Main content

Forces and Newton's laws of motion

Newton's laws of motion

Learn
Newton's first law of motion introduction
(Opens a modal)
More on Newton's first law of motion
(Opens a modal)
Applying Newton's first law of motion
(Opens a modal)
What is Newton's first law?
(Opens a modal)
Newton's second law of motion
(Opens a modal)
More on Newton's second law
(Opens a modal)
What is Newton's second law?
(Opens a modal)
Newton's third law of motion
(Opens a modal)
More on Newton's third law
(Opens a modal)
What is Newton's third law?
(Opens a modal)
Practice
Newton's first lawGet 5 of 7 questions to level up!
Newton's third law of motionGet 5 of 7 questions to level up!
All of Newton's laws of motionGet 5 of 7 questions to level up!

Normal force and contact force

Learn
Normal force and contact force
(Opens a modal)
What is weight?
(Opens a modal)
Normal force in an elevator
(Opens a modal)
More on Normal force (shoe on floor)
(Opens a modal)
More on Normal force (shoe on wall)
(Opens a modal)
What is normal force?
(Opens a modal)

Balanced and unbalanced forces

Learn
Balanced and unbalanced forces
(Opens a modal)
Unbalanced forces and motion
(Opens a modal)

Slow sock on Lubricon VI

Learn
Slow sock on Lubricon VI
(Opens a modal)
Normal forces on Lubricon VI
(Opens a modal)

Inclined planes and friction

Learn
Inclined plane force components
(Opens a modal)
Ice accelerating down an incline
(Opens a modal)
Force of friction keeping the block stationary
(Opens a modal)
Correction to force of friction keeping the block stationary
(Opens a modal)
Force of friction keeping velocity constant
(Opens a modal)
Intuition on static and kinetic friction comparisons
(Opens a modal)
Static and kinetic friction example
(Opens a modal)
What is friction?
(Opens a modal)
What are inclines?
(Opens a modal)

Tension

Learn
The force of tension
(Opens a modal)
Mild and medium tension
(Opens a modal)
Super hot tension
(Opens a modal)
What is tension?
(Opens a modal)
Introduction to tension
(Opens a modal)
Introduction to tension (part 2)
(Opens a modal)
Tension in an accelerating system and pie in the face
(Opens a modal)

Treating systems

Learn
Treating systems (the hard way)
(Opens a modal)
Treating systems (the easy way)
(Opens a modal)
Two masses hanging from a pulley
(Opens a modal)
Three box system problem
(Opens a modal)
Masses on incline system problem
(Opens a modal)

About this unit

This is the meat of much of classical physics. We think about what a force is and how Newton changed the world's (and possibly your) view of how reality works.