Energy Equations and Situations

Question 1

How do we solve for kinetic energy?

Answer 1

1/2 mass x velocity^2

Question 2

You are riding a bike on the sidewalk. The bike is going 15 mph. The weight of the bike is 20 kg. What is the kinetic energy for the rider?

Answer 2

2250 Joules

Question 3

Is this situation kinetic or potential energy? A ball sits at the top of a hill.

Answer 3

Potential Energy

Question 4

How do we solve for potential energy?

Answer 4

mass x gravity (9.8) x height

Question 5

A wild horse stands at the top of a cliff. The cliff is 50 meters above sea level. The horse weighs 499 kg. What is the potential energy?

Answer 5

2,445,100 Joules

Question 6

Is this situation kinetic or potential energy? A boy rides a bike down a hill.

Answer 6

Kinetic energy

Question 7

What form of heat transfer is this? At a New Year’s Eve party, Bob lights a sparkler using a candle.

Answer 7

Conduction

Question 8

What is conduction?

Answer 8

Heat transfer between solids

Question 9

What are examples of conduction?

Answer 9

heating a pan on a stove
melting chocolate in your hand feeling a hot cup of coffee
touching a hot seatbelt
using a metal spoon in hot liquid

Question 10

What form of heat transfer is this? Kendall is relaxing at the beach. It is very hot and sunny out. Later, Kendall finds that she has a sunburn from the hot sun’s rays.

Answer 10

Radiation

Question 11

Examples of radiation

Answer 11

electromagnetic radiation
alpha particles
beta particles
gamma rays
X-rays

Question 11

What is radiation?

Answer 11

Heat transfer through electromagnetic waves

Question 12

What form of heat transfer is this? Emerson went to get an espresso from the local coffee shop. She found out that her hands were hot from holding her cup of coffee.

Answer 12

Convection

Question 13

What is convection?

Answer 13

Heat transfer through liquids and gases

Question 14

Examples of convection

Answer 14

Boiling Water
Radiators
Hot Air Balloons
Sea Breezes
Earth’s Mantle Convection