Comb Sci: Energy 2

​Watch this video (1 min)

Make sure to understand:

• ​The different forms of energy.

Multiple Choice

Which is an example of light energy?

• lawn mower

• blender

• flash light

• speaker

Multiple Choice

A computer uses what type of energy to operate?

• Mechanical

• Light

• Electric

• Sound

Multiple Choice

What is an example of sound energy?

• headphones

• traffic light

• sun

• bicycle

Multiple Choice

When you eat fruits and vegetables, chemical bonds are releasing stored energy, this is...

• a. thermal energy

• b. sound energy

• c. electrical energy

• d. chemical energy

Multiple Choice

a.  Energy stored in the nucleus of an atom.

• A. Sound Energy
• B. Potential Energy
• C. Nuclear Energy
• D. Thermal energy

Multiple Choice

Heat energy is also called ______ energy.

• chemical

• electrical

• mechanical

• thermal

​Watch this video (2 mins)

Make sure to understand:

• What is kinetic energy?

• How to calculate kinetic energy?

• How does speed affect kinetic energy?

• How does mass affect kinetic energy?

Multiple Choice

Energy in motion is:

• Potential Energy

• Heat Energy

• Electric

• Kinetic Energy

Multiple Choice

A girl on a motorbike passes by at a speed of 15 m/s. Her mass is 40 kg. What is her kinetic energy? 

• 300 Joules
• 600 Joules
• 950 Joules
• 4500 Joules

Multiple Choice

Calculate the kinetic energy of a 2 kg rock that rolls down the hill with a velocity of 8 m/s.

• 64 Joules
• 16 Joules
• 128 Joules
• 8 Joules

Multiple Choice

Which skier has the greatest kinetic energy?

• Skier A
• Skier B
• Skier C
• Skier D

Multiple Choice

Calculate the kinetic energy of a car which has a mass of 1000 kg and is moving at the rate of 20 m/s.

• 200,000 Joules
• 20,000 Joules
• 10,000 Joules
• 40,000 Joules

​Watch this video (5 mins)

Make sure to understand:

• What is potential energy?

• ​What is gravitational potential energy?

• How to calculate gravitational potential energy?

• How does height affect gravitational potential energy?

• How does mass affect gravitational potential energy?

Multiple Choice

Which of the following is the correct equation for calculating an object's gravitational potential energy?

• PE = mgh

• PE = mg / h

• PE = mg + h

• PE = gh

Multiple Choice

Calculate the gravitational potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high.

• 14,553 Joules
• 1,485 Joules
• 2 Joules
• 743 Joules

Multiple Choice

At which position does the child on the swing have the most gravitational potential energy?

• W

• X

• Y

• Z

Multiple Choice

You throw a ball into the air as shown in the diagram. At what point does the ball have the most gravitational potential energy?

• W

• X

• Y

• Z

Multiple Choice

Which would have the LEAST gravitational potential energy (GPE)?

• A ball sitting on the ground

• Moon viewed from the Earth

• An airplane flying 30,000 feet above the ground

• A rock sitting on top of Mt. Everest