Kinetic energy affects which aspects of a vehicle's motion?

Kinetic energy affects which aspects of a vehicle's motion?

• A. Only forward motion
• B. Only stopping
• C. Both forward motion and stopping
• D. Neither

Answer: (C)

Kinetic energy is the energy of motion, given by KE = 1/2 m v^2. Any change in the vehicle’s motion—speeding up or slowing down—requires changing this energy. When you accelerate, you increase kinetic energy, so forward motion is affected by how much energy you have. When you brake, you must remove that energy so the vehicle can stop; brakes convert kinetic energy into heat and other forms of energy, and the amount to dissipate grows with speed (and mass). Because more energy to remove means longer stopping distances, kinetic energy influences both how fast the vehicle is moving and how hard it is to bring it to a stop.

Kinetic energy is the energy of motion, given by KE = 1/2 m v^2. Any change in the vehicle’s motion—speeding up or slowing down—requires changing this energy. When you accelerate, you increase kinetic energy, so forward motion is affected by how much energy you have. When you brake, you must remove that energy so the vehicle can stop; brakes convert kinetic energy into heat and other forms of energy, and the amount to dissipate grows with speed (and mass). Because more energy to remove means longer stopping distances, kinetic energy influences both how fast the vehicle is moving and how hard it is to bring it to a stop.