CA Remediation AKS 7a/7b

AKS 7a - Energy Transformations

AKS 7B - Potential and Kinetic Energy

What is Kinetic Energy?

Kinetic Energy is energy of motion.

An object gets kinetic energy from its mass and velocity. An object with kinetic energy has energy stored in motion.

Kinetic energy (video) | Energy | Khan Academy

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Multiple Choice

According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 

• destroyed, destroyed
• created, saved
• created, destroyed
• lost, found

Potential Energy

Potential Energy is energy of position.

An object gets potential energy from height, mass and gravity. An object with potential energy has the potential to do work. This potential is only released when the object falls.

Multiple Choice

A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement best describes the energy changes that occurred? 

• The chemical energy stored in the match changed to thermal energy and light energy.   
• The thermal energy stored in the match changed to light energy and chemical energy. 
• The light energy and thermal energy stored in the match changed to mechanical energy. 
• The light energy and thermal energy stored in the match changed to chemical energy. 

Potential energy (video) | Energy | Khan Academy

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Multiple Choice

When a lion eats a zebra and then uses the energy from the zebra to run, the lion’s body converts — 

• chemical energy to mechanical energy 
• electrical energy to chemical energy 
• chemical energy to light energy 
• mechanical energy to chemical energy 

Multiple Choice

An object that is NOT moving has _________ energy.

• kinetic

• potential

Multiple Choice

The diagram below shows a hot air balloon rising. Propane gas tanks are seen at the bottom of the balloon.  What energy transformations occur when propane gas is used to lift the balloon? 

• Mechanical to light to chemical
  
• Chemical to mechanical to thermal 
• Thermal to chemical to light
  
• Chemical to thermal to mechanical 

Multiple Choice

An object that is moving has _________ energy.

• kinetic

• potential

Multiple Choice

The blades of a toy helicopter spin when its circuit is connected to a battery. Which sequence below correctly identifies the energy changes taking place in the helicopter?

• chemical to electrical to potential

• chemical to electrical to mechanical

Multiple Choice

Which letter shows the ball when it has MAXIMUM kinetic energy?

• A

• C

• D

• G

Multiple Choice

1. A student investigated the energy transformations that occur when a call is placed from cell phone A and received by cell phone B. The student drew a diagram to show the process. Based on the diagram, what evidence is there for the transformation of chemical energy into electrical energy, and which other energy transformations must occur for the call to be received by cell phone B?

• Evidence:

  Cell phones are powered by a battery that produces the electricity used to send or receive a call.

  Transformation 1: Sound energy is transformed into

  electrical energy by cell phone A.

  Transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station

• Evidence:

  Cell phones are powered by a battery that produces the electricity used to send or receive a call.

  Transformation 1: Sound energy is transformed into

  electromagnetic waves by cell phone A.

  Transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B.

• Evidence:

  Base stations are powered by a battery that produces the electricity used to receive and forward a call.

  Transformation 1: Sound energy is transformed into electrical energy by cell phone A.

  Transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station

• Evidence:

  Base stations are powered by a battery that produces the electricity used to receive and forward a call.

  Transformation 1: Sound energy is transformed into electromagnetic waves by cell phone A.

  Transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B

Multiple Choice

Which letter shows the ball when it has MAXIMUM potential energy?

• A

• B

• D

• G

Multiple Choice

Which letter shows the ball when it has the LEAST potential energy?

• A

• B

• D

• G

Multiple Choice

a boy riding a bike has this type of ENERGY

• Gravitational Potential

• chemical

• elastic

• mechanical

Multiple Choice

Which letter shows the ball when it has the LEAST KINETIC energy?

• A

• B

• D

• G

​Formula for finding kinetic energy

(it is in your notes from Monday)

​Energy has a unit of Joules (J).

Multiple Choice

a ball on the top of a building has this type of ENERGY

• Electrical

• Sound

• Thermal

• Gravitational Potential Energy

Multiple Choice

You serve a volleyball with a mass of 2 kg.

The ball leaves your hand with a speed of 30 m/s.

The ball has kinetic energy.

Calculate it.

• 60 J

• 1800 J

• 900 J

Multiple Choice

A car is traveling with a velocity of 20 m/s and has a weight (mass) of 1000 kg. What type of energy does the car have?

• kinetic

• potential

Multiple Choice

A car is traveling with a velocity of 20 m/s and has a weight (mass) of 1000 kg. Calculate how much kinetic energy the car has.

• 200,000 J

• 100,000 J

• 400,000 J

Multiple Choice

At point B, the energy is ______.

• Potential

• Kinetic

• Thermal

• Chemical

​Formula for finding potential energy

(it is in your notes from Monday)

Multiple Choice

What type of energy is being used?

• electromagnetic

• mechanical

• thermal

• sound

Multiple Choice

A baby carriage is sitting at the top of a hill that is 20 m high.

The carriage with the baby in it weighs 40 kg.

What type of energy does this baby carriage have?

• kinetic

• potential

Multiple Choice

Which 2 letters have the most kinetic energy

• W & Y

• X & Z

Multiple Choice

A baby carriage is sitting at the top of a hill that is 20 m high.

The carriage with the baby in it weighs 40 kg.

Calculate how much potential energy the carriage with baby has?

• 800 J

• 8000 J

• 80 J

Multiple Choice

There is a bell at the top of a tower that is 20 m high.

The bell weighs 100 kg. The bell has potential energy.

Calculate it.

• 20,000 J

• 2000 J

• 200,000 J

Multiple Choice

A fire is an example of what kind of ENERGY?

• Nuclear

• Sound

• Thermal

• Chamical

Multiple Choice

gasoline has this type of ENERGY

• chemical

• nuclear

• gravitational potential

• electromagnetic

Multiple Choice

power lines are an example of this type of ENERGY

• sound

• mechanical

• electrical

• nuclear

Multiple Choice

A car speaker is an example of this type of ENERGY

• Thermal

• Nuclear

• Elastic

• Sound

Multiple Choice

a microwave has this type of ENERGY

• electromagnetic

• sound

• thermal

• elastic

Multiple Choice

What energy conversions take place when you vigorously rub your hands together?

• Mechanical => light

• chemical => thermal

• mechanical => thermal

• kinetic => chemical

Multiple Choice

Which kind of energy change occurs when a candle is burning?

• Chemical to light.
• Light to electrical.
• Solar to heat.
• Chemical to electrical.

Multiple Choice

Which type of energy transformation occurs when a flashlight shines?

• chemical → thermal → electrical
• chemical → electrical → light
• thermal → chemical → light
• chemical → electrical → chemical

Multiple Choice

What type of energy is food energy stored in your muscles?

• mechanical

• nuclear

• thermal

• chemical

Multiple Choice

Which type of energy propels a baseball after it has been struck by a bat?

• chemical

• thermal

• mechanical

• nuclear

Multiple Choice

A television works by transforming electrical energy into what other kinds of energy?

• Light, thermal, and sound
• Thermal, chemical, and solar
• Sound, mechanical, and electrical
• Light, chemical, and mechanical

Multiple Choice

Electrical Energy is transferred to _____ Energy.

• Solar
• Mechanical
• Chemical
• Electrical

Multiple Choice

Solar Energy is transferred to _____ Energy.

• Mechanical
• Solar
• Sound
• Electrical