HW: No Homework Tonight Bring in Paper Towel Rolls Bring in cans of Tuna for the Turkey baskets Notes Topic # 8 – THIS Will GO IN YOUR NOTES SECTION Bellringer: Finish Gravity reading. HW: Quiz tomorrow on Notes topic 5, 6 & 7

Newton’s Laws of Motion Sir Isaac Newton

Newton’s First Law The Law of Inertia

Newton’s 1st Law: Inertia an object at rest will remain at rest unless acted on by an unbalanced force. an object in motion will remain in motion unless acted on by an unbalanced force.

Examples- Wearing a Seatbelt: object in motion When a car comes to a sudden stop, a passenger without a seatbelt will keep moving until acted on by a force- the windshield.

Let’s take a look!

2. Ball on a field: object at rest A soccer ball at rest does not move unless acted on by a force- someone kicking it.

Inertia: the tendency of objects to resist change in their velocity The greater the mass of an object, the more inertia it has.

Which vehicle has more inertia? Why? Tractor trailer It has more mass so it takes more force to change its motion.

Let’s look at an egg demonstration…

Do the shopping carts have inertia?

Table Cloth Demonstration Let Mr. S serve you!!!!

Cat Escape Video- An object in motion stays in motion!

Penny Activities… When you complete the penny activities you should work on #22- Newton’s First and Second Laws

The Law of Acceleration Newton’s Second Law The Law of Acceleration

Newton’s 2nd Law of Motion The acceleration of an object is affected by the mass of the object and the force applied to the object.

A larger force results in greater acceleration.

In other words, an object with more mass will need more force to accelerate.

Which object would be harder to move, a bowling ball or golf ball Which object would be harder to move, a bowling ball or golf ball? Explain your answer. A bowling ball has more mass so it has more inertia. The bowling ball will require more force to have the same acceleration as the golf ball.

Force= mass x acceleration F- force m- mass a- acceleration

Example- If an object has a mass of 42 Kg and accelerates at a rate of 5 m/s2, how much force is applied? F = m · a F= 42Kg x 5 m/s2 F= 210.0 Kg∙m/s2 F= 210.0 N

If they push with the same force (10N), who will have a greater acceleration? Person B Mass= 65Kg Person A Mass= 80Kg a = F ÷ m a= 10N ÷ 80Kg a= 0.1 m/s2 a = F ÷ m a= 10N ÷ 65Kg a= 0.2 m/s2 a = F ÷ m

Let’s look at the effects of force and mass on acceleration!

a = F ÷ m (Acceleration- m/s2) m = F ÷ a (Mass- Kg) F = m x a (Force- N) a = F ÷ m (Acceleration- m/s2) m = F ÷ a (Mass- Kg) Round to nearest tenth

Newton’s Third Law Action & Reaction

Newton’s 3rd Law: Action- Reaction For every action there is an equal and opposite reaction. In other words, forces come in pairs.

How does a rocket take off?

Space Shuttle Launch 300N Action 300N Reaction Action: rockets firing and pushing downward on the ground Reaction: shuttle moving upward and lifting off of the ground Space Shuttle Launch 300N Action 300N Reaction

Space Shuttle Launch

Action Reaction (basketball player) Label the action force and reaction force. Fill in the missing force. 500 N ________________

Let’s do an example… And I Push If I push Reaction PUSH PUSH Action

Another Example:

Newton’s Cradle

Action

Reaction

Newton’s Cradle

any force that causes an object to move in a circular path Centripetal force: any force that causes an object to move in a circular path means “center-seeking”

Examples: roller coaster

satellite orbiting Earth

The Great School Escape Gym Math Class 12a-2= The Front Desk (Start Here) Deans Office School Bus French Class POOLL Cafeteria Science Class

The Great School Escape Gym Math Class 12a-2= The Front Desk (Start Here) Deans Office School Bus French Class POOLL Cafeteria Science Class

The Great School Escape Gym Math Class 12a-2= The Front Desk (Start Here) Deans Office School Bus French Class POOLL Cafeteria Science Class

The Great School Escape Gym Math Class 12a-2= The Front Desk (Start Here) Deans Office School Bus French Class POOLL Cafeteria Science Class

1- Front Office 7 – Deans Office 3 – Gym 7 – Math Class 5 – Pool 9 – French Class 3- Bus 1 - Cafeteria 7,