Classical Mechanics
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Bonbo
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PHYSICS
Classical Mechanics
Moment of Inertia
Mass distribution can change how easily objects spin, not just their weight
2 days ago
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How does the distribution of mass relative to the axis affect an object's moment of inertia?
Increasing the distance of mass from the axis increases the moment of inertia, making it harder to change rotational speed.
The moment of inertia depends only on the total mass, not its distribution.
Objects with the same shape always have the same moment of inertia regardless of mass distribution.
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Steeeve
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PHYSICS
Classical Mechanics
Gyroscope
Gyroscopes defy tilting forces by harnessing angular momentum conservation
3 days ago
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What fundamental principle allows a gyroscope to maintain its orientation despite external tilting forces?
Conservation of linear momentum
Magnetic attraction forces
Conservation of angular momentum
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PeterPan
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PHYSICS
Classical Mechanics
Kinetic Energy
The energy of motion can quadruple with just a doubling of speed, reshaping impact outcomes.
5 days ago
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Why does doubling an object's velocity result in quadrupling its kinetic energy?
Because kinetic energy is directly proportional to velocity, so doubling velocity doubles energy.
Because kinetic energy depends only on mass, not velocity.
Because kinetic energy depends on the square of velocity, so it increases by velocity squared.
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Steeeve
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PHYSICS
Classical Mechanics
Newton's Law of Universal Gravitation
Gravity's invisible pull unites falling apples and orbiting planets across the cosmos
6 days ago
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What was the major significance of Newton's law of universal gravitation in understanding gravity?
It unified the understanding of gravity on Earth with the motion of celestial bodies.
It explained gravity only as a force acting near Earth's surface.
It showed that gravity depends only on the distance between objects, not their masses.
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FordMotor
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PHYSICS
Classical Mechanics
Rotational Dynamics
A single fixed axis rotation can never wobble or precess, revealing hidden constraints in motion
10 days ago
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Why does a spinning object speed up when its moment of inertia decreases during rotation around a fixed axis?
Because torque increases automatically when the object changes shape.
Because the fixed axis forces the object to rotate faster regardless of its shape.
Because angular momentum is conserved, so a decrease in moment of inertia increases angular velocity.
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PHYSICS
Classical Mechanics
Gravitational Force
Gravity’s simple formula unites falling apples and orbiting planets in one cosmic dance
10 days ago
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Why does Newton’s law of universal gravitation consider the distance between centers of mass rather than surface distance?
Because surface distance changes depending on the object's shape, making it unreliable
Because gravity only acts at the surface of objects, not through their interiors
Because gravitational force acts as if all mass is concentrated at the center, simplifying calculations
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Johnbarrow
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PHYSICS
Classical Mechanics
Kinetic Energy
Velocity’s square makes kinetic energy explode with speed changes
10 days ago
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Why does doubling an object's speed quadruple its kinetic energy?
Because kinetic energy depends linearly on velocity, so doubling speed doubles energy.
Because kinetic energy depends only on mass, not velocity.
Because kinetic energy depends on the square of velocity, so doubling speed increases energy by four times.
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PHYSICS
Classical Mechanics
Friction
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Friction’s hidden role: the force that both enables and limits motion in everyday life
12 days ago
Contrary to popular belief, friction is not just a pesky force that slows everything down; it is actually essential for almost every movement we take for granted. Without friction, walking, driving, or even holding objects...
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Brewster
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PHYSICS
Classical Mechanics
Change in Velocity (Delta-v)
Space missions hinge on mastering the delicate balance of velocity changes and fuel limits
14 days ago
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Why is delta-v considered a scalar measure of impulse rather than a direct physical change in velocity in spacecraft dynamics?
Because it only measures the speed increase of the spacecraft during launch.
Because it represents the total impulse per unit mass required for maneuvers, not just the vector difference in velocity.
Because delta-v and physical velocity change are exactly the same in all contexts.
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PHYSICS
Classical Mechanics
Mass-Spring System
Spring mass subtly shifts oscillation rhythms in mechanical systems
14 days ago
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Why can't the spring's entire mass be simply added to the suspended mass to determine the oscillation frequency in a mass-spring system?
Because the spring's mass does not contribute to the system's kinetic energy at all.
Because different parts of the spring move at different velocities, so only an effective portion of the spring's mass contributes to the kinetic energy.
Because the spring's mass is always negligible compared to the suspended mass.
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PHYSICS
Classical Mechanics
Initial Velocity
The critical speed that decides if a spacecraft escapes or returns to Earth
10 Feb 2026
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Why is initial velocity crucial in determining whether an object escapes a planet's gravity?
Because it must be at least equal to the escape velocity to overcome gravitational pull without additional forces.
Because any initial velocity will eventually lead to escape if the object moves long enough.
Because initial velocity only affects the direction, not the ability to escape gravity.
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PHYSICS
Classical Mechanics
Gravitational Potential Energy
Lifting an object stores hidden energy that powers motion when released
9 Feb 2026
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How does gravitational potential energy change when two objects are moved further apart in a gravitational field?
It decreases because the objects lose energy as they move apart.
It increases because work is done against the gravitational force to separate them.
It remains the same since gravitational potential energy only depends on mass, not distance.
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JohnyLately
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PHYSICS
Classical Mechanics
Newton's Laws of Motion
Newton's laws explain everything from why you don't float away to how rockets launch into space
8 Feb 2026
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Which law explains why a stationary object remains at rest until a force acts upon it?
Newton's Second Law of Motion
Newton's Third Law of Motion
Newton's First Law of Motion
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PHYSICS
Classical Mechanics
Pendulum
The pendulum’s swing was key to revolutionizing timekeeping with unprecedented accuracy
7 Feb 2026
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What primarily determines the period of a pendulum's swing?
The weight of the pendulum bob
The length of the pendulum
The color of the pendulum bob
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Steeeve
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PHYSICS
Classical Mechanics
Vector Quantity
Vector quantities reveal the hidden directions behind everyday forces and motions
7 Feb 2026
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Why is direction essential in defining a vector quantity in physics?
Because magnitude alone is sufficient to describe all physical quantities
Because vector quantities require both magnitude and direction to fully describe physical phenomena
Because direction can be ignored when measuring physical quantities
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PHYSICS
Classical Mechanics
Velocity Squared
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Kinetic energy depends on velocity squared, making speed increases hugely impactful
5 Feb 2026
Kinetic energy depends on velocity squared, making speed increases hugely impactful Velocity squared might sound like a simple mathematical operation, but it plays a crucial role in understanding motion and energy. When you square velocity,...
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Bonbo
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PHYSICS
Classical Mechanics
Newton's Law of Universal Gravitation
Newton's law unified earthly gravity with celestial motions in a single elegant formula
5 Feb 2026
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What key relationship does Newton's law of universal gravitation describe between two masses?
The gravitational force is proportional to the sum of their masses and directly proportional to the distance between them.
Gravity only acts between objects that are touching each other.
The gravitational force is proportional to the product of their masses and inversely proportional to the square of the distance between them.
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JohnyLately
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PHYSICS
Classical Mechanics
Center of Mass
Center of mass simplifies motion analysis by concentrating mass at a single point
4 Feb 2026
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Why is the center of mass important in analyzing the motion of a rigid body?
Because applying a force at the center of mass causes linear acceleration without angular acceleration.
Because the center of mass is always located at the geometric center of the object.
Because the center of mass determines the color and texture of the object.
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