Energy Changes
When a roller coaster travels down a drop what happens to it's potential energy?
it decreases
While a boulder is on top of a hill, what type of energy does it have?
Gravitational potential energy
What will the kinetic energy of an arrow having potential energy of 50 J after is it shot from a bow?
50J
What type of energies are transformed when a stretched slingshot releases an object
elastic potential energy to kinetic energy
As a pendulum swings from its highest to lowest position what happens to its kinetic and potential energy?
its potential energy decreases while the kinetic energy increases
Energy of motion
What is the formula for calculating gravitational energy?
mass * gravity* height
A bungee jumper soars off of a very higher bridge, describe the energy transformation from right before they jump to the lowest point of their travel.
gravitational potential energy to kinetic energy and elastic potential as the bungee stretches, left with elastic and gravitational energy at the bottom
As a spring is stretched, its elastic potential energy
increases
Energy due to the position of something
potential energy
What is the formula for calculating kinetic energy?
1/2 *mass*velocity2
A solar panel powers a street light, describe the energy transformations present.
solar / light energy to electrical energy to light energy
A ball is tossed straight up, what happens to its potential energy?
it increases
What is energy stored as heat called?
Thermal energy
A 2kg novel sits on a 1meter high shelf, a 4 kg textbook sits next to it. The potential energy of the textbook is related to the novel by a factor of:
2
List the energy transformations present in a rocket taking off from the ground.
Chemical energy in the fuel turns into thermal energy.
kinetic and potential gravitational energy increase as the rocket moves upward
A ball is tossed straight up, what happens to its kinetic energy?
decreases
A battery transfers energy to turn on a light, what types of energy are present in this scenario?
Chemical energy (battery) light & thermal energy (light)
On earth, g = 10. Calculate the gravitational potential energy of a 4kg cat perched on a window sill 2 meters about the ground.
80 J
A diving board has a spring to allow the swimmer to bounce before jumping towards the water. Describe changes in the energy of a swimmer who dives from a diving board starting just before the swimmer pushes down on the board
diver has gravitational potential energy
adds elastic potential energy from the board. they jump up with kinetic energy and increase their potential energy
increase kinetic energy / decrease gravitational as they fall towards the water