Type of Energy
What is the energy of motion called?
kinetic energy
As the mass of an object moving at a given speed decreases its kinetic energy will ______________________.
decrease
What is another name for light energy?
radiant energy
Energy formed when an atom splits apart or when two atoms join to form one.
nuclear energy
What is the Kinetic Energy of a 150 kg object that is moving with a speed of 15 m/s?
KE = ½ (150kg) (15 m/s)2 KE = ½ (150kg)(225) KE = 16875J
The type of Energy that depends on mass and height
potential energy
As the speed of a falling object increases, its potential energy will _____________________.
decrease
What is another name for heat energy?
thermal energy
Batteries are what type of energy? (when NOT in use)
Stored chemical
What is the Kinetic Energy of a 1200 kg object that is moving with a speed of 24 m/s?
KE = ½ (1200kg) (24 m/s)2
KE = ½ (1200kg)(576))
KE = 345,600J
Type of energy that depends on the speed of the object.
kinetic energy
When you drop a book on the floor, what happens to its original potential energy?
potential energy was transformed to kinetic
Give an example of chemical energy
anything that involved molecules storing energy in its bonds
What are three types of energy associated with a lamp?
electrical, thermal, light
Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight in 1985.Determine the work done by Lamar in deadlifting 300 kg to a height of 0.90 m above the ground.
270 J
Type of energy that depends on the flow of electrons
Electrical Energy
A basketball is dropped from a height of 2m and another identical basketball is dropped from a height of 4m. Which ball has more kinetic energy just before it hits the ground?
The basketball dropped from a height of 4m because it has more speed.
State the Law of Conservation of Energy
Energy can not be created of destroyed it can only be transformed.
This is a type of energy that travels in waves and can travel through empty space.
light energy
A man climbs on to a wall that is 3.6m high and gains 2268J of potential energy. What is the mass of the man? (you will have to manipulate the equation)
63kg.
Type of energy stored in bonds of molecules
Chemical Energy
When you drop a tennis ball, it hits the floor and bounces back up. But, it does not reach the same height as before and each time bounce is smaller than the previous one. However, you notice the tennis ball is slightly warmer after it finishes bouncing. Explain how the law of conservation of energy worked in this scenario.
During each bounce, some of the kinetic energy of the ball in transferred into thermal energy. As a result, energy is not created or destroyed, but only changes form so that the law of conservation of energy is obeyed.
Name five types of energy and give an example
any of the following: Kinetic, Potential, Nuclear, Light, Heat, Chemical, sound, electrical, mechanical
As a roller coaster car goes down a hill, its potential energy ________________ and its kinetic energy _______________.
decrease and increase
An object has a kinetic energy of 88 J and a mass of 45 kg , how fast is the object moving? (you will have to manipulate the equation for this one!)
2KE/m = v2 OR v2 = 2KE/m v2 = 2(88J)/45kg
v2 = 3.91
v = 1.98m/s