REVISION NEWTON’S LAW. Quantity with magnitude and direction. e.g. displacement, velocity, acceleration, force and weight.. VECTOR Quantity having only.

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Presentation transcript:

REVISION NEWTON’S LAW

Quantity with magnitude and direction. e.g. displacement, velocity, acceleration, force and weight.. VECTOR Quantity having only magnitude, not direction. e.g. distance, speed, mass SCALAR Earth's gravitational pull on an object. It is measured in Newton WEIGHT The measure of the amount of matter contained in the object. It is measured in kilograms MASS RESULTANTE/NET VECTOR The single vector that will have the same effect as all the other vectors will have together

FORCES WEIGHT NORMAL FORCE APPLIED FORCE DIRECTION OF MOTION FRICTIONAL FORCE

FORCE DIAGRAM FREE BODYDIAGRAM

DIRECTIONS 300 o 30 o North of West West 30 o North

NEWTON'S FIRST LAW OF MOTION A body will remain in its state of rest or motion at constant velocity unless a non-zero resultant/net force acts on it.

NEWTON'S SECOND LAW OF MOTION When a resultant/net force acts on an object, the object will accelerate in the direction of the force at an acceleration directly proportional to the force and inversely proportional to the mass of the object.

NEWTON'S THIRD LAW OF MOTION When one body exerts a force on a second body, the second body exerts a force of equal magnitude in the opposite direction on the first body

NEWTON'S THIRD LAW ACTION-REACTION PAIRS 1.Same magnitude, opposite direction 2.Simultaneous 3.Only two objects

the force or the component of a force which a surface exerts on an object with which it is in contact, and which is perpendicular to the surface NORMAL FORCE WEIGHT gravitational force the Earth exerts on any object on or near its surface

the force that opposes the motion of an object acts parallel to the surface. – Perpendicular on normal force – independent of the area of contact – independent of the velocity of motion FRICTIONAL FORCE STATIC FRICTIONAL FORCE the force that opposes the tendency of motion of a stationary object relative to a surface KINETIC FRICTIONAL FORCE the force that opposes the motion of a moving object relative to a surface

Is usually given It depends on the 2 surface areas that are in DIRECT contact This is the relationship between the friction force and the normal force of an object (the coefficient of friction therefor has no unit of measure) COEFFICIENT OF FRICTION

Forces acting on an object. Pushing or pulling forces APPLIED FORCE TENSION Force in a stretched rope RESULTANT / NET VECTOR The single force that will have the same effect as all the other forces will have together

FORCE DIAGRAMS

EQUILIBRIUM NEWTON’S PROBLEMS

PERPENDICULAR FORCES (equilibrium)

‘ANGLED’ FORCES (equilibrium) A box with mass 5kg stands stationary on a horizontal plane, experiencing a 10N applied force at an angle of 30 o

ANGLED PLANES (equilibrium)

TRIANGLES for EQUILIBRIUM with THREE FORCES

non-EQUILIBRIUM NEWTON’S PROBLEMS

PERPENDICULAR FORCES (non- equilibrium)

‘ANGLED’ FORCES (non-equilibrium)

ELEVATORS

GRAPHIC SOLUTIONS NEWTON’S PROBLEMS

HEAD-TO-TAIL METHOD– EQUILIBRIUM with THREE FORCES

HEAD-TO-TAIL METHOD– EQUILIBRIUM with maximum tension/weight

GRAPHIC SOLUTIONS for NON- EQUILIBRIUM

NEWTON’S UNIVERSAL GRAVITATIONAL LAW

NEWTON'S UNIVERSAL GRAVITATION LAW Each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres

GRAVITATIONAL ACCELERATION FOR ANY PLANET

RATIO PROBLEMS

NET GRAVITATIONAL FORCE