Newton’s Laws of Motion

Sir Isaac Newton Described 3 laws that relate forces to motion Force-a push or a pull, all forces have size and direction. A force can cause the motion of an object to change.

Friction, Inertia and Mass Friction- a force that opposes motion between 2 objects that are touching. Inertia-tendency of all objects to stay at rest or in motion Mass- the amount of matter in an object.

Newtown’s 1st Law of Motion An object at rest remains at rest and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force. Known as the “Law of Inertia” Car suddenly stops and you strain against the seat belt Car turns left and you appear to slide to the right

What is Motion? Motion is when an object changes place or position. To properly describe motion, you need to use the following: Start and end position? Movement relative to what? How far did it go? In what direction did it go?

What is Speed? Speed is the distance an object travels in a certain amount of time. To calculate speed, you use the following formula: Speed (s) = Distance (d) Time (t)

Newton’s 2nd Law of Motion The acceleration of an object depends on the mass of the object and the amount of the force applied. Acceleration - the rate at which velocity changes An object accelerates if its speed changes An object accelerates if its direction changes An object accelerates if both speed and direction changes. Force = mass x acceleration F=m x a

Newton’s 3rd Law of Motion For every force, there is an equal and opposite force Always a action and reaction 2 cars hit head on Jumping out of a boat onto a dock Astronauts in space

Review of Newton’s Laws of Motion What is Newton’s 1st Law of Motion? How do we calculate speed? What is inertia?

Review of Newton’s Laws of Motion What is Newton’s 2nd Law of Motion? What is an example of Newton’s 2nd Law? What is the formula used for Newton’s 2nd Law?

Review of Newton’s Laws of Motion What is Newton’s 3rd Law of Motion? What is an example of Newton’s 3rd Law of Motion not found in the lecture?