Rockets carry satellites into space - OCR Gateway - GCSE Physics - Question 20 - 2021 - Paper 2
Question 20
Rockets carry satellites into space.
(a) Satellites are kept in orbit around a planet by a force.
Name this force?
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Worked Solution & Example Answer:Rockets carry satellites into space - OCR Gateway - GCSE Physics - Question 20 - 2021 - Paper 2
Step 1
Name this force?
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Answer
The force that keeps satellites in orbit around a planet is called gravity.
Step 2
Name the Earth's natural satellite.
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Answer
The Earth's natural satellite is the Moon.
Step 3
Calculate the weight of the Mars Rover vehicle on Mars. State the unit for weight.
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Answer
To calculate the weight of the Mars Rover on Mars, we use the formula:
Gravitational field strength on Mars, g=3.75extN/kg
Thus,
extWeight=185extkgimes3.75extN/kg=693.75extN
Rounding to 3 significant figures, the weight of the Mars Rover is 694 N.
Step 4
Why did the Mars Rover weigh more on Earth than on Mars?
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The Mars Rover weighs more on Earth than on Mars because the gravitational field strength on Earth is greater than that on Mars. Earth's gravitational field strength is approximately 9.81 N/kg, while on Mars it is only 3.75 N/kg, leading to a lower weight on Mars.
