SP2c - Mass And Weight Flashcards
What is mass?
The quantity of matter in an object
When does the mass of an object change?
If the object it’s self changes
What is weight?
A measure of the pull of gravity on an object
What does weight depend on?
The strength of gravity and mass of an object
Why is weight a vector?
It is a force so it has a direction and has a magnitude
How can weight be measured? Include units
Force meter in newtons
What is the gravitational field strength on earth?
10N/kg
What formula relates weight, mass and gravitational field strength?
Weight N = mass N x gravitational field strength N/kg
A 300 kg space probe lands on Titan where gravitational field strength is 1.4 N/kg
What is the weight?
420 N
On Earth, what forces does a falling object have acting on it?
Air resistance and weight
What does air resistance increase with?
Speed
What happens around 13 seconds into free fall on earth?
The person is moving so fast the air resistance balances the weight and so the speed becomes constant
