1. Motion

2. Event that involves a change in the position or location of something.
Definition
Event that involves a change in the position or location of something.

3. Motion is Relative
Relative – it is described compared to a REFERENCE POINT

4. Scalar Quantities Show magnitude [amount] only
Speed, time, temperature

5. Vector Quantities Show magnitude and direction
Velocity, acceleration, force
May be graphically represented
Arrows

6. Speed Average Speed Comparison of time and distance
A scalar quantity [magnitude only]
Distance traveled per unit time
S = d / t
T = d / s
D = s x t

7. Speed Instantaneous Speed
Speed at any instant

8. Speed Constant Speed Speed that does not change
Instantaneous speed that does not change

9. Velocity
Speed AND direction
A vector quantity [magnitude & direction]

10. Acceleration A change in velocity Speeding up Slowing down
Positive acceleration
Slowing down
Negative acceleration
Deceleration
Changing direction

11. Forces – Chapter 12 Pushes or pulls
May cause acceleration [changes in motion]
Measured in Newton (N)
F=ma

12. Balanced Forces All forces acting on an object are equal
There is no motion

13. Unbalanced Forces All forces acting on an object are not equal
One or more force is stronger than others
Motion occurs

14. Balanced or Unbalanced Forces?

15. Net Force The sum of all forces acting on an object A net force of 0
No motion
A net force of more than 0
Motion occurs

16. Friction Force that slows down motion
Air resistance creates friction in most situations

17. Air Resistance
Opposes the motion of objects that move through the air.
Force of air resistance
Force of air gravity

18. Gravity Force that attracts all objects toward each other
More mass = more gravity
Acceleration due to gravity is 9.8 m/s/s
All objects accelerate at the same rate
gravity video
elevator video

19. Gravity What is Gravity?
It is an attractive force between two objects that depends on the masses of the objects and the distance between them.
Force of Earth’s Gravity
F = m*g
Force of gravity(N) = mass(kg) * acceleration of gravity(m/s2)

20. Newton's Laws
Describe motion and changes in motion

21. First Law of Motion Law of inertia
Objects at rest [not moving] will not begin to move until a force acts on them
Objects in motion will not stop moving until a force acts on them
Objects with more mass have more inertia
Bigger objects are harder to start and stop
Eureka Inertia

22. Second Law of Motion Law of acceleration
A force is needed to change motion
Objects accelerate in the direction of the force
The more force applied, then more acceleration
The more mass an object has, the more force is needed to accelerate the object
Eureka Mass

23. Newton’s Second Law of Motion
States that the acceleration of an object is in the same direction as the net force on the object.
Net Force Equation
F = m x a
Force (Newton) =
mass (Kg) x acceleration (m/s2)

24. Third Law of Motion Law of action-reaction Forces occur in pairs
The forces are equal and opposite
One force is an action force
The other force is a reaction force
The forces act on different objects

25. bill nye momentum

26. Momentum
Every moving object has momentum. It is the amount of force required to change its motion.
momentum (kg m/s) = mass (kg) × velocity (m/s)
p = m × v
If a car has a mass of of 1100kg and is traveling at 25m/s what is its
momentum?