NEET Revision Notes: Newton's Laws of Motion
Subject: Physics | Class 11 Comprehensive Concept & Vector Diagram Guide
1. FUNDAMENTAL LAWS & CORE CONCEPTS
Newton's 1st & 3rd Laws 2nd Law & Impulse Theorem
1st Law: Object maintains velocity unless external net force Fnet = dp/dt = m·a (constant mass).
acts. Impulse J = ∫ F dt = Δp equals the Area under Force–Time
3rd Law: Action-Reaction pairs ( AB F = -F
BA) are equal, graph.
opposite, and act on different objects.
Impulse (F-t Graph) Elevator Frame FBD Atwood Machine
F N
a
Area = Δp m1
m2
t
mg
2. FRICTION & ADVANCED CASE DIAGRAMS
Pulling vs Pushing Block-on-Block System Circular Motion: Banked Road
F (Pull)
N
f_AB Block A
f_k Block B
θ
Physical Setup Key Formula / Reaction Important Notes
• Accel UP: N = m(g + a) Apparent Weight = Normal force N
Elevator Motion • Accel DOWN: N = m(g - a) on balance.
• Free Fall: N = 0 (Weightlessness)
• a = [(m1 - m2)/(m1 + m2)] g Assumes light, frictionless pulley &
Atwood Machine
• T = [2 m1 m2 / (m1 + m2)] g inextensible string.
• Normal Force: N = mg cos θ
Friction opposes motion along slope
Inclined Plane F∥ = mg sin θ
• Parallel Gravity:
(f = μN).
• Acceleration (Smooth): a = g sin θ
NEET Physics Study Guide Newton's Laws of Motion Page 1 of 3
Subject: Physics | Class 11 Comprehensive Concept & Vector Diagram Guide
1. FUNDAMENTAL LAWS & CORE CONCEPTS
Newton's 1st & 3rd Laws 2nd Law & Impulse Theorem
1st Law: Object maintains velocity unless external net force Fnet = dp/dt = m·a (constant mass).
acts. Impulse J = ∫ F dt = Δp equals the Area under Force–Time
3rd Law: Action-Reaction pairs ( AB F = -F
BA) are equal, graph.
opposite, and act on different objects.
Impulse (F-t Graph) Elevator Frame FBD Atwood Machine
F N
a
Area = Δp m1
m2
t
mg
2. FRICTION & ADVANCED CASE DIAGRAMS
Pulling vs Pushing Block-on-Block System Circular Motion: Banked Road
F (Pull)
N
f_AB Block A
f_k Block B
θ
Physical Setup Key Formula / Reaction Important Notes
• Accel UP: N = m(g + a) Apparent Weight = Normal force N
Elevator Motion • Accel DOWN: N = m(g - a) on balance.
• Free Fall: N = 0 (Weightlessness)
• a = [(m1 - m2)/(m1 + m2)] g Assumes light, frictionless pulley &
Atwood Machine
• T = [2 m1 m2 / (m1 + m2)] g inextensible string.
• Normal Force: N = mg cos θ
Friction opposes motion along slope
Inclined Plane F∥ = mg sin θ
• Parallel Gravity:
(f = μN).
• Acceleration (Smooth): a = g sin θ
NEET Physics Study Guide Newton's Laws of Motion Page 1 of 3
