Newtonian Mechanics and Forces

Hydraulic brakes work on Pascal's law, which states that pressure applied to an enclosed fluid is transmitted undiminished to all parts of the fluid. A small force on the brake pedal creates large force at the wheels through pressure transmission.

Viscosity is the internal friction in fluids that resists flow. It arises due to intermolecular forces between layers of fluid moving at different velocities. Just as solid friction opposes relative motion between surfaces, viscosity opposes relative motion between fluid layers.

 Work is a scalar quantity.

Work is defined as force multiplied by displacement in the direction of the force (W = F × d × cosθ). When pushing against a wall that doesn't move, the displacement is zero, so no work is done regardless of how hard you push. Option A is incorrect because no displacement means no work. Option C is wrong because the wall doesn't move. Option D is incorrect since B is the right answer.

In a vacuum, all objects fall with the exact same acceleration due to gravity, regardless of their mass or composition, as established by Galileo. Speed and velocity change continuously during free fall, so they are not constant. Force depends on mass, so different objects experience different gravitational forces.

During free fall, the only force acting on a body is gravity (mg). Since there's no support force (normal reaction), the body experiences apparent weightlessness - what we commonly call 'weightless'. This is standard physics terminology despite the body still having mass. Options B, C, and D are incorrect because free fall isn't about having minimum, maximum, or medium weight.

From Newton's second law: F = ma, rearranged gives m = F/a. Mass equals applied force divided by resulting acceleration. Option D (F/Δp) is incorrect because Δp = F·Δt, so F/Δp = 1/Δt, not mass. Options A and B incorrectly use velocity instead of acceleration.

Newton's second law (F = ma) explains this - the loaded truck has more mass (m), so at the same velocity, it has more momentum. Stopping it requires more force to produce the deceleration. Newton's first law describes inertia, third law describes action-reaction pairs, and gravitational law governs attraction between masses.

When a body moves uniformly in a straight line, its velocity is constant (both speed and direction unchanged). By Newton's first law, this means zero net force acts on it. Zero force is neither maximum, minimum, nor average - it's simply zero. Any acceleration would require a net force, causing non-uniform motion.

Among the four fundamental forces of nature, gravitational force is the weakest by far - approximately 10^36 times weaker than the strong nuclear force and 10^25 times weaker than electromagnetic force. Nuclear force is strongest, followed by electromagnetic, then weak nuclear, with gravity being weakest.

No, it is not a periodic motion. Hence, it is the correct answer.

Yes, it is correct. It is inertia because of which an object in rest has tendency to remain in rest. The pile of coin already in rest, continues to remain in rest.

Yes, it is correct. Thrust acting upon a unit area is called pressure. Its S.I. unit is Pascal denoted by ‘P’

Yes, it is the correct answer, as this statement is incorrect. Earth attracts everything towards it by an unseen force of attraction.