A car is braking and slowing down. a) Which energy store is energy transferred from as the car slows down? Chemical Thermal Gravitational potential Elastic potential Electrostatic Magnetic Nuclear Kinetic b) Which one of the following energy stores is energy mostly transferred to? Chemical Thermal Gravitational potential Elastic potential Electrostatic Magnetic Nuclear Kinetic c) How is this energy transferred? By mechanical work By heating By electrical work By radiation

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A car is braking and slowing down. a) Which energy store is energy transferred from as the car slows down? Chemical Thermal Gravitational potential Elastic potential Electrostatic Magnetic Nuclear Kinetic b) Which one of the following energy stores is energy mostly transferred to? Chemical Thermal Gravitational potential Elastic potential Electrostatic Magnetic Nuclear Kinetic c) How is this energy transferred? By mechanical work By heating By electrical work By radiation

Answer 1

# Explanation: ## Step 1: Part a) of the question is asking from which energy store energy is being transferred as the car slows down. In essence, it's looking for the type of energy that's being depleted in a braking car. In a moving car, this is kinetic energy—energy associated with objects in motion. ### \(Energy_{initial} = Energy_{kinetic}\) ## Step 2: Part b) is seeking to identify where most of the initial kinetic energy goes when a car slows down. The braking system in a car predominantly utilises friction to accomplish deceleration. As the brake operates, it generates heat due to friction, heating up itself and surrounding areas like the wheel disc and the brake pad, so the dissipated energyfrom kinetic to thermal energy and stores it. ### \(Energy_{lost} = Energy_{thermal}\) ## Step 3: Finally in Part C),the question asks which mode of energy transfer is involved - the original store (kinetic) to the one it gets reached (thermal). The method used to shift this energy is the process of heating due to the friction between the brake pads and the disc. ### \(Energy_{transfer method} = Heating\) # Answers: a) Kinetic b) Thermal c) By heating.

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