FIGURE A
The floor pushes upward on the person. Gravity pulls downwards on the person.
What is the net force acting on the person?
FIGURE B
An object at rest will remain at rest.. Unless acted on by unbalanced force.. An object in motion will continue with constant speed and direction... Unless acted on by an unbalanced force.
What is required for the object (ball) to change its motion?
What will happen to the objects (Ball and person) if the forces acting on them are balanced?
What causes an object to change its motion?
FIGURE C
To get the wagon to be in motion PULL or PUSH (Force) must be applied. If the mass of the wagon increases a greater PULL or PUSH (Force) is necessary to move it.
How can you describe the relationship between the intertia and Mass of an object?