Motion and Forces
PHYS 101 · Module 2
This module introduces the language of motion and the forces that change motion. Students explore velocity, acceleration, Newton's laws, contact forces, friction, and gravity near Earth's surface.
Lessons in this module
Position velocity and acceleration
Motion is described using position, velocity, and acceleration. This lesson explains these ideas conceptually with simple equations and everyday examples.
Newton's three laws
Newton's laws connect forces to motion. This lesson explains inertia, acceleration from net force, and action-reaction pairs in plain language.
Friction and normal force
Contact forces are central to everyday motion. This lesson explains the normal force, friction, and how surfaces push and resist sliding.
Gravity near Earth
Gravity near Earth's surface gives objects weight and causes falling objects to accelerate downward. This lesson explains weight, free fall, and why mass and weight are not the same.
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