5 Newton’s Third Law of Motion

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Presentation transcript:

5 Newton’s Third Law of Motion Force interactions & Newton’s 3rd Law Systems Vectors, Components & Vector Addition Homework: RQ: 4, 5, 10, 11, 12, 13, 15, 17, 20, 21. Ex: 13, 22, 30, 38, 39, 43, 44, 45, 48. Problems: 1, 2, 3, 4.

Forces and Interactions inter = between all forces are interactions between masses each mass feels same size force

Newton’s 3rd Law of Motion Whenever one object exerts a force on a second object, the second object exerts an equal and oppositely directed force on the first.

Systems (net-external force on a system) = (mass of system)x(acceleration of system). often defined so unknown forces can be determined, e.g., tension can be determined below.

What external forces act on this system? Can the system move?

What forces act on the man? Draw a Force Diagram for him.

Summary of Newton’s Laws 1st: Fnet = 0  constant velocity 2nd: Fnet = ma 3rd: Forces occur in pairs (equal size, opposite direction)

Newton’s 3rd Law Pair Notation use “x” marks on forces that are 3rd Law pairs. Remember: There will never be two “x” marks on one motion diagram. The other “x” will be on force diagram of other object. Use “xx” for a different interaction, etc.

Force Diagram each object. Which has greater acceleration when released?

Pract. Physics: Page 21 #2(at bottom)

Vector Addition addition is done tail-to-head, also called “parallelogram rule” added to determine net force if net force is known, we use vector addition to determine components, e.g. lantern hanging from two ropes. //

Which strings have greater tension?

Add Velocities to Find Speed & Direction

Diagonal of Square is 1.41 times its sides

3-4-5 Rule

Components of Vectors component = part horizontal part is the “x component” vertical part is the “y component”

Practical Vector Addition

Summary All forces are interactions, i.e., part of a pair of forces Newton’s 3rd Law: pairs have equal size opposite direction Systems are defined to determine unknown forces Vectors, Vector Components, Parallelogram Rule

Practicing physics Do Page 27 Refer to page 26 to review parallelogram rule of vector addition

Action and Reaction