Energy that Moves
Energy in motion
What is Kinetic Energy?
In a race, two cars have the same mass but different velocities. If we compare the cars, which one has a higher Kinetic Energy, the one with less velocity or more velocity?
What is the car with Less Velocity?
Electric Blanket
What is Electrical --> Thermal?
This is the unit for Work
What is Joules? (J)
The amount of work done in a certain time
What is Power?
A 0.9 kg pineapple falls from a tree that is 5.8 m tall. How much energy does the pineapple have?
What is 51.16 J?
How much energy does a 4kg apple have that is thrown at a speed of 2m/s?
What is 8 J?
Windmill
What is Kinetic --> Electrical?
You move a cart of pumpkins 15m which requires a force of 65N. How much work was done while moving the pumpkin?
What is 975 J?
Determine the amount of power used if you do 100 J of work to move a box for 10 s?
What is 10 W or 10 J/s?
How much heat is needed to warm 0.098 kg of gold from 15oC to 30oC if gold has a specific heat of 136 J/kgoC?
What is 200 J?
List the type of potential energy each object below has:
A) Sandwich
B) Trampoline
What is:
A) Chemical Potential energy
B) Elastic Potential Energy
Fireworks
What is Chemical --> Radiant/Thermal/Sound?
The two conditions that must be met in order for work to be done.
What is
1)the object must move and
2)Force must be applied in the direction of the motion?
How long would it take to do 36 J of work if 4 W of power are available?
What is 9 s?
Define Thermal Energy and Mechanical Energy.
What is:
Thermal Energy = the sum of the kinetic and potential energy of particles in an object
Mechanical Energy = the sum of kinetic and potential energy in a system
How much potential energy does a bird have that weighs 9 N and is sitting on a branch 3 m high?
What is 27 J?
An apple falling off a tree limb
A small child weighs 25N. If they do a somersault and move a distance of 3m, how much work was done?
What is 75 J?
If you push a box with a force of 70 N for 5 s and it moves a distance of 20 m. How much power was used?
What is 280 W or 280 J/s?
What is the mass of a ball that is rolling with a speed of 26 m/s and has 1200 J of energy?
What is 3.55 kg?
What is the mass of a picture that falls off a shelf 6 m high and has 150 J of energy?
What is 2.55 kg?
A man eating dinner, then tap dancing
(Hint: 3 total types of energy)
What is Chemical --> Kinetic --> Sound/Thermal
You push a 12kg barrel of tools at a rate of 3m/s2. If you did 276 J of work, how far did you move the barrel?
What is 7.67 m?
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 motorcycle have?
What is 67.2 W or 67.2 J/s?
What is the height a toy plane can reach that has a mass of 4 kg and is flying at a rate of 9 m/s straight upward? assume all energy is converted.
What is 4.13 m?