Physics

Question 1

Name the 8 types of energy

Answer 1

Sound
Heat
Chemical
Electrical
Kinetic
Gravitational Potential
Elastic
Light

Question 2

What is efficiency?

Answer 2

Measure of how much useful energy is retained in a conversion

Question 3

What is the equation for efficiency?

Answer 3

efficiency = useful energy out / useful energy in x 100

Question 4

What is the formula for Gravitational Potential Energy? What does each letter stand for, and what unit is it measured in?

Answer 4

GPE=mgh
GPE= gravitational potential energy (joules or kilojoules
m = mass (kg)
g = gravity (9.8 OR 10m/s)
h = height (m)

Question 5

What is the formula for Kinetic Energy? What does each letter stand for, and what unit is it measured in?

Answer 5

KE=1/2mv^2
KE = kinetic energy
m = mass (kg)
v = velocity (m/s)

Question 6

What is the formula for Elastic Potential Energy? What does each letter stand for, and what unit is it measured in?

Answer 6

EPE = 1/2kx^2
EPE = Elastic Potential Energy (j OR kj)
k = spring constant (n/m)
x = distance something stretches (m)

Question 7

What is “work”?

Answer 7

The amount of distance an object covers from its original position.

Question 8

What is the formula for Work? What does each letter stand for, and what unit is it measured in?

Answer 8

w = fd
w = work (j OR kj)
f = force (N)
d = distance (m)

Question 9

When GPE is max, how much KE is there?

Answer 9

KE = 0

Question 10

When KE is max, how much GPE is there?

Answer 10

GPE = 0

Question 11

What does the Law of Conservation of Momentum state?

Answer 11

The total momentum of a system won’t change unless an external force acts upon it.

Question 12

What is the formula for momentum? What does each letter stand for, and what unit is it measured in?

Answer 12

p = mv
p = momentum (j OR kj)
m = mass (m)
v = velocity (m/s)