![]() Physics. 4Kids. com: Motion: Introduction. Mechanics and Motion. Motion is one of the key topics in physics. Everything in the universe moves. It might only be a small amount of movement and very very slow, but movement does happen. Don't forget that even if you appear to be standing still, the Earth is moving around the Sun, and the Sun is moving around our galaxy. The movement never stops. Motion is one part of what physicists call mechanics. Over the years, scientists have discovered several rules or laws that explain motion and the causes of changes in motion. There are also special laws when you reach the speed of light or when physicists look at very small things like atoms. Forces need to act upon an object to get it moving, or to change its motion. Changes in motion won't just happen on their own. So how is all of this motion measured? Physicists use some basic terms when they look at motion. How fast an object moves, its speed or Velocity, can be influenced by forces. Acceleration is a measure of how much the velocity of an object changes in a certain time (usually in one second). Velocities could either increase or decrease over time. Mass is another big idea in motion. Mass is the amount of something there is, and is measured in grams (or kilograms). A car has a greater mass than a baseball. The first idea is that there are simple movements, such as if you're moving in a straight line, or if two objects are moving towards each other in a straight line. The simplest movement would be objects moving at constant velocity. For such complex motions to occur, forces must also be acting, but at angles to the movement. Screw (for Kids) - Simple Machine - Physics for Kids. A screw is one of the most commonly used mechanical devices in the world. It is a machine that converts rotational motion into linear motion. Why is a Screw a Simple Machine? A screw has a long and thin metal shaft with threads spiralling along it’s length. It also has a turning head with a groove where a screwdriver can be used to rotate the screw. The strength of a screw’s hold depends on the width of the threads and the distance between them. The closer and wider the threads, the stronger the hold will be. However, more threads require more rotations to attach the screw and wider threads require more force in the rotations. The mechanical advantage of the screw increases when the angle of the spiral increases. The screw has become an integral part of the mechanical age. It can be used to: nut and bolt – Hold things together. Physics4Kids.com! This tutorial introduces the physics of motion. Other sections include modern physics, heat, electricity, magnetism, and light. Car jack – Lift heavy loads. Drill gun – Drill holes on objects. Fansler – Beddingfield High School - Page 3 Physics Lesson #9 – Energy, Work and Simple Machines what about when the force is not constant? Easy and fun science experiments and activities for kids plus cool STEM challenges to encourage curiosity in the world of STEM.Explore science and STEM. Chem4Kids.com! The site that teaches the basics of chemistry to everyone! Tutorials on matter, atoms, elements, the periodic table, reactions, and biochemistry. Discover the amazing world of physics for kids with our awesome range of free games, fun experiments, science fair projects, interesting facts, amazing videos. For more such interesting Physics videos and articles visit our Physics for Kids category.
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