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

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what is weight

the force of gravity acting on an object


what is mass

the measure of how many atoms in an object


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)


formula for calcuating weight

weight = mass * gravity


gravitational field strength of Earth



what is weight measured in

Newtons (it's a force)


how do calculate the weight of something

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


what does 1kg equal in newtons on earth



how can the of the same object possibly weight change

if the gravitational field strength changes, like another planet


what is gravitational potential energy

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


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)


what is the difference between mass and weight

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


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


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


what is the relationship between mass and weight

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


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)


formula for calculating mass

mass = weight / gravitational field strength


formula for calculating gravitational field strength

GFS = weight / mass