Kinetic
What is the equation for kinetic energy?
KE = 1/2mv2
What 2 factors influence the GPE of an object?
mass and height
What unit is thermal energy measured in?
Joules
Name 1 object that using Elastic Potential Energy
Slingshot, Spring, Rubber Band, Bow & Arrow
What types of energy are used when jumping on a trampoline?
Elastic Potential, Gravitational Potential, and Kinetic
The v in the kinetic energy equation is this.
Velocity
The value of gravity on earth w/ units.
9.8m/s2
What is the equation for thermal energy?
Q = mcT
What is the equation for Elastic Potential Energy
EPE = 1/2kx2
What is used to determine how effectively the energy is used that inputted versus the amount outputted.
Efficiency
Which car requires more energy to stop if traveling at the same speed? A 5000kg car or a 400kg car.
A 5000kg car because it has a higher Kinetic Energy.
h = GPE/((m)(g))
What the c represents in the thermal energy equation?
Specific Heat
What is the unit for k?
N/m
How fast will the 25kg rollercoaster move at the bottom of the track if the rollercoaster starts 50m in the air? Assume g = 9.8m/s2 and no energy is lost in the system.
31.3m/s
Find the Kinetic Energy: A 100kg dog is running at 15m/s.
22500J
How much GPE does a 5kg apple have that sits 30m above the ground?
1470J
What does a negative thermal energy value represent?
Releases heat (Gets colder)
Determine the amount of energy stored in a 12N/m spring that is pulled back 10m.
600J
You bounce a 1kg bouncy ball that has a spring constant of 100N/m from 25m high that slightly deforms by 0.25m before bouncing back up. If the only energy lost was the elastic energy, how fast would the bouncy ball bounce back up by?
22m/s
How fast would a 150kg car need to drive to generate 350000J of energy?
68.3m/s
Determine the mass of an object that has 750J of energy that sits 25m above the ground.
3.07kg
Find the energy absorbed in a 25kg lead box is heated up by 20C. Assume c_lead = 0.129J/kg/C
64.5J
How far does the 15N/m slingshot need to be pulled back to generate 800J of energy?
10.3m
You are designing an 1000kg ice rink originally at 15C that has 30kg skaters skating at a rate of 12m/s. If 75% of the energy is transferred into heat energy how hot will the ice get? Will the ice melt? Assume c_water = 4.18J/kg/C.
15.39C, No