1. The study of forces is called “Dynamics”.
Abbreviations
A force is……
a push or a pull.
Latin:
Libra
Units: It is measured in …..
pounds (English)
lbs
Newtons (metric) N
The study of forces is called “Dynamics”.

2. n 4. Nuclear Weak Force 3. Nuclear Strong Force 1. GRAVITY
Forces that “act at a distance” and don’t require physical contact are called the “4 fundamental forces”
1. GRAVITY
2. Electromagnetism p n e +
4. Nuclear Weak Force
3. Nuclear Strong Force

3. Contact Forces a.k.a Mechanical Forces
When one object physical touches and moves another

4. Reaction Forces: appear temporarily between surfaces of conatct in reaction to other forces, then vanish.
2. Friction: acts parallel to surfaces of contact
1. NORMAL reaction forces
Act perpendicular to surfaces of contact

5. Forces 4 fundamental forces Reaction Forces: Contact Forces a.k.a
Mechanical Forces