Forces and Motion. May 10, 2017

Transcription

1 Forces and Motion May 10, 2017

2 Forces in Motion- Key Vocabulary Gravity Mass Weight Motion Friction Axis Potential Energy Kinetic Energy Acceleration Velocity Distance Position Direction Speed Momentum Forces Unbalanced Forces Balance Forces Inertia Qualitative Data Quantitative Data

3 What is the relationship between force and motion? (Turn and Talk)

4 Forces and Motion Introduction Video- DE May 10, 2017

5 What is Motion? * Coach Book- Page 10 (Read together and discuss position, distance and motion) True or False? Nothing in the universe is at rest. (Example- If you are reading a book in a car, you think the book is not moving, but someone watching you drive by sees the car moving, so the book is also in motion.)

6 Study Jams Video May 10, 2017

7 Forces can affect motion in several ways: * They can make objects start moving. * They can make objects move faster. * They can make objects move slower. * They can make objects stop moving. * They can make objects change direction. Car Demo

8 *Coach Book- Page 23-middle of 24* (Read whole class- stop and jot) Study Jams Video

9 How is weight affected by the pull of gravity? (Turn and Talk) * The heavier an object weighs, the greater the gravitational pull is on the object. * Weight is the gravitational force on an object.

10 What is Friction? May 10, 2017

11 Friction has an Affect of you? Friction is the motion that slows down the motion of two objects that are rubbing together. Rubbing together some wood at a very fast motion creates lots of friction which turns to heat and can turn to fire.

12 Friction in Your World... When a soccer ball moves over a surface, it becomes slower and slower till it finally comes to rest. This is because of friction between the ball and the grass. This friction works against the motion of the ball.

13 Fantastic Friction PEGHER 500 The Context: Winning a NASCAR race depends on may factors, including the speed at which the race car can perform. Car designers and engineers need to create cars that help the driver win the race. The Situation: You are a member of a race car design team. The car you have been given was previously used on a farm. Your team needs to modify the car to increase the speed and distance the car can travel in a 5 second time period. Limitations: Each modification must be tested in a fair test and contain at least 3 trials. A graph of results must be created. The road surface may not be altered. The car must carry the weight of 2 quarters (weight of driver) Rules: You must modify your car at least 2 times. All cars must start from a ramp height of 6 inches, using the ramp provided. You may alter your car by adding or subtracting parts.

14 Balanced and Unbalanced Forces * What does it mean to have a balanced or unbalanced force? Example- Tug of War in classroom (between students)

15 Balanced forces- equal in size and opposite in direction (they cancel each other out). No change in motion. If the object is moving it will continue moving at the same speed and in the same direction. Unbalanced forcesunequal force; one force is greater than the opposite force. These ALWAYS cause a change in motion.

16 Newtons 3 Laws Isaac Newton & Worm Website

17 1st Law of Motion An object at rest will remain at rest, and object in motion will continue moving in a straight line at a constant speed until and outside force acts on it. Study Jams Video

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19 2nd Law of Motion An object's acceleration depends on the size and direction of the force acting on it and on the mass of the object. Force=Mass + Acceleration Study Jams Video

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21 3rd Law of Motion For every action, there is an equal and opposite reaction. Study Jams Video

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24 What is speed? It is a measure of how far an object moves in a certain amount of time. Refer to the Coach Book- page 11-12

25 Speed= Distance / Time May 10, 2017

26 Describing Motion- Skating in the Park with Tammie Task *Steps 1-6

27 Whole Class- Come together and discuss what was learned from this task. Velocity- the speed and direction an object is going Momentum- how hard it is to start or stop an object. Examples- Football players, 18- wheelers, Mario Cart, Train, etc.

28 Describing Motion- Skating in the Park with Tammie Task *Explain Page #1-3

29 DISTANCE-TIME GRAPHS Plotting distance against time can tell you a lot about motion. Let's look at the axes: Time is always plotted on the X-axis (bottom of the graph). The further to the right on the axis, the longer the time from the start. Distance is plotted on the Y-axis (side of the graph). The higher up the graph, the further from the start.

30 If an object is not moving, a horizontal line is shown on a distance-time graph. May 10, 2017

31 If an object is moving at a constant speed, it means it has the same increase in distance in a given time: Time is increasing to the right, and distance is increasing constantly with time. The object moves at a constant speed. Constant speed is shown by straight lines on a graph.

32 Let s look at two moving objects: Both of the lines in the graph show that each object moved the same distance, but the steeper dashed line got there before the other one: A steeper line indicates a larger distance moved in a given time. In other words, higher speed. Both lines are straight, so both speeds are constant.

33 Graphs that show acceleration look different from those that show constant speed. The line on this graph is curving upwards. This shows an increase in speed, since the line is getting steeper: In other words, in a given time, the distance the object moves is change (getting larger). It is accelerating.

34 Examine the following graphs. Which of the graphs shows that one of runners started 10 yards further ahead of the other? Explain your answer.

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36 Answer: Graph A May 10, 2017

37 In which of the following graphs below are both runners moving at the same speed? Explain your answer.

38 Answer: Graph C May 10, 2017

39 Quizlet- Distance Time Graphs Page Ms. Stout's Page- " Determining Speed and Distance"

40 Unit Test May 10, 2017