Kinetic Energy

Kinetic Energy

8.E.13. Analyze graphical displays of data to describe the relationship of mass and velocity of an object to its kinetic energy (KE).

Kinetic Energy

​Factors Affecting Kinetic Energy

• Mass (m): amount of matter in an object

  • The greater the mass, the higher the kinetic energy, if velocity is constant.

  • Example: A truck vs. a bicycle moving at the same speed.

• Velocity (v): rate at which an object changes it position

  • Velocity has a greater impact because it is squared in the formula.

  • Example: Doubling the velocity quadruples the kinetic energy.

Multiple Choice

As mass increases, KE ...

• increases
• decreases
• stays the same

Multiple Choice

Kinetic energy is...

• energy carried in ultraviolet waves

• energy stored in food

• energy in motion

• energy from splitting an atom

Multiple Choice

What two factors affect an object's kinetic energy?

• area and volume

• mass and weight

• weight and height

• mass and speed (velocity)

Multiple Choice

If moving at the same speed (velocity), increasing an object's mass will increase its kinetic energy.

• true

• false

• As the mass increases, the kinetic energy increases. (Linear relationship)

• Mass is on the x-axis. It is the independent variable.

• Kinetic energy is on the y-axis. It is the dependent variable.

​Mass vs Kinetic Energy

Multiple Choice

What would have the greatest kinetic energy?

• A car driving down a hill.
• A person running down a hill. 
• A ball rolling down a hill. 

• ​X-axis: Velocity (m/s)

• Y-axis: Kinetic Energy (Joules)

• Observation: Exponential relationship—as velocity increases, KE increases rapidly.

​Velocity vs Kinetic Energy

Multiple Select

Which of these are examples of kinetic energy? Choose all 3 correct answers!

• running

• sleeping

• walking

• bike riding

Multiple Choice

Calculate the kinetic energy of a moving 4 kg object travelling at a velocity of 3 m/s.

• 18 J
• 36 J
• 12 J
• 6 J

Multiple Choice

How much kinetic energy does a moving 6 kg object have if it moves with a velocity of 3 m/s?

• 27 J
• 18 J
• 9 J
• 2 J