Kinetic energy

• What is kinetic energy?

  The energy an object possesses due to its motion
• What two factors determine the amount of kinetic energy an object has?

  Its speed and its mass
• How does speed affect kinetic energy?

  The faster an object is moving, the more kinetic energy it has
• How does mass affect kinetic energy when speed is constant?

  The more mass an object has, the more kinetic energy it has
• 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 much more kinetic energy due to its larger mass
• What is the equation for calculating kinetic energy?

  e_k = \frac{1}{2} m v^2
• What does the symbol 'e_k' represent in the kinetic energy equation?

  Kinetic energy
• What does 'm' represent in the kinetic energy equation?

  Mass measured in kilograms
• What does 'v' represent in the kinetic energy equation?

  Velocity measured in 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 with a mass of 20,000 kg?

  250,000 joules or 250 kilojoules
• What is the kinetic energy of the particle traveling at 4,000 m/s with a mass of 0.0001 kg?

  800 joules or 0.8 kilojoules
• Why did the particle have less kinetic energy than the plane despite traveling faster?

  Because the particle had a much lower mass
• How do you ensure values are in the correct units for kinetic energy calculations?

  • Convert tons to kilograms (1 ton = 1,000 kg).
  • Convert grams to kilograms (divide grams by 1,000).
• What is the relationship between speed, mass, and kinetic energy?

  • Kinetic energy depends on speed and mass.
  • Faster speed increases kinetic energy.
  • Greater mass increases kinetic energy if speed is constant.