# PH-UY 1013 Lecture Notes - Lecture 4: Gravitational Field, Terminal Velocity, Normal Force

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## Document Summary

Newton"s first law of motion or law of inertia- the absence of a force leads to no change in motion. If object at rest, stays at rest if in motion, means it speed and direction forever as long as no new force interrupts. Inertia- property of matter that resists change in motion and is proportional to mass. Newton"s second law of motion- acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). Heavier objects require more force to move the same distance as lighter objects. It can be expressed as a mathematical equation: Newton"s third law of motion- for every action there is an equal and opposite re- action. This means that for every force there is a reaction force that is equal in size, but opposite in direction.

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