Kinetic energy

• What is kinetic energy?

  Energy possessed due to motion
• What two factors determine kinetic energy?

  Speed and mass of the object
• How does speed affect kinetic energy?

  Faster objects have more kinetic energy
• How does mass affect kinetic energy when speed is constant?

  More mass means more kinetic energy
• If a particle weighs 0.1 grams and a plane weighs 20 tons, which has more kinetic energy at the same speed?

  The plane has more kinetic energy
• What is the kinetic energy equation?

  $E_k =$$\frac{1}{2} m v^2$
• What does the 'E' in the kinetic energy equation stand for?

  Energy
• What does the 'k' in the kinetic energy equation represent?

  Kinetic energy
• What unit is mass measured in for the kinetic energy equation?

  Kilograms
• What unit is velocity measured in for the kinetic energy equation?

  Meters per second
• How do you convert 20 tons to kilograms?

  20 tons equals 20,000 kilograms
• How do you convert 0.1 grams to kilograms?

  0.1 grams equals 0.0001 kilograms
• What is the kinetic energy of the plane traveling at 5 m/s?

  250,000 joules
• What is the kinetic energy of the particle traveling at 4,000 m/s?

  800 joules
• Why did the particle have less kinetic energy despite its higher speed?

  Its mass was much lower
• What are the key concepts of kinetic energy?

  • Energy due to motion
  • Depends on speed and mass
  • Faster objects have more energy
  • More mass means more energy at constant speed
• How do you calculate kinetic energy using the equation?

  1. Identify mass (m) in kilograms
  2. Identify velocity (v) in meters per second
  3. Use the equation: $E_k =$$\frac{1}{2} m v^2$
  4. Calculate to find kinetic energy in joules