What is wrong with the statement "this rock weighs 8 kilograms"

Unit of measurement

A unit of measurement is a definite magnitude of a quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement.

The unit of measurement for mass is in Kilograms

While the unit for measurement of weights is in Newton

Explanation:

The given statement "this rock weighs 8 kilograms" is wrong because weight is wrongly mapped to kilograms as it unit.

By right, the correct expression should be

"this rock weighs 8 Newtons"

For more information on the unit of measurement kindly visit

The unit of weight is Newtons.

Explanation:

Mass of an object is the amount of matter contained in the body. It is measured in units of g, kg and mg.

Weight of an object is the force acting on an object by virtue of its mass.

weight=

m = mass

g= acceleration due to gravity

Putting in the values we get,

weight=

Thus weight is expressed in units of Newton in S.I system.

може ли да зареждате повече информация, моля

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied