1. Newton ’ s Laws of Motion… In other words… why do things move and accelerate? Arsenie, 2014

2. Some vocab to remember… Vocabulary WordDefinition Vector Free Body Diagram

3. REMINDER…

4. SO…. What is the force that allows you to start moving a skateboard? What is the force acting upon you as you move down a skateboard ramp? As you move down a skateboard ramp, will you be getting faster or slower?

5. TermDefinition Force Acceleration Velocity Net force (ΣF ) Inertia

6. TermDefinition Newton (N) System Equilibrium

8. WHY BRAIN INJURIES…

9. Crash Test Dummies 1- Straight Line

10. Newton ’ s 1st Law: The Law of Inertia Newton’s first law states that… Simply put, things tend to… Objects in a state of rest tend to … Objects in motion tend to… Only _____________will change that state.

11. Mass—A Measure of _________ The more mass an object has… THE OPPOSITE ALSO APPLIES. Mass is… Mass is measured in the fundamental unit of -___________(or grams)

12. INERTIA – More mass   MORE FORCE NEEDED TO MOVE – Less mass  less resistance  NEEDED TO MOVE

13. Mass Is ________ The amount of material in a particular object is… The same amount of Force needed to change the state of motion of the object…

14. It ’ s just as difficult to shake a stone in its weightless state in space as it is in its weighted state on Earth.

15. We can define mass and weight as follows: – Mass is the -Weight is… An object would have zero weight if it were in an environment that has no gravity, i.e., outer space. If in the same location, however, the mass and weight would be proportional. So if I double the mass of something, I would also double the weight.

16. Force Causes Unbalanced forces acting on an object cause... Motion at a constant speed… Force is required only to…

17. Acceleration net force An object ’ s acceleration is ____________proportional to the net force acting on it. (The symbol stands for “ is directly proportional to. ” )

18. Mass _____________Acceleration For a constant force, an increase in the mass will result in a decrease in the acceleration. The acceleration is ______________________to the mass.

19. Newton ’ s 2 nd Law: F=ma describes the relationship among an object's mass, an object's acceleration, and the net force on an object.

20. REVIEW: UNITS  1 Newton (N) is the force it takes to accelerate a mass of 1kg at an acceleration of 1 m/s 2.

21. Do the math! A car has a mass of 1000 kg. What is the acceleration produced by a force of 2000 N?

22. DO THE MATH 2

23. Friction Friction is … It always acts in the … When friction is present, an object may move with a constant velocity even when an outside force is applied to it. In such a case, the friction force just balances the applied force. The net force is _______, so there is no acceleration.

24. Free – Body Diagrams A diagram …

25. Newton’s Third Law Review: FORCE E&O FORCE Newton ’ s third law states that whenever one object exerts a force on another object, the other object exerts an equal and opposite force on the first object.

26. When you push on the wall, the wall pushes on you. When you run, you’re actually pushing the earth back with your feet and the earth pushed you forward.

27. Newton ’ s third law … One force is called the ______________. The other force is called the _________________________. (it doesn ’ t matter which is which) Neither force exists without the other. They are __________in strength and _____________in direction. They occur at the same time (simultaneously).

28. So then, how do things ever move? Forces do cancel each other. Particularly when there is no movement, or at constant velocity. However… A force ______________to the object is needed for acceleration. The football is kicked. The foot acts on the ball and the ball accelerates.