Work, Work, Work, Work, Work
What is the unit for work?
Joules
In a race, two cars have the same mass but different velocities. The car with the slower velocity has _______ kinetic energy than the other car does.
Less
Which TWO energies are involved in an "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 15 m. This requires a force of 65 N. How much work was done while moving the pumpkin?
975 J
How much energy does a 4 kg apple have that is thrown at a speed of 2 m/s?
8 J
Which TWO energies are involved in a "windmill"?
Kinetic Energy -> Electrical Energy
How much power is used if a 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
A small child weighs 25 N. If they do a somersault and move a distance of 3 m, how much work was done?
75 J
List the type of potential energy that each object below has.
A. Sandwich
B. Trampoline
A. Chemical potential energy
B. Elastic potential energy
Which TWO energies are involved in "an apple falling off a tree limb"?
Gravitational potential energy -> Kinetic
How long would it take to do 36 J of work if 4 W of power are available?
9 s
Which non-renewable resource is not a fossil fuel?
Nuclear
What are two 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
How much potential energy does a bird have that weighs 9 N and is sitting on a branch 3 m high?
27 J
Which FOUR energies are involved in "fireworks"?
Chemical -> radiant/thermal/sound
How much power is used if a force of 70 N is used to push a box a distance of 20 m in 5 s?
280 W or 280 J/s
Which renewable resource produces greenhouse gases?
Biomass
How far did you push a 12 kg barrel of tools if you did 276 J of work and pushed at a rate of 3 m/s2?
7.67 m
What is the mass of a picture that falls off a shelf 6 m high and has 150 J of energy?
2.55 kg
Which FOUR energies are involved in "a man eating dinner, then tap dancing"?
Chemical -> kinetic -> sound/thermal
A motorcycle and its rider have a mass of 28 kg. If the cart accelerates at 6 m/s2 during a 40 m sprint in 100 s, how much power did the cart have?
67.2 W or 67.2 J/s
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