Show:
Kinetic Energy
Potential Energy
Conservation of Energy
Calculations
Hodge Podge
100
What is the unit of Energy?
What is Joules?
100
What is stored energy?
What is potential energy?
100
What is the definition of energy?
The ability to do work.
100
A basketball, with a mass of 2.2 kg, falls off a window ledge, to the ground 50 m below. What is the potential energy of the ball?
PE = mass * gravity * height PE = 2.2 kg * 9.8 m/s (gravity) * 50 m 1,078 Joules
100
What is the definition of work?
A force (a push or pull) applied to an object which forces the object to move.
200
Kinetic energy is _________ energy
What is moving?
200
In a waterfall, potential energy is transferred to ___________
What is kinetic energy?
200
What is the definition of mechanical energy?
The energy of motion or moving parts.
200
You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. What is the kinetic energy of the ball?
KE = 1/2 * mass * speed^2 KE = 1/2 * 2.1 kg * 30 m/s 945 Joules
200
What is the formula for power?
Power = energy transferred / time
300
Kinetic energy of a ball at the bottom of a hill equals________.
What is potential energy at the top?
300
What is the equation for potential energy?
What is PE=mgh?
300
Give an example of elastic potential and elastic kinetic energy.
Answers will vary.
300
A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 kg. Calculate the potential energy of the baby carriage.
PE = mass * gravity * height PE = 12 kg * 9.8 m/s * 21 m 2469.6 Joules
300
List the six types of potential energy.
Gravitational, Chemical, Nuclear, Elastic, Mechanical, Thermal
400
What is the equation for kinetic energy?
KE = 1/2 * mass * speed^2
400
Which of the following represents potential energy? a. a magnificent waterfall flowing down the side of a mountain b. clouds moving across the sky c. stored energy in a bean seed d. a seedling emerging from the soil
C
400
Energy is not lost or created but ___________.
What is transformed?
400
A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. Calculate the kinetic energy of the car.
KE = 1/2 * mass * speed^2 KE = 1/2 * 1120 kg * 40 m/s 896,000 Joules
400
List the five types of kinetic energy.
Radiant, Thermal, Sound, Electrical, Mechanical
500
If a hockey puck is moving at 126.5 m/s with a mass of 0.20 kg. What is the puck's kinetic energy?
1600.23 joules
500
You are about to jump from an airplane 1,000 m above the moon's surface and your mass is 61kg. What is your potential energy?
What is 597,800 J?
500
Give an example of how energy is conserved in a transformation.
Answers will vary.
500
A cinder block is sitting on a platform 20 m high. It weighs 79 kg. Calculate the potential energy of the cinder block.
PE = mass * gravity * height PE = 79 kg * 9.8 m/s * 20 m 15,484 Joules
500
As the height of a ramp increases, potential and kinetic energy will____________________. As mass increases, potential and kinetic energy will ______________________.
Increase and Increase