Newton’s Laws of Motion

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Newton’s Laws of Motion Quiz Review Answers

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Presentation transcript:

Newton’s Laws of Motion J. Sebastian Oddone District Supervisor

Objectives The objectives of this lesson are to understand: What is a force?, specifically Gravitational force Review of Newton’s Laws of Motion The relation between force and motion

SC.C.2.2.4 The student knows that the motion of an object is determined by the overall effect of all the forces acting on the object. (Assesses C.2.2.2 and C.2.2.3)

Newton’s III Laws of Motion: Law of Inertia: An object at rest will remain at rest unless acted upon by an external and unbalanced force. An object in motion will remain in motion unless acted upon by an external and unbalanced force. Law of Acceleration: The rate of change of momentum of a body is proportional to the resultant force acting on the body and is in the same direction. Law of Reciprocal Action: All forces occur in pairs, and these two forces are equal in magnitude and opposite in direction.

1st Law: Block on a frictionless surface An external force caused the block to move. In this case the block is at rest and would stay at rest, but…

1st Law: Block on a surface (with Friction) In this case two external forces act on the box, the hand and the friction on the surface. One force makes the block move, while the other force causes the block to stop

= F ma m 2nd Law: Block on a frictionless surface In this case the block is at rest and would stay at rest, but a force causes the mass to accelerate in the direction of the applied force

3rd Law: Block on a table on the Earth Contact forces (Electromagnetic Fields) Field forces (Gravitational) m Earth

FT/B FG/T FB/T FT/G 3rd Law: Block on a table on the Earth Contact Forces Table Box Ground FT/B m FG/T FB/T FT/G Earth

FB/E FT/E FE/B FE/T 3rd Law: Block on a table on the Earth Gravitational Field Forces Table Box Earth FB/E m FT/E FE/B Is there a gravitational force between the box and the table? Since both objects have mass, the answer is yes. The box has a gravitational force pulling on the table, and the table has a gravitational force pulling on the box. FE/T Earth