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Physics Practice Questions on Force, Pressure, and Gravitation

This lecture covers key multiple-choice and numerical questions on force, work, pressure, gravitation, and levers for the UP Super TET teaching exam. Concepts explained include work done by vector dot products, pressure formula calculations, variation of gravitational acceleration, mass versus weight, and Archimedes' principle.

Teaching
Physics
English · 7 topics
Checked against the video on 25 Oct 2026

Made by AI from the YouTube video UP SUPERTET SCIENCE Class-5 | बल (FORCE) | NUMERICAL & MCQ | उ.प्र. प्राथमिक शिक्षक भर्ती 2026 (opens YouTube in a new tab) by Balaji Study Adda, then checked against it. All credit for the teaching goes to the creator. Tap a topic’s time to confirm a fact in the video.

Physics Practice Questions on Force, Pressure, and Gravitation

English7 topics · 6 MCQs · 11 flashcardsWatch the video (opens YouTube in a new tab)

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In short

This lecture covers key multiple-choice and numerical questions on force, work, pressure, gravitation, and levers for the UP Super TET teaching exam. Concepts explained include work done by vector dot products, pressure formula calculations, variation of gravitational acceleration, mass versus weight, and Archimedes' principle.

Work Done Calculation Using Vectors

Work is defined as the product of force and displacement along the direction of the force.
In vector form, work done is calculated as the dot product of the force vector and the displacement vector: W = F · d.
When multiplying vectors, corresponding directional components are multiplied: i-components with i-components and j-components with j-components.
Given force F = (5i + 3j) N and displacement d = (2i - j) m, the work done is (5 × 2) + (3 × -1) = 10 - 3 = 7 Joules.
Must knowThe SI unit of work is the Joule.

Pressure and Thrust Numerical Problem

Pressure is the normal force (thrust) acting perpendicularly per unit surface area: P = F / A.
Surface area given in square centimetres must be converted to square metres before calculating pressure in standard SI units.
To convert 1 cm² to m², multiply by 10⁻⁴ m²; hence, 10 cm² equals 10 × 10⁻⁴ m².
Must knowFor a normal force of 100 N acting on an area of 10 cm², the pressure produced is 1 × 10⁵ N/m².

Gravitational Force and Acceleration at Earth's Centre

Newton's law of universal gravitation states that gravitational force is inversely proportional to the square of the distance between two masses: F ∝ 1 / r².
If the distance between the Sun and Earth is doubled (2r), the gravitational force decreases to one-fourth (1/4) of its original value.
Weight is the gravitational force acting on a mass and is calculated by W = m × g.
Acceleration due to gravity (g) at the centre of the Earth is 0 m/s².
Must knowBecause g = 0 at the centre of the Earth, the weight of any body placed at the Earth's centre is zero.

Atmospheric Pressure and Absence of Atmosphere on the Moon

Human beings are not crushed by the weight of atmospheric pressure because the internal blood pressure in the human body is slightly higher than atmospheric pressure, neutralizing the external force.
The Moon has no atmosphere because its gravitational acceleration is very low, approximately 1/6th that of Earth.
Due to low gravity on the Moon, the escape velocity is low, and gas molecules cannot be held and escape into space.
Must knowEscape velocity from Earth to break free of its gravitational pull is 11.2 km/s.

Mass vs Weight and Friction Reduction

According to the formula F = G(m1 × m2) / r², if the masses of two interacting bodies are both halved, the resulting gravitational force becomes (1/2) × (1/2) = one-fourth.
Mass is a scalar quantity and a constant property of matter that remains unchanged throughout the universe.
If a person has a mass of 72 kg on Earth, their mass on the Moon remains 72 kg, even though weight decreases.
Applying oil to door hinges reduces friction because oil acts as a lubricant that smooths contact surfaces.
A mass of 27 kg has an equivalent weight of W = mg = 27 × 9.8 = 264.6 N.

Apparent Weight in a Lift and Variation of g

When an elevator accelerates upwards with uniform acceleration 'a', the apparent weight of a person increases: W' = m(g + a).
When an elevator accelerates downwards with uniform acceleration 'a', the apparent weight decreases: W' = m(g - a).
Free play in a vehicle's steering wheel occurs when steering parts become loose, causing wheels not to turn immediately upon turning the steering.
Earth's equatorial radius is maximum, so the value of acceleration due to gravity (g) is minimum at the equator because g ∝ 1 / R².
Must knowThe value of acceleration due to gravity (g) is maximum at the poles because the polar radius is minimum.

Levers, Flotation, and Momentum

In a class 2 lever, the load is situated between the fulcrum and the effort.
A lemon squeezer and a betel-nut cracker (sarota) are standard examples of a class 2 lever.
Archimedes' principle explains why an iron ship floats while a small iron nail or ball sinks: a ship displaces a volume of water whose weight is greater than its own weight.
Must knowAccording to Newton's second law of motion, the rate of change of momentum is directly proportional to the applied force: F = dp / dt.
Vehicle brakes stop wheels from moving due to the frictional force acting between the tyres and the road surface.
The universal law of gravitation applies between any pair of objects possessing mass in the universe.
The value of the universal gravitational constant G is 6.67 × 10⁻¹¹ N·m²/kg².
A weightless rubber balloon filled with 200 g of water has an apparent weight of zero in water due to equal buoyant force.
Ink leaks out from a fountain pen during an aeroplane flight because atmospheric pressure decreases at high altitudes, making the internal pressure of the pen relatively higher.

Key terms

Work: The product of applied force and displacement in the direction of the force (W = F · d).
Pressure: Normal force or thrust applied per unit surface area (P = F / A).
Mass: An invariant scalar quantity representing the amount of matter in a body.
Weight: The gravitational pull experienced by a body, calculated as W = m · g.
Universal Gravitational Constant (G): A universal constant equal to 6.67 × 10⁻¹¹ N·m²/kg².
Free Play: Steering wheel rotation that occurs without turning the vehicle's wheels, caused by loose parts.
Class 2 Lever: A lever system where the load is positioned between the fulcrum and the effort.
Archimedes' Principle: A physical law stating that a body immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces.

Formulas

W = F · d: Work done by a force vector along a displacement vector
P = F / A: Pressure exerted by a normal force over an area
F = G(m1 · m2) / r²: Universal law of gravitation between two masses
W = m · g: Weight of an object under gravitational acceleration
W' = m(g + a): Apparent weight of an object accelerating upwards in a lift
W' = m(g - a): Apparent weight of an object accelerating downwards in a lift
F = dp / dt: Newton's second law of motion as rate of change of momentum

Quick revision

Read these the night before the exam.

Gravitational force becomes one-fourth if the distance between two masses is doubled.
The acceleration due to gravity at the Earth's centre is zero, making weight zero.
Human blood pressure is slightly greater than atmospheric pressure to balance external force.
Earth's escape velocity is approximately 11.2 km/s.
Gravitational acceleration on the Moon is 1/6th of that on Earth.
Mass remains constant everywhere, while weight varies according to the local value of g.
The value of g is minimum at the equator and maximum at the poles.
A lemon squeezer operates as a class 2 lever with the load between fulcrum and effort.
The universal gravitational constant G equals 6.67 × 10⁻¹¹ N·m²/kg².
Ink leaks from fountain pens on aeroplanes due to the drop in external atmospheric pressure at high altitudes.

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