1. Power is the rate at which work is done (work per unit time), while work is the transfer of energy by a force acting through a distance.
2. Units for Power: Watts (W) or Joules per second (J/s); Formula for Power: P = W/t
3. Units for Work: Joules (J); Formula for Work: W = F * d * cosθ (or W = Fd for force parallel to displacement)
4. Kinetic energy is the energy an object possesses due to its motion, while potential energy is the stored energy an object has due to its position or configuration.
5. Units for Potential Energy: Joules (J); Formula for Potential Energy: PE = mgh (gravitational) or PE = ½kx² (elastic)
6. Units for Kinetic Energy: Joules (J); Formula for Kinetic Energy: KE = ½mv²
A. Work Problems:
1. W = 2.7 J
2. W = 409 J
3. W = 3150 N * 175.5 m = 552,825 J
4. W = 2470 N * 3000 m = 7,410,000 J
5. W = 3000 N * 150 m = 450,000 J
6. W = 250,000 J
B. Power Problems:
1. P = (600 kg * 9.8 m/s² * 10 m) / 10 s = 5880 W
Parent Tip: Review the logic above to help your child master the concept of work and energy worksheet.
