does anyone have the answers for unit 3 test
If you post a few questions with your answers, we'll check them and try to help you.
1.
Which characteristic will be affected by increasing the speed of an object from 30 miles per hour (mph) to 60 mph?
potential energy
gravitational attraction
kinetic energy
mass
2.
Why are turbines for hydroelectric dams located far below the top of the dam?
to ensure that the water does not lose too much kinetic energy before getting to the turbine
to allow the potential energy of the water to increase greatly prior to getting to the turbine
to allow the kinetic energy of the water to increase greatly prior to getting to the turbine
to ensure that the water does not lose too much potential energy before getting to the turbine
3.
Which place is the best choice for a wind farm?
a place near a hydroelectric dam
wind farms are too expensive so we don't have them
a place where wind is high and has the greatest kinetic energy to convert to electric energy
a place where wind is low and has the least kinetic energy to convert to electric energy
4.
A person throws a ball straight up into the air. At which point in the balls path does it have the greatest potential energy (PE)?
when the ball leaves the person's hand
when the ball hits the ground
when the ball reaches its highest point
when the ball is still rising
5.
What is a good description of kinetic energy?
stored energy
conserved energy
energy of motion
energy from the sun
6.
A book is at rest on a flat table. The book is pushed across the table, causing it to move, until it comes to rest again. How does the potential and kinetic energy change during this process?
the potential and kinetic energy decrease as the book comes to rest after being pushed.
the potential and kinetic energy increase as the book comes to rest after being pushed.
The potential energy will stay the same as long as the book stays on the table. The kinetic energy increases as the book is pushed across the table.
The potential energy increases as the book is pushed across the table. The kinetic energy always stays the same.
7.
A mother and a small child are standing on opposite ends of a inflatable bouncy house. The mother jumps up and then comes back down again, transferring her kinetic energy to the child through the floor. How will the motion of the child change?
the child will move up at a faster speed because the child has less mass
the child will move up at a slower speed because the child has more mass
the child will move up at a faster speed because the child has less mass
the child won't move
8.
A student wants to determine the effect of mass on kinetic energy (KE). She will drop two balls of the same size into a pool of water. Which investigative method should the student use?
she should use two balls, of the same size but with same masses, and drop them from different heights
she should use two balls, of the same size but with different masses, and drop them from different heights
she should use two balls, of the same size but with different masses, and drop them from the same height
she should use two balls, of the same size but with same masses, and drop them from same height
9.
Which falling object will result in the LEAST amount of kinetic energy?
a 100 gram rock falling at 10 m/s
a 10 gram rock falling at 1 m/s
a 10 gram rock falling at 15 m/s
a 100 gram rock falling at 1 m/s
10.
As an object falls, how are potential and kinetic energy related?
Both potential energy (PE) and kinetic energy (KE) will increase in the same amount to each other as the object accelerates
potential energy will decrease in the amount equal to the increase in kinetic energy
KE and PE are not related to each other and will increase or decrease independently of each other
The amount of PE and KE will remain the same
11.
Four rivers have the same water flow and volume of water but fall from different heights to a hydroelectric dam. Which dam would provide the MOST hydroelectric power?
Dam B that falls from a height of 75 feet
Dam C that falls from a height of 125 feet
Dam A that falls from a height of 35 feet
Dam D that falls from a height of 175 feet
12.
Water moves through a hydroelectric dam. Which statement describes the changes in energy that occur?
Energy changes from electric to potential to kinetic
Energy changes from potential to electric to kinetic
Energy changes from potential to kinetic to electric
Energy changes from kinetic to potential to electric
13.
An object falls through the ground, gaining speed as it does. A student claims that this creates new energy and so it breaks the law of conservation of energy. Which statement describes why the student is incorrect?
speed is not related to energy in any way
Energy is converted from other forms but not created
equal and opposite amounts of energy are also created
energy can be created without breaking the law of conservation of energy
14.
A student drops a basketball into a pool from 5 meters up. They want to get a bigger splash. What should they do?
use a ball with a greater volume
use a ball with more mass
use a ball with a smaller mass
drop the ball from 2 meters up
15.
Which is a good description of potential energy?
stored energy
energy of motion
energy of reaction
conserved energy
16.
Two objects with equal mass are in motion. Which has the greatest kinetic energy?
the one with the greater speed
the one with the least acceleration
the one with the greater density
the one with less mass
17.
A large truck and a small car are found to have the SAME kinetic energy. How is this possible?
the truck is stopped
the car is moving faster
the car is at the bottom of a hill
the car is moving slower
18.
What is one way to decrease the kinetic energy of an object?
decrease its speed
decrease its volume
increase its weight
increase its mass
19.
Two objects are moving at the same speed. Which has more kinetic energy?
the object that is made of less dense material
the object with less mass
the object with a greater volume
the object with the greater mass
20.
A student drops four objects from a height of 2 meters. Which object will have the greatest kinetic energy?
Tennis Ball = 62.7 grams
Baseball = 147 grams
Small rock = 248.2 grams
Penny = 2.9 grams
tennis ball
baseball
small rock
penny
HELPPP
As an AI language model, I don't have access to specific test answers or any illegal resources. However, I can guide you on how to prepare for a test and suggest tips for studying effectively.
1. Review your study materials: Go through your textbooks, lecture notes, handouts, and any other relevant materials provided by your instructor. Identify key concepts, formulas, and important points that you need to understand.
2. Create a study plan: Organize your studying by creating a schedule or study plan. Break down your study materials into manageable chunks and allocate specific time slots for each topic. This will help you stay organized and ensure you cover all the necessary content.
3. Practice with sample questions: Look for practice questions or past exam papers related to the unit you're studying. Solving these questions will help you familiarize yourself with the format, content, and level of difficulty that you might encounter on the actual test.
4. Seek additional resources: If you're finding certain topics challenging, look for supplementary learning resources such as video tutorials, online forums or study groups, and educational websites. Exploring different explanations and perspectives can enhance your understanding.
5. Ask for help: If you have specific questions or need clarification on certain topics, don't hesitate to reach out to your teacher, classmates, or online communities dedicated to the subject you're studying. Collaborative learning can provide valuable insights and explanations.
Remember, the purpose of a test is to assess your knowledge and understanding of a subject. It is important to study and prepare on your own to genuinely learn the material rather than seek external answers. Good luck with your test preparation!