Physics

>

GCSE

>

Newton's Laws

>

On Mars a ...

Question
# On Mars a persons weight is 0.4 times the weight on Earth. The gravitational field strength of Earth is 9.8. What is the gravitational field strength of Mars.

3 years ago

·

2 Replies

·

1850 views

M

Margarette Mayert

2 Answers

Tom C
Verified Sherpa Tutor ✓

An engaging and encouraging teacher and examiner of maths and physics.

19 reviews

Weight = mass x gravitational field strength.

Mass doesn't change when moved around the universe (unless it goes really fast, but that's relativity and way beyond GCSE level!) so if the Weight on mars is 0.4 time that of earth, then the gravitational field strength is also 0.4 times that of earth.

0.4 x 9.8m/s^2 = 3.92 m/s^2

So the gravitational field strength of Mars is around 3.9m/s^2

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.
S

Sabrina Civiero

The formula for the weight is F=mg where g is the gravitational field related to a specific planet. In this case we have that F_{Mars}=0.4F_{Earth}, so replacing we obtain mg_{Mars}=0.4mg_{Earth}, note that the mass is equal everywhere. Dividing both sides by m, we obtain that g_{Mars}=0.4g_{Earth}=0.4x9.8=3.92

Think you can help?

More Physics GCSE Questions
##
Need
a GCSE
Physics
tutor?

Get started with a free online introductions with an experienced and qualified online tutor on Sherpa.

Find a GCSE Physics Tutor