Force & Motion
Newtons laws and Simple Machines
Simple machines are tools to help you do work easier. The six simple machines are screw, inclined plane, pulley, wheel and axle, lever, and wedge. Sir Isaac Newton is the creator of the laws of motion. The laws explain how force and motion work. Do you know what the laws are?
Newtons laws explain how motion works. There are three laws. 1st law (law of inertia), 2nd law, and the third law (the action reaction law). The first law is law of inertia. It means objects at rest stay at rest and objects at motion stay at motion unless acted upon an outside force. That explains how nothing can move unless someone or something puts force on it. Then, there is the second law. This means f=ma. That explains how you need mass and acceleration to use force. Finally, there's the third law. This means that for every action there is a reaction. This explains how example- If a worm jumps off the apple the worm is going to go in one direction and the Apple is going the opposite direction.
An object in motion stays in motion and a object at rest stays at rest unless acted upon an outside force
You need f= ma
For every action there is a reaction
Simple machines help people do work easier. There are six simple machines. Inclined plane, wedge, screw, lever, wheel and axle, and pulley. The first one is a inclined plane. The inclined plane is a flat surface with one end higher than the other. Next, is the wedge. A wedge is an object that is thick at one edge, tapered to a thin edge at the other. Then, there is a screw. A screw is an inclined plane that is wrapped around a cylinder. After that,there is lever. A lever is a straight bar that pivots on or around a fulcrum. Then, there is a wheel and axle. A wheel and axle is a wheel attached to a bar so that they rotate together. Finally, there is a pulley. A pulley is a chain, belt, or wrapped around a wheel. All of these machines help to do work easier.