Movement on the Pulley

Movement of an object suspended from a pulley

Movement on the pulley Two objects are connected by a string on a fixed, frictionless pulley and are moving together. In this case, the mass of the string and pulley is ignored. Since tension \(T\) and … more

Archimedes Buoyancy

Archimedes Buoyancy 1

Why is the submerged volume important to understand buoyancy? It is so famous that the 3rd-century Greek philosopher Archimedes shouted “Eureka!” and ran out of the bathhouse naked. (What did Archimedes find out? – Quotations from … more

Three Body Problem

Three Body Problem

x y Vx Vy * The mass and gravitational constant of the celestial body were each assumed to be ‘1’. * You can edit the position and speed of each celestial body while not running. * … more

Free Fall Motion Analysis

Free Fall Motion Analysis

Why do light and heavy objects fall at the same time? The change in speed due to gravity is the same for all objects because the force and inertia acting on an object are proportional to … more

태양계

Solar System

Solar System All the orb bodies that revolve around the sun and their space are called the solar system. The celestial bodies that make up the solar system include the eight planets revolving around the sun … more

Kinetic energy

Kinetic Energy

Kinetic energy All moving objects have kinetic energy. The kinetic energy Ek of an object with a mass of ‘m’ and a velocity of ‘v’ can be calculated as follows. \[E_{ k }=\frac { 1 }{ … more

Elastic Energy

Elastic energy

Elastic (potential) energy stored in the spring The elastic energy is stored in the deformed spring. Also called ‘potential energy,’ and denoted by Ep. \[ Elastic \;energy \;E_p(J) = \frac{1}{2}kx^2 \] m: Mass (kg) k: Spring … more

Earth's gravity

Earth’s gravity

Gravity Gravity is the force that is attracted between all objects with mass. According to Newton, an object with mass attracts each other with force proportional to the two objects’ mass and inversely proportional to the … more

Range and Intensity of the Gravity

Range and Intensity of the Gravity

Gravity Gravity is the force that is attracted between all objects with mass. According to Newton, an object with mass attracts each other with force proportional to the two objects’ mass and inversely proportional to the … more

중력 렌즈

Gravitational Lensing

Space-time warpage Einstein, famous for the theory of relativity, thought that the mass of an object warps space-time. The larger the mass, the greater the degree of time-space warp. He explained that an object’s falling or … more

force and the change of the movement

F = ma (Newton’s law of motion)

Force changes the motion Consider the process of changing the movement by applying force to the cart. If the amount of force acting on the cart is doubled or tripled, the speed change is doubled or … more

Spring Scales

Spring Scales

A spring scale is a tool that measures the mass and gravity of an object using the spring’s elastic force. The spring of this scale is lengthened by gravity and shortened by elasticity. You can find … more