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
Force Simulation
Force on Inclined Plane
Gravity acts on all objects. Suppose an object is placed on an inclined plane. This object is subjected to a force that slips downward by gravity. If the slope is θ, then the magnitude of this … more
Little Prince’s Trampoline
Law of action and reaction When we apply a force to an object, that object exerts an equal force back on us. The force we apply is called the “action,” while the force exerted on us … more
Addition of Force
Three elements of force When a force acts on an object, the object’s motion varies depending on the Three elements of force. That is the magnitude, direction, and point of action. Therefore, when displaying a force, … more
Buoyancy: Archimedes and the Crown
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
Gravity difference on several planet (with the scale that used on Earth)
Let’s measure my weight on several planets with the scale that we used on Earth. Newton explaining the gravity mathematically Every object has a gravitational field around it and attracts surrounding objects. The strength of this … more
A Spaceship without Deceleration Engine
The inertia of the rocket Since there is no friction in outer space, stopping a rocket’s engine in motion does not stop it immediately. When the rocket’s engine is stopped, the rocket continues to move forward … more
Addition of Force 2
Three elements of force When a force acts on an object, the object’s motion varies depending on the Three elements of force. That is the magnitude, direction, and point of action. Therefore, when displaying a force, … more