Click on the image for a discussion of the definition of weight.
Mass or Weight?
2nd Law:
Σ
F
=
m
a
3rd Law:
F
12
= –
F
21
(interacting pair)
Net force determines
a
Look for Third Law Pairs!
If the forces are equal and opposite why do the rifle and bullet accelerate?
Tug of War!
Back
BEYOND NEWTONIAN PHYSICS:
Electromagnetism (1860)
Special Relativity (1905)-- high speeds
General Relativity (1915)-- large mass
Quantum Physics (1925)-- small objects
FRICTION!
Dark!
