Forces, Friction & Equilibrium

Apply free-body thinking to friction and statics basics. Ideal for students preparing board exams and competitive tests.

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QUESTION NO 01

Hooke's law states that within elastic limit, stress is proportional to?

Answer: Strain

Stress ∝ strain (Hooke's law) within the elastic limit.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 02

Angular momentum of a particle is?

Answer: r × p

L = r × p for a particle about a point.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 03

Moment of inertia depends on?

Answer: Mass distribution about the axis

I depends on how mass is distributed relative to the rotation axis.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 04

For free fall (neglecting air resistance), acceleration is?

Answer: g downward

All freely falling objects accelerate at g ≈ 9.8 m/s² downward.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 05

Weight of a body is?

Answer: mg

Weight W = mg near Earth's surface.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 06

The slope of a velocity–time graph gives?

Answer: Acceleration

a = dv/dt, so the slope of v–t is acceleration.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 07

Friction always acts?

Answer: Opposite to the relative motion (or tendency)

Kinetic friction opposes relative sliding; static friction opposes the tendency to slide.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 08

In an elastic collision,

Answer: Both momentum and kinetic energy are conserved

Perfectly elastic collisions conserve both momentum and kinetic energy.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 09

Power is defined as?

Answer: Rate of doing work

Power P = W/t (or F·v).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 10

Escape velocity from Earth's surface is approximately?

Answer: 11.2 km/s

Escape speed from Earth is about 11.2 km/s.

Shahzad Mahota @shahzad-mahota

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Forces, Friction & Equilibrium

Hooke's law states that within elastic limit, stress is proportional to?

Angular momentum of a particle is?

Moment of inertia depends on?

For free fall (neglecting air resistance), acceleration is?

Weight of a body is?

The slope of a velocity–time graph gives?

Friction always acts?

In an elastic collision,

Power is defined as?

Escape velocity from Earth's surface is approximately?

Published By

Shahzad Mahota

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00

00

00

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Forces, Friction & Equilibrium

Hooke's law states that within elastic limit, stress is proportional to?

Explanation

Angular momentum of a particle is?

Explanation

Moment of inertia depends on?

Explanation

For free fall (neglecting air resistance), acceleration is?

Explanation

Weight of a body is?

Explanation

The slope of a velocity–time graph gives?

Explanation

Friction always acts?

Explanation

In an elastic collision,

Explanation

Power is defined as?

Explanation

Escape velocity from Earth's surface is approximately?

Explanation

Published By

Shahzad Mahota

00

00

00

00

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