Category 1
Define Energy
The ability of a system to do work or produce heat, and it is measured in Joules (J)
Define Elastic Potential Energy
Energy in an object when it's stretched or compressed, like a rubber band pulled tight or a spring squished down ready to bounce
What is Energy Measured in?
Joules
What is the mass of an object that creates 33,750 J of energy by traveling at a speed of 30 m/s?
75 kg
What is the velocity of a 2.1kg volleyball being served across the net with 945 j of energy?
30 m/s
A skateboarder at the top of a 100m high ramp has 0J of KE and 50,000J of PE. After the skateboarder begins to roll down the ramp they have 20,000J of KE but how many J of PE?
30,000
Define Kinetic Energy
Energy is always conserved and never lost, only converted.
What is the energy of a 4kg apple that is sitting on a 2 m high tree branch?
78.4 J of PE
What is the mass of an apple sitting on a 3m tall counter and 6 J of energy?
.20 kg
What is the proportional relationship between kinetic and potential energy of a falling object?
They always equal the same mechanical energy
A skateboarder at the top of a 100m high ramp has 0J of KE and 50,000J of PE. When at the bottom of the first ramp the skateboarder is now 30m high off the ground. What is the skateboarder'sKE and PE here?
50,000 KE and 0 PE
Define Potential Energy
Stored Energy
What is proportion energy
In a system without non-conservative forces the mechanical energy remains constant; as potential energy increases kinetic energy decreases proportionally and vice versa to keep the energy constant.
An 8kg cinder block is sitting on a 20m high platform on a construction sight. What is the energy of the cinder block sitting on the platform?
1568 J of PE
A 20kg bell is hanging from a tower with 8,550 j of GPE. How far off the ground is the bell hanging?
43.62 m
Explain the proportional relationship between mass, gravity and the height of objects in the amount of GPE of the object. What happens to the GPE if you change the objects height? What about it's mass?
They equal the potential energy, if you change the objects height the GPE gets higher.
A skateboarder at the top of a 100m high ramp has 0J of KE and 50,000J of PE. The skateboarder then flies off the ramp and while for the second they pause at 60m high in the air they have 30,000J of PE. What is there KE?
20,000
Define Gravitational Potential Energy
Energy that depends on the objects height from the ground.
What is Speed
What is the kinetic energy of a bike with a mass of 16kg traveling at 4 m/s
128 J
How high is a .5 kg squirrel sitting if it has 36 J of energy?
7.35 m
Is it possible to increase or decrease the kinetic energy of an object? if so..how?
Yes, by converting potential energy
A skateboarder at the top of a 100m high ramp has 0J of KE and 50,000J of PE. When the skateboarder lands from the jump and continues to ride the skateboard down the block they have how much KE? How much PE?
50,000 KE 0 PE
Define Chemical Potential Energy
Energy stored within the bonds of molecules or atoms, ready to be released or absorbed during chemical reactions.
What is Velocity
Speed with angle
What is the kinetic energy of a 1,120kg car traveling at a speed of 40 m/s?
896,000 J
What is the velocity of a 500 kg elevator that has 4,000 J of kinetic energy?
4 m/s
Does Mechanical energy ever change within a system? Why or Why not?
Yes, if an outside force acts upon it.
What is Dad's phone number in case you had to call him from another phone in an emergency?
334-703-3491