The diagram shows a water flyboarder resting on a flat floating platform.
The flyboarder is completely stationary on the platform before turning on the water jets.
What are the names of the upwards force and the downwards force acting on the flyboarder?
Use words from the list:
- normal contact force
- tension
- thrust
- weight
- drag
Upwards force: ………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots………………………………
Downwards force: ………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots………………………………
The flyboarder lifts off the platform when the jetpack nozzles eject high-pressure water downwards.
Explain how Newton's third law applies to the flyboarder and jetpack system as it lifts off.
Use ideas about the force of the jetpack on the water and the force of the water on the jetpack.
…………………………………………………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………………………………………………
Describe the conditions needed for the flyboarder to accelerate upwards.
Use ideas about the upwards force (thrust) and the downwards force (weight).
…………………………………………………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………………………………………………
The flyboarder and their equipment have a combined mass of 80 kg80\text{ kg}80 kg and rise a vertical distance of 15 m15\text{ m}15 m.
Calculate the gravitational potential energy gained by the flyboarder and their equipment.
Use the equation: gravitational potential energy=mass×gravitational field strength×height\text{gravitational potential energy} = \text{mass} \times \text{gravitational field strength} \times \text{height}gravitational potential energy=mass×gravitational field strength×height
Gravitational field strength = 9.8 N/kg9.8\text{ N/kg}9.8 N/kg
Gravitational potential energy = ………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots……………………………… J\text{J}J
A different flyboarder's jetpack does 18000 J18000\text{ J}18000 J of work in 8 seconds8\text{ seconds}8 seconds as they rise upwards.
Calculate the power of this jetpack.
Use the equation: power=work donetime\text{power} = \frac{\text{work done}}{\text{time}}power=timework done
Include the correct unit.
Power = ………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots……………………………… Unit …………\dots\dots\dots\dots…………
A student writes a summary about gravitational fields.
The student has made two mistakes in their summary.
Gravitational Fields
Gravitational field strength increases as you move further away from a planet's center.
Gravitational forces can be both attractive and repulsive.
Any object with mass creates its own gravitational field.
Identify the two mistakes and write down the correct word or phrase for each mistake.
Mistake 1: ………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots………………………………………………
Correct word/phrase 1: ………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots………………………………………………
Mistake 2: ………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots………………………………………………
Correct word/phrase 2: ………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots………………………………………………