1. Newton’s 2 nd Law of Motion Ch 3 Sect 1

2. Review Speed Definition Velocity Definition Acceleration Definition Mass Definition Force Definition

3. Force, Mass and Acceleration Force, mass, and acc are related because they all affect each other Force, mass, and acc are related because they all affect each other Acceleration of an object depends on its mass and the force that is being applied to it Acceleration of an object depends on its mass and the force that is being applied to it

4. Force, Mass and Acc (Cont) The more mass an object has the more force required to move it The more mass an object has the more force required to move it 8 Newtons 5 Kg 16 Newtons 10 kilograms

5. Force, Mass and Acc (Cont) If an object has more force applied to it then it will accelerate quicker If an object has more force applied to it then it will accelerate quicker 1,000 grams 20 Newtons 1,000 grams 10 Newtons

6. Force, Mass and Acceleration (cont) Acceleration = Net Force (N) Acceleration = Net Force (N) Mass (Kg) Mass (Kg) A net force of 400 newtons was applied to an object that has a mass of 2000 kilograms, what was its acceleration?

7. Newton’s 2 nd Law of Motion A net force acting on an object will cause the object to accelerate in the direction of the net force A net force acting on an object will cause the object to accelerate in the direction of the net force If you push something with enough force to move it, then it is going to move in the direction you are pushing it! If you push something with enough force to move it, then it is going to move in the direction you are pushing it!

8. Friction Friction is the force that opposes motion between two objects –When objects are touching they naturally cause a resistance in motion –Friction occurs because microwelds form between microscopic bumps –Microbumps Microbumps

9. Types of Friction There are 3 types of friction that you will need to know for the test 1.Static friction-friction that occurs between things that are not moving 2.Sliding friction-friction that occurs when one object is sliding over another object 3.Rolling friction-friction that occurs when one object is rolling over another object

10. Air Resistance Air resistance-the force that opposes motion when objects are moving through air –Air resistance can happen when something is falling or moving –forces forces

11. Air Resistance Air resistance is determined by the speed size and shape of an object In a vacuum (which has no air in it) all objects will fall at the same rate of speed

12. Terminal Velocity Terminal velocity happens when gravitational force and air resistance reach there maximum ability on something that is falling –Gravity is pulling it down as fast as it can –There is the most air resistance possible going against it –The object is falling as fast as it can possibly fall