Sir Isaac Newton and Forces. Physicists 1643-1727. The Telescope.
With no outside force the ball will never move
The relationship between an object's mass, its acceleration , and the applied force F is F = ma.
When the net force acting on an object is zero then it will accelerate with the
More force more acceleration
Reaction force of the book to the apple
Force of attraction between the apple and the earth
Ex. Heat a thermometer and record the rate the temperature drops