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Physics 1 - Motion, Forces And Conservation Of Energy > Weight And Mass > Flashcards

Flashcards in Weight And Mass Deck (18)
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1

what is weight

the force of gravity acting on an object

2

what is mass

the measure of how many atoms in an object

3

where is the effect of the weight of an object directed towards

the center of the planet it is on (but anything with a large enough gravitational field to give it a weight)

4

formula for calcuating weight

weight = mass * gravity

5

gravitational field strength of Earth

10N/kg

6

what is weight measured in

Newtons (it's a force)

7

how do calculate the weight of something

newtons = kg * N/kg (mass x gravitational field strength)

8

what does 1kg equal in newtons on earth

9.8N

9

how can the of the same object possibly weight change

if the gravitational field strength changes, like another planet

10

what is gravitational potential energy

energy and object posses due to its position in a gravitational field

11

how to calculate the energy an object posses due to its position in a gravitational field

- GPE = KE so i used 5J. (GPE = gravitational potential energy)
- m*g*h (mass x gravitational field strength x height)

12

what is the difference between mass and weight

weight can change depending on the gravitational field strength whereas mass has the same value anywhere

13

why would a 1kg travel a longer distance when thrown with the same force on the moon than on earth

- the moon's gravitational field strength is smaller due to its smaller size and density
- ball weighs 9.8N on earth whereas it weighs 1.6N on the moon
- ball will be lighter on the moon so the same force causes it to move further

14

what is the center of mass of an object

the point at which you assume the whole mass is concentrated, which is at the center of the object, if its density is constant through out

15

what is the relationship between mass and weight

they are directly proportional as an increase in one increases the other

16

explain how the formula triangle and units for weight, mass and gravitational field strength actually make logical sense

- GFS measured in N/kg
- Mass measured in kg (or g)
- Weight measured in N
- multiplying N/kg with kg cancels kg out to leave newtons (weight)
- dividing N by kg can be written as N / kg which is GFS
- dividing N by N/kg can be written as N / (N / kg) and N's cancel out leaving kg (mass)

17

formula for calculating mass

mass = weight / gravitational field strength

18

formula for calculating gravitational field strength

GFS = weight / mass