Force & Motion

Explaining Newton's Laws and Simple Machines

Simple Machines and Newton's Laws

There are 3 laws of motion. Sir Isaac Newton made these after watching apples fall from trees. There is a story that he made these laws after an apple fell on his head, but it is not true. Now let's move on to the 6 simple machines. We use them all the time, like when we play on the seesaw at recess we are using a simple machine. When we are cutting vegetables, we are using a simple machine. Without simple machines, we would have to do a lot more work. So let's go check out some of the laws and simple machines!
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Sir Isaac Newton

Sir Isaac Newton was an English physicist and mathematician who is widely recognised as one of the most influential scientists of all time and as a key figure in the scientific revolution.

Newton's Laws of Motion

  • Newton's 1st Law of Motion states: An object at rest will remain at rest unless acted on by an outside force. An object in motion continues in motion with the same speed and in the same direction unless acted on by an outside force. This law is some times referred to as "The Law of Inertia".
  • Newton's 2nd Law of Motion states: Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the mass). This law is also called F=MA.
  • Newton's 3rd Law of Motion states: For every action there is an equal an opposite reaction. This law is often referred to as the Action/Reaction Law.

Simple Machines

There are 6 simple machines. There is an inclined plane, wedge, screw, lever, wheel and axle, and a pulley. We use simple machines all the time. Did you know a ramp is a simple machine? Well it actually is. Simple machines are everywhere, let's go check some out!

Compound Machines

A compound machine is a machine that consists of 2 or more simple machines. An example of a compound machine is a wheel barrow. A wheel barrow consists of a lever and a wheel and axle.
A bicycle is an example of a compound machine. A bicycle consists of wheel and axle, lever, pulley, screws, and inclined plane. As you see in the picture.

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Mallory-Simple Machines