Kinetic energy

• What is kinetic energy?

  Kinetic energy is the energy that an object possesses due to its motion.
• What determines the kinetic energy of an object?

  • Mass of the object
  • Speed of the object
• How does the speed of an object affect its kinetic energy?

  The faster an object is moving, the more kinetic energy it will have.
• How does the mass of an object affect its kinetic energy?

  The more mass an object has, the more kinetic energy it will have (provided speed remains equal).
• What is the equation used to calculate kinetic energy?

  $E_k =$$\frac{1}{2}mv^2$
• What do the symbols in the kinetic energy equation represent?

  • $E_k:$ Kinetic energy
  • $m:$ Mass (in kilograms)
  • $v:$ Velocity (in meters per second)
• How many kilograms are there in 20 tons?

  20,000 kilograms
• How many kilograms are there in 0.1 grams?

  0.0001 kilograms
• What is the kinetic energy of the plane if it has a mass of 20,000 kilograms and a speed of 5 meters per second?

  250,000 joules
• What unit is kinetic energy measured in?

  Joules
• How can 250,000 joules be rewritten using kilojoules?

  250 kilojoules
• What is the kinetic energy of the particle if it has a mass of 0.0001 kilograms and a speed of 4,000 meters per second?

  800 joules
• Why does the particle have less kinetic energy than the plane despite traveling much faster?

  Its kinetic energy is determined by its mass, which is so much lower than the plane's, outweighing the effect of its higher speed.
• What is the equation to calculate kinetic energy?

  $E_k =$$\frac{1}{2}mv^2$
• What does kinetic energy depend on?

  • Speed of the object
  • Mass of the object
• If two objects have the same speed, how does their mass affect their kinetic energy?

  • An object with more mass will have more kinetic energy.
  • An object with less mass will have less kinetic energy.
• What are the units of mass and velocity in the kinetic energy equation?

  • Mass: Kilograms (kg)
  • Velocity: Meters per second (m/s)
• How many kilograms are there in one tonne?

  1000 kilograms
• What are the steps involved in calculating kinetic energy?

  1. Convert all units to SI units (kilograms for mass, meters per second for velocity).
  2. Substitute the values into the kinetic energy equation: $E_k =$$\frac{1}{2}mv^2.$
  3. Calculate the kinetic energy.
• What does 'k' mean when writing kinetic energy as 250 kJ?

  'k' stands for kilo, meaning 1000 joules.
• Despite having a much lower speed, how can a particle have less kinetic energy than a plane?

  Because its mass is much smaller, its kinetic energy is lower despite having a higher speed.