Midpoint Unit D Study Guide Flashcards
1)A student demostrates the relationship b/w GPE and KE by sliding a cart along a curved ramp shown below (in the study guide). Where is the most GPE? most KE?
GPE:1. KE: 3
3)Mario conducted an experiment to determine the effects of mass and height on GPE. He hypnotized that the higher off the ground the television was raised, the greater gravitational potential energy(GPE) of the television. His results are recorded in a table. Is his hypothesis supported? Explain.
Yes because the gravitational potential energy increased as the height from the floor
2) Describe the energy transfer invovled with an open refrigerator door.
The thermal energy in the air outside of the refrigerator is transferred to the inside of the refrigerator causing items to become warmer
4) Chris pushes a marble down a ramp. She measured and records the distance that it slides. Chris’s friend, Jade, wants to conduct a simliar experiment but he wants to increase the KE of the marble in his experiment. What would he need to change in his experiment to make sure his marble has MORE KE than Chris’s
-make the marble more thick and make the ramp higher/steeper/taller
Repetition
When your doing the experiment multiple times
Replication
When someone else is doing the experiment
7) A ball is dropped from rest from Point 1. By the time it reaches Point 2, it has gained 2 J(jewls) of KE. As it contiunes its fall from Point 2 to Point 3, its KE increases by another 6 J. What is the ball change in GPE as it falls from Point 1 to Point 3??
A decrease of 8 J
8) The table below in study guide records the chemical and thermal energy of a system before and after a chemical reaction takes place. Explain how this data shown in study guide demonstrates the law of conservation of energy.
The total enegry before the reaction is the same for before and after
9) Bob’s hypothesis was that the KE of a falling object would be unaffected by the height from which it was dropped. To test his hypothesis, he dropped a metal ball weighing .005 kg from 3 differeny heights and measured the velocity at impact. He then used his results to calculate the maximum KE of the ball. (Results shown of the experiment on study guide). Although his hypothesis is NOT supported, what can be concluded from the data he collected??
Falling objects increases in velocity and kinetic energy as it drops from a higher height
Angela conducts an experiment to test the effect of ramp surface on a car’s KE at the finish line. For each trial, she uses ramps with differeny surfaces. Angela uses a different type of car for each trial. She measure the mass of each car and their velocities at the finish line. What should she change in her investgation in order to achieve more valid results?
Make each car the same and different ramps
Treshaun wrote steps to show the energy transformations involved in producing, eating, and digesting food. Which steps shows an INCORRECT transformation
A) radiant energy from the sun changes to chemial energy in a plant
B) after an animal eats a plant, chemical energy changes to thermal energy
C) when an animal eats a plant, chemical energy in the plant changes to radiant energy from the sun
D) in the animal’s body, chemical energy is converted into mechancial energy when its used for muscle movement
C) when an animal eats a plant, chemical energy in the plant changes to radiant energy from the sun
The graph (on study guide) shows the production and usage of petroleum in the US for transportation. According to the graph, which of the following decisions is the US gov most likely to make??
A) stop producing petroleum for vehicles
B) seek alternatives forms of energy for vehicles
C) increase the number of vehicles on the road
D) double the number of vehicles sold in the US
B) seek alternatives forms of energy for vehicles
The efficency of an avg gasoline powered go cart is about 20%. What does this mean?
The car uses 20% of the energy stored in the gasoline for motion
What energy transformation takes place when a radio is plugged in and turned on?
Electrical energy transformed to sound energy
