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P1: Quiz 1 – Answers
P1: Quiz 1 – Answers
1) Any 5 energy stores from:
2) A system is a single object or a group of objects
3) The four different ways are:
4) When a ball is dropped from a height, energy is transferred from the gravitational potential energy store of the ball to the kinetic energy store of the ball (some energy may also be transferred to the thermal energy store of the ball and the air due to air resistance). It is gravity that does the work, and the energy is transferred mechanically.
5) When a moving car slows down, the brakes use friction to transfer energy from the car’s kinetic energy store to the thermal energy store of the brakes and the surroundings. In this example, it is the brakes that do work as the car slows down
6) When an electric kettle is on, energy is transferred electrically to the thermal energy store of the heating element in the kettle. The heating element then transfers energy from its thermal energy store to the thermal energy store of the water by heating. This results in the energy in the thermal energy store of the water increasing, which causes the temperature of the water to increase.
7) When a car collides with a stationary object, energy is transferred from the car’s kinetic energy store to a few different energy stores, such as the thermal energy stores of the car, the stationary object and the surroundings, the elastic potential energy store of any crumple zones in the car (parts of the car that are designed to crumple during a collision), and some energy will be transferred by sound waves. In this example, it is the normal contact force between the car and the stationary object that does work.
8) The initial force is exerted by the individual throwing the ball. The force comes about because energy is transferred from the chemical energy store in the individual’s arm to the kinetic energy store of the individual’s arm/ hand and ball (the chemical energy store in the individual’s arm is the glucose that is used in the respiration reactions). In this example, it is the force exerted by the individual that does work and the energy is transferred mechanically.
- Thermal energy stores
- Kinetic energy stores
- Elastic potential energy stores
- Gravitational potential energy stores
- Chemical energy stores
- Magnetic energy stores
- Nuclear energy stores
- Electrostatic energy stores
2) A system is a single object or a group of objects
3) The four different ways are:
- Mechanically – a force moving an object through a distance
- Electrically – work done by charges moving due to a potential difference
- Heating – due to temperature differences caused by a chemical reaction or electricity
- Radiation – energy transferred by a wave
4) When a ball is dropped from a height, energy is transferred from the gravitational potential energy store of the ball to the kinetic energy store of the ball (some energy may also be transferred to the thermal energy store of the ball and the air due to air resistance). It is gravity that does the work, and the energy is transferred mechanically.
5) When a moving car slows down, the brakes use friction to transfer energy from the car’s kinetic energy store to the thermal energy store of the brakes and the surroundings. In this example, it is the brakes that do work as the car slows down
6) When an electric kettle is on, energy is transferred electrically to the thermal energy store of the heating element in the kettle. The heating element then transfers energy from its thermal energy store to the thermal energy store of the water by heating. This results in the energy in the thermal energy store of the water increasing, which causes the temperature of the water to increase.
7) When a car collides with a stationary object, energy is transferred from the car’s kinetic energy store to a few different energy stores, such as the thermal energy stores of the car, the stationary object and the surroundings, the elastic potential energy store of any crumple zones in the car (parts of the car that are designed to crumple during a collision), and some energy will be transferred by sound waves. In this example, it is the normal contact force between the car and the stationary object that does work.
8) The initial force is exerted by the individual throwing the ball. The force comes about because energy is transferred from the chemical energy store in the individual’s arm to the kinetic energy store of the individual’s arm/ hand and ball (the chemical energy store in the individual’s arm is the glucose that is used in the respiration reactions). In this example, it is the force exerted by the individual that does work and the energy is transferred mechanically.
Questions
1) Write down 5 different energy stores.
2) What is a system?
3) Write down the four different ways that energy can be transferred between stores in a system. Give a definition of the ways too.
4) Discuss the energy transfers that take place when a ball is dropped from a height.
5) Discuss the energy transfers that take place when a car slows down.
6) Discuss the energy transfers that take place when an electric kettle boils some water.
7) Discuss the energy transfers that take place when there is a collision between a car and a stationary object.
8) Discuss the energy transfers that take place when an individual throws a ball directly upwards using their hand/ arm.
1) Write down 5 different energy stores.
2) What is a system?
3) Write down the four different ways that energy can be transferred between stores in a system. Give a definition of the ways too.
4) Discuss the energy transfers that take place when a ball is dropped from a height.
5) Discuss the energy transfers that take place when a car slows down.
6) Discuss the energy transfers that take place when an electric kettle boils some water.
7) Discuss the energy transfers that take place when there is a collision between a car and a stationary object.
8) Discuss the energy transfers that take place when an individual throws a ball directly upwards using their hand/ arm.