Newton’s second law of motion
In an experiment, the acceleration can be measured for various values of the resultant force acting on the trolley while its mass is kept constant. On a graph of acceleration against resultant force, a straight line will show that ACCELERATION IS PROPORTIONAL TO THE RESULTANT FORCE.
There is a DIRECT RELATIONSHIP between F and a (a is proportional to F). Also, a and m are INVERSELY PROPORTIONAL.
Inertia, mass and weight
An objects INERTIA depends on its MASS. Mass has only size, with no direction (scalar)
WEIGHT – the force acting on an object due to gravitation.
All masses have a gravitational field around them. A mass is said to have a Gravitational field around it which causes the mass to attract another mass which is close to it. The size of the field depends on the size of the mass and whereabouts in the field you are.
If another mass is put in this field, a force will pull it towards the first mass.
Weight – caused by gravitation. The size of the force varies with the strength of the gravitational field.
MASS IS CONSTANT, WEIGHT VARIES.
WEIGHT - force with both magnitude and direction (vector)
g= F/m, g is N/kg and W = mg