Work Energy Power NEET MCQs

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WORK, ENERGY AND POWER - COMPLETE FORMULA SHEET

Work

Work by constant force: W = F · s = Fs cosθ
Positive work: force component along displacement.
Negative work: force component opposite displacement.
Zero work: θ = 90^° or displacement is zero.
Variable force: W = ∫_{x_i}^x_f F(x) dx
Work done by gravity: W_g = mg(h_i - h_f)
Work done by spring: W_s = -12k(x_f² - x_i²)

Kinetic Energy

K = 12mv²
Momentum relation: p = mv
K = p²2m
For same K, p ∝ √m
For same p, K ∝ 1m

Work Energy Theorem

Net work: W_net = ΔK
W_net = K_f - K_i = 12m(v² - u²)
Using kinematics: v² = u² + 2as

Potential Energy

Gravitational potential energy: U = mgh
Elastic potential energy: U = 12kx²
Conservative force: F_x = -dUdx
Spring force: F = -kx

Conservation of Mechanical Energy

E_i = E_f
K_i + U_i = K_f + U_f
When non-conservative work acts: W_nc = Δ(K + U)

Power

Average power: P_avg = Wt
Instantaneous power: P = dWdt
P = F · v = Fv cosθ

Collisions

Momentum conservation: m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
Elastic collision: momentum and kinetic energy both conserved.
Inelastic collision: momentum conserved, kinetic energy not conserved.
Coefficient of restitution: e = v₂ - v₁u₁ - u₂
Perfectly inelastic collision: bodies stick together after collision.

Section A

Easy Level MCQs

67 original PDF question snapshots in exact sequence.

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Section B

Moderate Level MCQs

39 original PDF question snapshots in exact sequence.

Question 1Section B

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