Force and Braking

• What should you be able to describe by the end of the video?

  Energy changes during braking, potential dangers of large decelerations, and estimating forces in deceleration.
• What is the stopping distance of a car composed of?

  • Thinking distance
  • Braking distance
• How does the speed of a car affect its braking distance?

  Higher speed results in a longer braking distance.
• What is the formula for calculating kinetic energy?

  $KE =$$\frac{1}{2}mv^2$
• Why is it important to learn the kinetic energy formula for the exam?

  Because it is not given in the exam.
• How does doubling the velocity of a car affect its kinetic energy?

  The kinetic energy quadruples.
• What happens to the kinetic energy of a car when it brakes to a stop?

  • Kinetic energy is converted into other forms of energy
  • Primarily converted to thermal energy in the brakes
• What causes the temperature of the brakes to increase during braking?

  Conversion of kinetic energy to thermal energy.
• What is the relationship between speed and braking force needed to stop a car?

  Greater speed requires a larger braking force.
• What can happen if a large braking force is applied?

  Brakes can overheat and the driver may lose control.
• How long does it take for the car to decelerate to zero?

  10 seconds
• How do you calculate the force needed for the car's deceleration?

  Multiply mass by acceleration.
• What force is calculated for the deceleration of the car?

  3,000 Newtons
• Where can students find more questions on forces involved during braking?

  In the revision workbook linked in the video.