Prior to this section, we did not ask any questions about what causes the motion of objects to begin or to change. In this section, we will use Newton's second law develop a cause and effect relationship between forces and motion. Newton's second law can be stated as follows:
**NOTE: Just like kinematics, the rest of PH201 works under the point particle approximation. Thus, we will not need to worry about the center of mass yet. But in PH202, will will start to consider the physical shape of objects, requiring us to determine center of masses.
Check out this NASA video introducing the concept of Newton's Second Law
Big Ideas
Big Idea 1: Objects and systems have properties such as mass and charge. Systems may have internal structure.
Big Idea 3: The interactions of an object with other objects can be described by forces.
Big Idea 4: Interactions between systems can result in changes in those systems.
Learning Objectives
BoxSand Learning Objectives
- Demonstrate the ability to determine the direction of the net force based off the direction of acceleration, or vice versa. More general: Be able to link the direction of two vectors that are related to each other by a scalar.
- Understand the meaning of "net" when applied to vectors.
- Reinforce the ability to add and subtract vectors by summing the forces acting on an object.
- Connect the motion of an object (kinematics) with the forces acting on the object.
- Reinforce the ability to decompose vectors into components.
- Understand that forces are used to describe the interaction between two objects.
- Understand that forces are used to describe the cause of the departure from the first law's equilibrium condition.
College Board Learning Objectives
Enduring Understanding and Essential Knowledge
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Enduring Understanding |
Essential Knowledge |
Assumptions
Describe what the assumptions are and why they're important
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History
Physics Fun
Demonstration of how force is dispersed throughout an object: https://www.youtube.com/watch?v=XhudOIrANXs
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