TOC: Newton’s Laws of Motion 12/1/2015

Set up your foldable like this!!!!

Newton’s First Law of Motion What does this really mean? – An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force. Inertia – Tendency of an object to resist a change in motion – Inertia means that the object’s motion will stay constant in terms of speed and direction – Depends on the mass of an object – Does NOT depend of the presence of gravity An object’s inertia is the same on Earth and in space – Objects with a greater mass have greater inertia

Examples of the Law of Inertia If an object is in motion, it will keep going until something stops it. How would vehicle restraints help in this situation? ofmotion.jsp

Newton’s 1 st law demo nue=100&v=0oyJmFe3ffg&noredirect=1 nue=100&v=0oyJmFe3ffg&noredirect=1 nqoQ nqoQ

Check for Understanding Which object has the greater inertia? Restate Newton’s First Law of Motion in your own words. What is inertia? What are some examples of Newton’s First Law of Motion?

TOC: Newton’s Laws of Motion 12/2/2015

Newton’s first law REVIEW Summarize what the law states. What does an object at rest need for it to move? What is another name for Newton’s first law of motion? What is inertia? What causes a moving object to stop moving? The (more/less) mass an object has, the harder it is to move.

An object with a smaller mass has LESS INERTIA Easier to accelerate a small mass More difficult to accelerate a large mass that has more inertia F = force (N) m = mass (kg) a = acceleration (m/s 2 ) Newton’s 2 nd Law The acceleration of an object depends on the mass of the object and the amount of force applied

Part 1: Acceleration depends on mass Acceleration of an object decreases as its mass increases Acceleration of an object increases as its mass decreases Which would be easier to push? WHY?

Newton’s law with MATH Formula: F= M x A Force acceleration mass UNITS  acceleration: m/s² (meters per second squared) force: N (Newtons) mass: kg ( kilograms)

More examples of the Law of Force and Acceleration Roller Coaster nt%20research/projects/Rollercoas ter%20Simulation/index.html Baseball: home run vs. bunt Football ootball/newtonsecondlaw.jsp

Check for Understanding Restate Newton’s Second Law in your own words. Which would require a greater force to accelerate? WHY? – A hockey puck on ice or a hockey puck on uncut grass? – An empty suitcase or a suitcase full of bricks? If the mass of a rock is doubled, what happens to its acceleration if the force does NOT change?