Kinetic Relationship
Define the following: GPE and EPE.
GPE is gravitational potential energy, which is energy stored due to height and EPE is elastic potential energy, which is energy stored when an object is stretched or compressed
Define a system during an experiment.
The object and its environment.
Define energy transfer.
When energy moves from one form to another
Energy is often detected through changes such as motion, heat, light, or sound. What do these observations indicate?
What is energy is present or being transferred?
Astronauts appear to float inside the International Space Station. Is gravity absent there, and why or why not?
What is gravity is still present; astronauts are in continuous free fall while orbiting Earth?
Wassup, I'm Bob. Can you help me with my science homework? No? Well too bad!
If Speed Doubles, KE…
Quadruples
Can energy be created or destroyed? Explain.
Energy cannot be created nor destroyed, only conversed due to the law of conservation.
If a ball rolls off of a counter, is Kinetic energy created.
No, because energy can only be transferred, not created.
Why does increasing speed affect kinetic energy more than increasing mass?
What is speed is squared in the kinetic energy equation?
A hammer and a feather are dropped at the same time on the Moon. Which hits the ground first?
What is they hit the ground at the same time because there is no air resistance?
A graph of kinetic energy vs. mass shows this type of relationship.
What is a linear relationship?
If I eat corn, what energy does my mouth use?
Mechanical Energy (Kinetic)
When a ball rolls down a hill, does the total energy stay the same the whole time. Explain using Kinetic, potential, and thermal energy.
Yes, because the kinetic energy increases as the potential energy decreases, and the thermal energy stays the same from the friction.
A heavier object and a lighter object slide down the same ramp without friction. Which reaches the bottom with greater speed?
What is they reach the bottom with the same speed?
You push a wall with all your strength, but it doesn’t move. According to Newton’s Third Law, what force acts on you?
What is the wall pushes back on you with an equal and opposite force?
Calculate the Kinetic energy of a baseball that just got swung. Its mass is 0.2 kilograms and its velocity is 55 m/s. Describe your process.
302.5 J because the formula is ½ MV^2. 55 squared is 3025, and that times 0.1 equals 302.5.
If there was a giant mountain with Rhode’s closet at the top, and Julian comes rolling out from the top, what would the energy start as and what would it end as.
The energy will start as potential and end as kinetic
If I took a match and lit a fire on it, then threw it into a fireplace, what energy is transferred from the match's fire to the fireplace?
The energy transferred from a burning match to the materials in a fireplace (such as kindling or logs) is primarily thermal energy (heat) and light energy. These energy forms originate from the conversion of the chemical potential energy stored in the match.
Why is it important to define the system when analyzing energy changes?
What is so we know where energy starts, ends, and transfers?
A bowling ball and a tennis ball are dropped from the same height in a vacuum. Which has greater acceleration due to gravity?
What is they have the same acceleration due to gravity?
Two objects have the same mass. Object A moves at 3 m/s and Object B moves at 6 m/s. Compare their kinetic energies.
What is Object B has four times the kinetic energy of Object A?
A system begins with 200 J of gravitational potential energy. Halfway down a ramp, the cart has 120 J of kinetic energy. What likely happened to the remaining energy?
What is some energy transferred to thermal energy due to friction?
1. Porter is running down a hill
2. He hits Millie halfway down the hill
3. Stops moving,
4. Now Millie is rolling down the hill,
5.Millie ends up rolling into a brick wall and stops
Describe the path of the energy.
1. Potential --> KE
2. transfer of KE
3. KE, PE is decreasing as rolling down the hill
4. Thermal or sound as she hits the wall
In real-world systems, why is kinetic energy at the bottom of a ramp often slightly less than the potential energy at the top?
What is energy transfers to thermal energy through friction?
A car moving at 60 mph suddenly brakes and skids to a stop. Which physical concept explains why the car keeps moving forward before stopping?
What is inertia (Newton’s First Law of Motion)?