Download Gravitational Potential Energy

8.5 Gravitational Potential Energy
SWBAT describe and calculate
Gravitational Potential Energy
A 15 kg mass is moving at 7.5 meters per second on a
horizontal, frictionless surface. What is the total work
that must be done on the mass to increase its speed
to 11.5 meters per second?
7.5 m/s
1.
2.
3.
4.
165.8 m/s
38.8 m/s
The bullet with the greater mass; 2 to 1
2.4 J, 9.6 J; the bullet with the greater speed;
1 to 4
5. 1.6 x 103 kg
Potential Energy is energy an object possesses
due to its position or condition.
Definition: GPE is the potential energy stored in the
gravitational fields of interacting bodies. GPE
depends on height from a “zero level” (normally the
ground).
(If something is above the ground, it has GPE)
Units: Joules (J)
Equation:
How can we change
this formula?
GPEGPE
= mgh
= Fg h
= mgh
(Gravitational Potential Energy)= (mass)(gravitational field strength)(height)
= (Weight)(height)
Where is the formula for Gravitational Potential Energy?
A 20 kg crate is lifted a distance of 5 meters.
What is the gravitational potential energy of the
block when it is 5 meters above the ground?
How much work is
done on the crate?
5m
While riding a chairlift, a 800 N skier is raised a
vertical distance of 500 meters. What is the
total change in the skier’s gravitational potential
energy?
What is the work
done against
gravity?