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