DensityMomentsPressure SAQ

The moment of a force is the turning effect of a force, and it is calculated by multiplying the force by the perpendicular distance to the fulcrum, or M = F ×⊥ d.

A fulcrum is a fixed point about which a rigid body (called a level) is free to rotate.

The formula is M = F ×⊥ d, where M is the moment of the force, F is the force, and d is the distance from the force to the fulcrum.

<p>The unit of measurement for the moment of a force is Nm (Newton-meters).</p> Signup and view all the answers

<p>A rigid body that is free to rotate about a fixed axis</p> Signup and view all the answers

<p>Two parallel forces with the same magnitude acting in opposite directions</p> Signup and view all the answers

<p>The torque of a couple is directly proportional to the distance between the forces</p> Signup and view all the answers

<p>The torque of the couple increases</p> Signup and view all the answers

<p>Because the distance between the forces represents the moment arm of the force, and multiplying it by the magnitude of the force gives the torque</p> Signup and view all the answers

<p>When a body is at rest.</p> Signup and view all the answers

<p>Forces up equal forces down, and forces left equal forces right.</p> Signup and view all the answers

<p>Travelling at constant velocity and its rate of rotation is neither increasing nor decreasing.</p> Signup and view all the answers

<p>The sum of the clockwise moments is equal to the sum of the anti-clockwise moments.</p> Signup and view all the answers

<p>Density = m/V</p> Signup and view all the answers

<p>Pascal (Pa)</p> Signup and view all the answers

<p>P = F/A</p> Signup and view all the answers

<p>p = ρgh</p> Signup and view all the answers

<p>Density, acceleration due to gravity, and depth</p> Signup and view all the answers

<p>The primary cause of the Bends is the rapid change in pressure from high to low, resulting in the formation of nitrogen gas bubbles in the bloodstream. This occurs when a diver returns to the surface too quickly after being at a high pressure deep below the surface.</p> Signup and view all the answers

<p>The force is buoyancy, and its direction is upward.</p> Signup and view all the answers

<p>Pressure increases with depth, and this is due to the weight of the fluid above, which is transmitted to the fluid below, causing the pressure to increase.</p> Signup and view all the answers

<p>The fundamental property is that pressure acts perpendicularly to any surface, and it is this property that explains the behavior of pressure in a fluid.</p> Signup and view all the answers

<p>Archimedes' Principle, which states that the weight of a floating body is equal to the weight of the fluid it displaces.</p> Signup and view all the answers

<p>The denser the fluid, the less the hydrometer will sink.</p> Signup and view all the answers

<p>The pressure is inversely proportional to the volume, or p ∝ 1/V.</p> Signup and view all the answers

<p>A hydrometer is used to measure the density of a liquid, and it works by sinking into the liquid to a certain depth, which is indicated by a scale on its side.</p> Signup and view all the answers

<p>The upthrust on a body immersed in a fluid is equal to the weight of the fluid displaced.</p> Signup and view all the answers

<p>Newton's Law of Universal Gravitation states that any two point masses in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The factors that affect the gravitational force are the masses of the two objects and the distance between them.</p> Signup and view all the answers

<p>Acceleration due to gravity is the force that causes an object to accelerate towards the ground when it is in freefall. It is a manifestation of the force of gravity, and it is equal to the force of gravity acting on an object.</p> Signup and view all the answers

<p>The force of gravity is responsible for keeping the Moon in orbit around the Earth and the Earth in orbit around the Sun. It is the force that holds the two objects together and keeps them moving in their respective orbits.</p> Signup and view all the answers

<p>g = GM / R^2</p> Signup and view all the answers

<p>Terminal velocity is the maximum velocity an object can reach as it falls through a fluid, such as air or water. It is the point at which the force of gravity acting on the object is equal to the force of air resistance, causing the object to stop accelerating.</p> Signup and view all the answers