A 4 kg rock is sitting on a 3 m ledge. How much potential energy does it have?

4 kg means what?

1.   ?    m (mass)
2.   ?    h (height)
3.   ?    v (velocity)
4.   ?    F (force)
5.   ?    a (acceleration)
6.   ?    t (time)
7.   ?    W (work)
8.   ?    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?

1.   ?    m (mass)
2.   ?    h (height)
3.   ?    v (velocity)
4.   ?    F (force)
5.   ?    a (acceleration)
6.   ?    t (time)
7.   ?    W (work)
8.   ?    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?

1.   ?    Acceleration of gravity
2.   ?    The force of gravity
3.   ?    The mass factor of gravity
4.   ?    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?

1.   ?    9.8 m/s²
2.   ?    15 m/s²
3.   ?    3 m/s²
4.   ?    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?

1.   ?    10 m/s²
2.   ?    9 m/s²
3.   ?    9.5 m/s²
4.   ?    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?

1.   ?    GPE = mgh
2.   ?    F = ma
3.   ?    KE = 1/2 mv²
4.   ?    S = D/t
5.   ?    p = mv
6.   ?    W = Fd
7.   ?    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?

1.   ?    m x g x h
2.   ?    m ÷ g ÷ h
3.   ?    m + g + h
4.   ?    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?

1.   ?    Ep = 4kg x 10 m/s² x 3 m
2.   ?    Ep = 4 kg x 10 m/s² ÷ 3 m
3.   ?    Ep = 4 kg ÷ 10 m/s² ÷ 3 m
4.   ?    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)

1.   ?    120
2.   ?    30
3.   ?    40
4.   ?    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?

1.   ?    Ep = 120 J
2.   ?    Ep = 120 w
3.   ?    Ep = 120 kg
4.   ?    Ep = 120 m