JP © 1 2 3 4 (1686) Philosophiae Naturalis Principia Mathematica In this work, he proposed three “laws” of motion:

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Presentation transcript:

JP © 1

2

3

4 (1686) Philosophiae Naturalis Principia Mathematica In this work, he proposed three “laws” of motion:

JP © 5 NEWTON’S FIRST LAW : “Every body continues in a state of rest or uniform motion in a straight line unless impressed forces act upon it.”

JP © 6 parked up NEWTON’S FIRST LAW : “Every body continues in a state of rest or uniform motion in a straight line unless impressed forces act upon it.”

JP © 7 AAAAAAA H STATE OF RESTUNLESS ……. !

JP © 8 NEWTON’s FIRST LAW YOU UNDERSTAND WHAT I AM SAYING … constant velocity, unless ……..

JP © 9 NEWTON’s FIRST LAW INTRODUCES THE IDEA OF INERTIA THE RELUCTANCE OF A BODY AT REST TO MOVE (OR OF A MOVING BODY TO CHANGE ITS STATE OF MOTION) THE PRACTICAL MEASURE OF INERTIA IS MASS

JP © 10 The greater the mass of a body, the greater its INERTIA Make me

JP © 11 pivots Direction of motion seat belt Car stops but inertia carries pendulum forward locking rod ratchet wheel

JP © 12 WHEN FORCES ARE BALANCED OBJECTS AT REST, STAY AT REST OBJECTS IN MOTION, STAY IN MOTION [SAME SPEED & DIRECTION]

JP © 13 A body is in a state of equilibrium if the forces acting on it are in balance 8 N 2 forces balanced 8N forces balanced

JP © 14 THERE ARE TWO CONDITIONS FOR A BODY TO BE IN EQUILIBRIUM: THE SUM OF THE FORCES IN ANY DIRECTION IS ZERO THE SUM OF THE MOMENTS ABOUT ANY POINT IS ZERO

JP © 15 CAN YOU EXPLAIN WHAT HAPPENS BELOW?