PE
What is potential energy?
A form of energy due to an object's position, properties, and forces acting on it.
What is kinetic energy?
A form of energy due to motion.
What is the potential energy of a 10 gram ball that is held 2 meters from the ground?
200 J
What is the kinetic energy of a 30 gram ball that is rolling at a speed of 2 meters per second?
60 J
What is the definition of energy?
The ability to make things move or change.
How do you solve for potential energy?
MGH (mass x gravity x height).
How do you solve for kinetic energy?
1/2mv2
1/2 (mass) x (velocity 2)
If the diver on the diving board weighs 500 N and the diving board is 5 m above the ground, then what is the diver's gravitational potential energy?
25,000 J
Calculate the kinetic energy of an object of mass 2kg moving with a speed of 3m/s.
9 J
What is elastic potential energy?
A form of energy stored by compressing or stretching an elastic object.
Do heavier or lighter objects have more potential energy?
The heavier the object and the higher from the ground, the more potential energy it holds.
Which has more kinetic energy, a heavy or light object?
A more massive (heavier) object.
A 30 kg child climbs 15 meters up a tree. When he looks arounds, what is the child’s potential energy?
4410 J
A car of mass 800kg has a speed of 10m/s (about 20 mph). Calculate its kinetic energy.
40,000 J
What is gravitational potential energy?
A form of energy due to an object's position in a gravitational field.
What is the unit of gravity?
m/s2
meters per second squared
What is meters per second?
The standard unit of speed and velocity
What is the potential energy of a 300 kg boulder that sits on the edge of a 25 m tall cliff?
73575 J
Calculate the kinetic energy of a ball of mass 250g moving with a speed of 8m/s.
8 J
What is chemical potential energy?
A form of energy stored in chemical bonds.
What is the diffference between gravitational potential energy and elastic potential energy?
Elastic potential energy is stored in stretched or compressed objects, while gravitational potential energy is due to an object's position in a gravitational field.
True or False
It increases or decreases only when the velocity changes.
True
Two objects are kept at different heights, first object is at 5 meters and second object is placed at 15 meters. Which object has more Potential energy if the first object is 5 times heavier than the second?
15 Joules.
Two objects were lifted by a machine. One object has a mass of 2000 grams, and was lifted at a speed of 2 m/sec. The other had a mass of 4000 grams and was lifted at a rate of 3 m/sec.
Which object had more kinetic energy while it was being lifted?
Object 2
What is a Joule?
(Also abbreviated as "J").
A measurement of energy or work.