Forces: Forces and Braking.

Question 1

How do we calculate kinetic energy?

Answer 1

• Ek= 1/2xmxv^2
  Mass: Kg.
  Velocity: m/s
• Depends on Velocity squared.
• `

Question 2

What happens to the kinetic energy when a car brakes?

Answer 2

• Kinetic energy is converted into other forms of energy.

- `

Question 3

What happens when the brakes are pressed?

Answer 3

• When brakes are pressed the force of friction acts between the wheels and the brake.
• Causes the kinetic energy of the car to be converted into the thermal energy of the brakes.
• The temperature of the brakes increases and the car slows down loosing it’s kinetic energu.

Question 4

The greater the speed the greater the what?

Answer 4

• Greater braking force needed to stop the car in a certain distance.
• Travelling in High Speeds: Apply large braking force + Causes car to deceelerate rapidly.
• Large amount of kinetic energy is being transferred into the thermal energy of the brakes.
• ## Causes brakes to overheat + Loose control of vehicle.

Question 4

The greater the speed the greater the what?

Answer 4

• Greater braking force needed to stop the car in a certain distance.
• Travelling in High Speeds: Apply large braking force + Causes car to deceelerate rapidly.
• Large amount of kinetic energy is being transferred into the thermal energy of the brakes.
• ## Causes brakes to overheat + Loose control of vehicle.

Question 5

The greater the speed the greater the what?

Answer 5

• Greater braking force needed to stop the car in a certain distance.
• Travelling in High Speeds: Apply large braking force + Causes car to deceelerate rapidly.
• Large amount of kinetic energy is being transferred into the thermal energy of the brakes.
• ## Causes brakes to overheat + Loose control of vehicle.