Force and motion
Newtons laws and simple machines
simple machines a newtons laws are connected
Could you imagine life without simple machines? They help us with work we do in every day life. A wheel and axle is apart of a car. If you step on the brakes to fast you might experience Newton's first law of motion. The law states that, an object in motoin stays in motion and an object at rest stays at rest unless acted on by an outside force. When you step on the brake too fast the car will stop but your body will keep going.
Three kinds of Simple machines
Simple machines help us do work we do in every day life. Simple machines don't reduce the amount of work we do, they just make the work easier. Simple machines are every where. One kind of simple machine is the pulley. A pulley is a flag on a flag pole. If you pull on one end of the rope the other end will make the flag go up or down. Another kind of simple machine is an inclined plane. If a person in a wheel chair wants to go up or down stairs they use an inclined plane or, a ramp. Another simple machine is the screw. When you want to go up or down you use the stairs. Strains are an example of a screw. You can find these stairs in a light house.
Three kinds of simple machines
One kind of simple machine is a lever. You ,may not know it but the lever is at the park. The lever at the park is the seesaw. The seesaw has a fulcrum. The fulcrum is the thing in the middle of the seesaw. Another simple machine is a wheel and axle. The wheel and axle is a handle on the sink. When you turn the handle a pole on the other end moves in a circular motion. A wedge is a simple machine. The wedge can be a pair of scissors. Scissors cut things when you squeez them shut. They are also shaped like a wedge.
Newtons first law
Newton's first law is the law of inertia. The law says that an object in motoin stays in motion and an abject at rest will stay at rest unles acted on by an outside force. An example is a book sitting on a table. If you push it off it will go in a straight line until a force, in this case gravity, pulls it down toward the ground. The object will remain in rest after that, unless it is acted on by an outside force, like your mom picking it up.
Newton's second law
Newton's second law states that force equals mass times acceleration, the greater the force the greater the speed. If you had two books and you push one with less force than the other the book you pushed with more force will go farther. The book will eventually stop.
Newton's third law
The third law is also known as the action-reaction law.Newtons third law states that for every action there is an equal and opposite reaction. If you are pushing on someone's hands and they are pushing on yours, and you are both pushing with five newtons both of you will stay there. If one of you starts pushing with six newtons and the other is pushing with five newtons you will move toward the person pushing with five Newton's.