apple have that is thrown at speed of 2m/s?
8 J
A man eating dinner, then tap dancing
chemical, kinetic, sound/thermal
if you took 7 minutes to move a couch. You did 3,780 Joules of work in the process. How much power was required to move the refrigerator?
9 J/s or 9 Watts
How many pets does Ms. A have at home?
3