1. Today you need pencil, science notebook, study guide Learning Target – I will be able to understand the relationship between forces and motion of an object. rate yourself a 1, 2, 3, or 4 and why. We will do this Mon, Tues and Wednesday as we prepare for the unit test. Bell work – How can what you have learned about Newton’s Laws of Motion be used in real life?

2. 1- Student can observe an object’s motion but cannot explain the forces behind the motion. 2 -Student can explain motion of an object using Newton’s Laws of motion and the interactions between objects and force, using terms such as: velocity, acceleration, unbalanced force, action/reaction pairs. 3 - Student can understand how Newton’s Laws of Motion apply to every object and understand a distance-time graph to explain motion of an object.

3. 4 - Student can analyze the spatial relationships between objects and the way objects move using Newton’s Laws of Motion, along with creating your own graphic representation.

4. Motion Notes Position- Of a place or an object is the location of that place or object. (practice with shoulder buddy) Motion-A change in position, over time, relative to a reference point. Reference Point- A location in which you compare other locations to.

5. Average Speed Vocabulary Average Speed An average of all speeds over a given time. S = D/T © KeslerScience.com

6. Suppose there’s a TORNADO that’s 1 mile wide, and it’s going 40 mph… What else is important?!?!? It’s Direction! Velocity is a Speed in a Direction! 15 Mph Northwest; 200 m/s South; 40 cm/ms Left Velocity

7. Average Speed Speed on a Distance-Time Graph Constant speed – straight diagonal line The steeper the line the greater the speed No speed – straight horizontal line © KeslerScience.com No speed Stationary Slow constant speed Fast constant speed

8. Average Speed Practice Problem: What is the average speed of a car during the two trials, to the nearest 10th ? S = D/T average speed = total distance / total time 5.0 m + 7.6 m = 12.6 m 3 s + 6 s = 9 s 12.6 m / 9 s = 1.4 m/s TRIAL 1TRIAL 2 TIME (sec)DISTANCE (m)TIME (sec)DISTANCE (m) 35.067.6

9. Acceleration Change in Velocity over time “Speeding Up” = Acceleration (Positive #) “Slowing Down” = Deceleration (Negative #) Turning (Change in Direction) = Acceleration Zero acceleration = constant speed

10. Calculating Acceleration Final Velocity – Initial Velocity Time V final – V initial T

11. Centripetal Force Vocab: Centripetal force – any force that keeps an object moving in a circle. Centripetal Force/Circular Motion and Newton’s Second Law – pages 54 & 55.

12. Centripetal force – Some main ideas … If an object is moving in a circle, its force and acceleration are directed towards the center of the circle Newton’s 2 nd Law applies to centripetal force (F = ma) Centripetal force consistently changes an objects direction demo

13. Momentum - This is a characteristic of a moving object related to its mass and velocity. Formula = Momentum = mass x velocity p = m x v Unit for momentum – kg m/s

14. Newton’s Third Law or the Law of Action/Reaction For every action there is an equal in size and opposite in direction reaction. Ex. – A rocket taking off Newton's Laws of Motion © KeslerScience.com

15. Questions? Math practice Kahoot when done