## 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 tripled. If the force … more

## Parabolic motion (Monkey and Hunter)

Projectile Motion When you throw an object, the object falls with a certain curve. The object performs a parabolic motion. This is a motion on a two-dimensional plane, not a straight line. To understand this movement, it is necessary to … more

## Conical pendulum

3 forces acting on a conical pendulum Gravity(=mg): The force the Earth pulls. Tension: The force applied to both ends of the thread. Tension is always directed to the center from both ends. Centripetal force(Fc): The force that maintains circular … more

## Condition of Uniform Circular Motion

Even if the force works, the speed does not change? When an object moves linearly at a constant velocity, the force applied to the object is zero because there is no change in velocity. If so, is there a motion … more

## Theo Jansen Mechanism

Theo Jansen He is the leading artist of kinetic art with the nickname of Da Vinci in the 21st century. He is famous for making wind-driven structures using simple materials such as PET bottles, tubes, and cable ties. Since 1990, … more

## Projectile Motion

Projectile Motion When you throw an object, the object falls with a certain curve. The object performs a parabolic motion. This is a motion on a two-dimensional plane, not a straight line. To understand this movement, it is necessary to … more

## Uniformly Accelerated Motion

Motion of changing speed When a force of a certain size and direction acts on an object, the object moves at a constant rate of speed. These movements are easy to find around us. For example, the speed of a … more

## Inertia Force of Elevator

Elevator and inertia Elevators are an excellent place to feel the inertia force. Consider the case of taking an elevator and trying to go up from the lower floor. When you press the button that goes up, you suddenly feel … more

## Clay Shooting

Parabolic motion Let’s think about the motion of throwing an object horizontally. There is no horizontal force when there is no air resistance, so there is no change in speed. This time, let’s consider a dropping. If the initial velocity … more

## Principle of Satellite

How cannonball become an artificial satellite? a. Imagine that a cannonball falls in a parabolic curve. The trajectory the cannonball draws is actually part of an elliptical orbit centered around the Earth. The center of the Earth corresponds to the … more

## Constant Velocity

Constant motion Constant velocity motion refers to motion with constant velocity. When a force is applied to an object, the object’s velocity changes, so the sum of all the forces applied to the object in uniform motion becomes ‘0’. For … more

## Motion Analysis (with Webcam)

How to use Click on the object (usually a ball) to track on the screen. The position of the object is tracked and displayed on the screen at regular intervals. You can adjust the number of points displayed on the … more