Potentially Perfect
What is the value of g (acceleration of gravity) in the formula: GPE = mgh
9.8 m/s2
The energy of motion
kinetic energy
________ J = (1kg) (9.8m/s2) (10m)
98
Green plants convert light energy from the sun into _______?
chemical energy
Energy stored in the bonds between atoms.
chemical energy
Which of the following is not used to calculate potential energy?
a. mass b. height
c. gravitation acceleration d. speed
d. speed
The kinetic energy of an object increases as it mass and _____ increases.
speed
________ J =(0.5 )(3 kg)(42 m/s)
24
Thermal energy is measured in _______?
joules
The law of _______ states that energy can change forms but can't be created or destroyed.
conservation of energy
The ________ energy of an object increases with its height.
potential
_________ can cause kinetic energy to change into thermal energy.
friction
h = GPE/mg
GPE = 98 J
m = 2 kg
g = 9.8 m/s2 What is the height?
5 meters
The mechanical energy of a coconut falling from a tree _____
a. doesn't exist b. increases
c. decreases d. remains constant
d. remains constant
This causes some mechanical energy to turn to heat energy.
friction
Unit used to measure the potential energy in food. It is equal to 4184 J.
calorie
Which of the following is not used to calculate kinetic energy?
a. mass b. weight
c. height d. speed
height
Use the equation KE = 1/2mv2 to calculate the kinetic energy of a 50 kg cart moving at a speed of 6 m/s
900 J
______ energy is the total kinetic and potential energies in a system.
mechanical
Microwaves are this type of energy
radiant
A type of energy that is released when uranium decomposes or the sun shines
nuclear
In the formula KE = 1/2mv2
what is the formula solved for mass?
m =
2KE/v2
A 250 rock is raised 5 m above the ground. What is its kinetic energy just before it hits the ground?
12250 J
This energy is stored when things are compressed.
elastic potential energy
What is the formula for work
W = ?
force x distance
or W = Fd