Test – Energy – 1

Define energy and state its standard unit of measurement.

List four different types of energy stores and give an example of each.

Explain the difference between an energy store and an energy transfer pathway.

Describe the energy transfers that occur when a student uses a battery-powered calculator.

A ball with a mass of 0.5 kg is dropped from a height of 20 m. Calculate the gravitational potential energy of the ball before it is dropped. (g = 9.8 N/kg)

A car with a mass of 1500 kg is traveling at a speed of 20 m/s. Calculate its kinetic energy.

Explain why the kinetic energy of an object quadruples when its speed doubles.

A box with a mass of 25 kg is lifted from the ground to a height of 1.8 m. Calculate how much gravitational potential energy it gains. (g = 9.8 N/kg)

A cyclist and bicycle have a combined mass of 80 kg. If the cyclist is traveling at 5 m/s, calculate their kinetic energy.

When a pendulum swings, describe the energy transfers that take place throughout its motion.

An athlete with a mass of 60 kg runs up a flight of stairs that is 3 m high in 4 seconds. Calculate:

1. The gravitational potential energy gained by the athlete
2. The power developed by the athlete (power = energy/time)

A ball with a mass of 0.2 kg is thrown vertically upward with a speed of 15 m/s. Calculate:

1. The initial kinetic energy of the ball
2. The maximum height the ball will reach (ignore air resistance)

A roller coaster car has a mass of 500 kg and is at the top of a 40 m high hill. Calculate its gravitational potential energy at this point. As it descends and reaches the bottom of the hill, what is its theoretical maximum speed? (Ignore friction and air resistance, g = 9.8 N/kg)

Explain what happens to the energy in a light bulb. Why is a light bulb not 100% efficient?

A toy car with a mass of 0.3 kg is pushed along a horizontal surface and reaches a speed of 2 m/s. It then goes up a slope and comes to a stop. Calculate:

1. The initial kinetic energy of the car
2. The height it will reach on the slope (ignore friction, g = 9.8 N/kg)