Potential Energy Problems
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
4 kg means what?
- m (mass)
- h (height)
- v (velocity)
- F (force)
- a (acceleration)
- t (time)
- W (work)
- d (distance)
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
m = 4 kg
3 m means what?
- m (mass)
- h (height)
- v (velocity)
- F (force)
- a (acceleration)
- t (time)
- W (work)
- d (distance)
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
m = 4 kg
h = 3 m
What is g?
- Acceleration of gravity
- The force of gravity
- The mass factor of gravity
- The speed of gravity
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
m = 4 kg
h = 3 m
g = acceleration of gravity
g is how much?
- 9.8 m/s2
- 15 m/s2
- 3 m/s2
- 12.2 m/s2
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
m = 4 kg
h = 3 m
g = 9.8 m/s2
To make calculations easier, what can we use for g instead?
- 10 m/s2
- 9 m/s2
- 9.5 m/s2
- 11 m/s2
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
m = 4 kg
h = 3 m
g = 10 m/s2
What is the equation for Potential Energy?
- GPE = mgh
- F = ma
- KE = 1/2 mv2
- S = D/t
- p = mv
- W = Fd
- V = IR
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
m = 4 kg
h = 3 m
g = 10 m/s2
Equation: Ep = mgh
What does "mgh" mean?
- m x g x h
- m ÷ g ÷ h
- m + g + h
- m - g - h
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
m = 4 kg
h = 3 m
g = 10 m/s2
Equation: Ep = mgh
Which of the following is right?
- Ep = 4kg x 10 m/s2 x 3 m
- Ep = 4 kg x 10 m/s2 ÷ 3 m
- Ep = 4 kg ÷ 10 m/s2 ÷ 3 m
- Ep = 4 kg + 10 m/s2 + 3 m
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
m = 4 kg
h = 3 m
g = 10 m/s2
Equation: Ep = mgh
Ep = 4kg x 10 m/s2 x 3 m
So, Ep = ___ (no units, yet)
- 120
- 30
- 40
- 1200
A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?
m = 4 kg
h = 3 m
g = 10 m/s2
Equation: Ep = mgh
Ep = 4kg x 10 m/s2 x 3 m
So, Ep = 120
What are the units for Ep?
- Ep = 120 J
- Ep = 120 w
- Ep = 120 kg
- Ep = 120 m