# Force and Motion

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```					                                            OPERATION PHYSICS               FORCE & MOTION          MATRIX

I. Space

A. Space is 3-dimensional.

1. Focus on Physics: Space                                                 Disc.             U      10 min.

B. Both distance and direction are needed to describe the location of an object in space.

1. Where Is It?                                                            Lab               L      30 min.
2. The Treasure Hunt                                                       Lab               L      30 min.
3. The Traveling Washer                                                    Lab               U      30 min.

II. Time
A. Time is needed to describe the rate at which changes occur.

1. Focus on Physics: Time                                                  Disc.             U      10 min.
2. Why and How Humans Tell Time                                            Lab               L/U    15 min.

B. Any event that occurs at regular intervals can be used to measure longer intervals of time.

1. Measuring Elapsed Time With a Pendulum                                  Lab               L/U    40 min.

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OPERATION PHYSICS               FORCE & MOTION              MATRIX
III.Speed and Velocity

A. Average speed is calculated by dividing distance traveled by the elapsed time. It does not include the direction of travel.

1. Finding Average Speed                                                    Lab                   L/U     45 min.
2. Predicting an Unknown Position                                           Lab                   L/U     45 min.
3. Predicting an Unknown Time                                               Lab                   L/U     45 min.
4. Can You Walk at a Constant Speed?                                        Lab                   L/U     45 min.
5. How Fast Can You Run?                                                    Lab                   L/U     45 min.
6. How Fast Is It?                                                          Disc.                 U       30 min.

B. Average velocity is calculated by dividing displacement by elapsed time. It is a vector so it includes the direction of travel

1. Velocity Isn't Speed                                                     Lab                    L/U     30 min.
2. Walking Around a Square Lab                                                                     L/U     30 min.
3. The Flying Plane                                                         Disc./Demo             L/U     30 min.
C. Instantaneous speed and velocity describe the motion at a specific instant.

1. interstate Highway Story                                                 Disc.                 L/U     10 min.
2. Speed and Velocity                                                       Disc./Demo,           L/U     30 min.
3. Speeding Up                                                              Lab                   L/U     40 min.

IV. Acceleration

A. An object accelerates when it changes speed. Acceleration is a vector which does not always point in the direction of motion.

1. Rolling on an Inclined Plane                                             Lab                   U       40 min.
2. Speeding Up and Slowing Down                                             Disc.                 U       30 min.
3. Classifying Motion                                                       Lab                   L/U     45 min.

B. Because acceleration is a vector, an object which changes direction is accelerating even if it is not changing speed.

1. Acceleration in Circular Motion                                          Lab                   L/U     20 min.
2. Acceleration When Speed and Direction Change                             Lab                   L/U     30 min.

C. The units of acceleration show that it is calculated by dividing the change in velocity by the elapsed time.

1. Focus on Physics: Acceleration Units and Their Meaning                   Disc.                 U       10 min.

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OPERATION PHYSICS                FORCE & MOTION   MATRIX
V. Motion When No Forces Act (Inertia)

A. When an object is at rest the forces acting on it are in balance.

1. Motion and Force                                                            Disc            15 min
2. The Coin and The Glass                                                      Lab      L/U    20 min

B. Objects in motion will not change velocity when there is no net force acting on them.

1. Inertia                                                                     Lab      LIU    20 min
2. Inertia-Newton's First Law of Motion                                        Disc            15 min
3. Riding on Air                                                               Lab      L/U    30 min

VI. Forces in Balance

A. When an object is at rest the forces acting on it are in balance.

1. Finding the Forces                                                          Lab      U      90 min
2. Elasticity                                                                  Lab      U      40 min
3. The Undercover Scale                                                        Disc            15 min

B. When an object has a constant velocity the forces acting on it are in balance.

1. Balanced Vertical Forces                                                    Lab      LIU    20 min
2. Balanced Horizontal Forces                                                  Lab      L/U    20 min

C. The force of friction is not a fixed force. It both hinders and helps motion.

1. How Strong Is Friction?                                                     Lab      L/U    20 min
2. What Happens to the Speed of the Marble?                                    Lab      U      30 min
3. How Can You Reduce Frictional Force?                                        Lab      L      20 min
4. What is Frictional Force?                                                   Disc            10 min
5. Why Do You Oil Machines                                                     Disc            10 min
6. Why Use Wheels?                                                             Disc            10 min

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OPERATION PHYSICS                FORCE & MOTION               MATRIX

VII. Unbalanced Forces Cause Acceleration ( A is proportional to Net Force)

A. When the net force is parallel to the motion, an object accelerates in a straight line. The value of the acceleration is proportional to the net force.

1. Force and Acceleration                                                    Disc                          10 min
2. Acceleration is Proportional to Net Force                                 Lab                    U      30 min
3. Paper and Book Drop                                                       Disc                          10 min
4. The Falling Cup                                                           Disc                          10 min

C. When the net force is perpendicular to the motion, an object moves in a circle at constant speed. This is an accelerated motion.
1. Force on a Rope                                                           Lab                  L/U 20 min
2. A Circle of People                                                        Disc                          15 min
3. Dead man's Curve                                                          Lab                  LIU 20 min
4. The Spinning Stopper                                                      Lab                  U        30 min
5. Centripetal Force and Circular Motion                                     Disc

A. There is only two basic types of force: gravity and electromagnetism.

1. Types of Force                                                            Disc                          15 min

B. Forces always come in pairs. One force in the pair is always equal and opposite to the other.

1. Who Exerts the Greater Force?                                             Disc                   L/U    45 min
2. Are Forces Equal in a Collision?                                          Disc                   L/U    45 min
3. Which Magnet Pushes Harder?                                               Disc                   L/U    15 min
4. Which Rubber Ban Exerts the Greater Force?                                Lab                    L/U    30 min
5. Sprinklers and Rockets                                                    Disc                   LIU    20 min
6. Forces and Rockets                                                        Lab                    L/U    30 min
7. Newton's Third Law                                                        Disc                          15 min
8. Is Pressure the Same as Force?                                            Lab                    L/U    15 min

C. Review

1. Playground Physics                                                        Disc                          20 min

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