IGCSE Coordinated Science: Mass and Weight Mass and Weight 1. Difference between Mass and Weight ❖ Weight is the gravitational pull on an object measured in Newtons because it is the amount of the force. This is different on differentplanets because the gravitational pull is different because of thedifferent mass of the planet. ❖ Mass is the amount of particles in a substance. This is the sameregardless of how much gravitational pull is applied to the objectbecause the amount of particles of in an amount of substance. The weight is the gravitational constant multiplied by the mass. 2. Demonstrate understanding that mass is a property that ‘resists’ change inmotion. This is the concept of inertia. If a force is applied to an object, it will notimmediately reach a high speed because it requires time to accelerate, asshown by the formula F=ma. If the force is constantly applied then there is aconstant acceleration. However if the force is not constant and only applied inan instant then there will be an instant of acceleration and then it will taketime for the object to speed up. 3. Know that the Earth is the source of a gravitational ﬁeld. Gravity is an attractive force created by the presence of mass. Any object witha mass with have a gravitational ﬁeld. The more mass an object has thestronger the gravitational energy it holds. 4. Describe, and use the concept of, weight as the effect of a gravitationalﬁeld on a mass.
As mentioned before the weight of an object is the gravitational force appliedonto it multiplied by the mass. W = m x g (N) = (kg) (m/s²)