Newton’s Laws of Motion Looking at the relationship between Force and Motion http://www.brainpop.com/math/geometryandmeasurement/isaacnewton/

Dogs Explain it all http://video.pbs.org/video/1607925512/

Newton’s 1st Law of Motion (Law of Inertia) An object at rest stays at rest and an object in motion stays in motion (at a constant speed and in a straight line) unless acted on by an unbalanced force

Newton’s 1st Law- Objects at Rest An object remains at rest unless an unbalanced force acts on it.

Newton’s 1st Law- Objects in Motion Objects will continue to move with the same velocity unless acted on by an unbalanced force.

When you ride a bus, why do you fall forward when the bus stops moving?

Friction and Newton’s First Law Friction between two objects works against the motion of the of the moving object. Because of friction, observing the effects of Newton’s first law is often difficult. For example, friction will cause a rolling ball to slow down and stop.

Inertia and Newton’s First Law The tendency of an object to resist change in motion. This explains how seat belts work! Can you explain it? http://www.physicsclassroom.com/mmedia/newtlaws/cci.cfm

Mass and Inertia Mass is a measure of inertia Small mass = less inertia Large mass = more inertia Which is easier to throw, a baseball or bowling ball? Why? Which is easier to change the motion of, kicking a rolling soccer ball or kicking a rolling bowling ball? Why?

Newton’s 2nd Law of Motion The acceleration of an object depends on the mass of the object and the amount of force applied (unbalanced force). F=ma or a = F/m

2nd Law Part 1: Acceleration depends of mass The acceleration of an object decreases as its mass increases and that its acceleration increases as its mass decreases. Large Mass = decreasing acceleration Small Mass = increasing acceleration

2nd Law part 2: Acceleration Depends on Mass An object’s acceleration increases as the force on the object increases. An object’s acceleration decreases as the force on the object decreases. Increasing Force = Increasing Acceleration Decreasing Force= Decreasing Acceleration The acceleration of an object is always in the same direction as the force applied.

Expressing Newton’s Second Law Mathematically F=ma or a = F/m http://www.youtube.com/watch?v=5C5_dOEyAfk

Math Focus

Newton’s 3rd Law All forces act in pairs Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object. All forces act in pairs

Action reaction Forces Force Pairs do no act on the same object. When a force is exerted, there is always a reaction force. A force never acts by itself.

http://www.youtube.com/watch?NR=1&v=NRKmJgIokxg&feature=endscreen

https://www.brainpop.com/science/motionsforcesandtime/newtonslawsofmotion/