Dynamics - Forces

Force and Motion

Question For You: What causes an object to start moving, change speed, or alter its direction? Define Kinematics, Dynamics, Force. Give applications and example of force

Types of Forces

Question For You: Describe Types of forces i.e. contact forces and non contact forces in detail

Question For You: Write down categories of fundamental forces of nature
On what bases this classification is made? Write down Froce mediators or exchange particles

Strong Nuclear Force

Question For You: Write a short note on strong nuclear force.

Electromagnetic Force

Question For You: Write a short note on electromagnetic force.

Gravitational Force

Question For You: Write a short note on gravitational force.

Weak Nuclear Force

Question For You: Write a short note on weak nuclear force.

Force	Range (metre)	Relative strength	Function	Exchange Particles
Strong Force	10⁻¹⁵ (diameter of proton)	1	Binds protons and neutrons in nuclei Strongest of all forces	Pions (Π) or others
Electromagnetic Force	infinite	7.3 x 10⁻³	Acts between charged particles Can be attractive or repulsive	Photons (massless)
Weak Force	10^-17	10^-5	Responsible for radioactive decay Short-range force	W+, W-, Z₀ (vector bosons)
Gravitational Force	infinite	6 x 10⁻³⁹	Attractive force between masses Long-range force	graviton (not yet detected)

Question For You: Write a short note on unification of forces.

Force Diagrams

Question For You: Write a short note on concept of force diagram.

Concept of Net Force

Applied Force

(a)

10N

20N

(b)

20N

40N

(c)

25N

Resultant (Net) Force

30N

20N

zero resultant

Question For You: Write a short note on concept of net forces in detail.