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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Forces, Friction & Equilibrium
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 @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 @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 @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 @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 @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 @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 @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 @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 @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 @shahzad-mahota
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430 Questions
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Shahzad Mahota

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