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FORCES: FORCES - AN INTRODUCTION (GRAVITY (force of attraction between all…
FORCES: FORCES - AN INTRODUCTION
SCALAR AND VECTOR QUANTITIES
scalar quantity: magnitude (size) only
vector quantity: magnitude and direction
arrows
can be used to represent vector quantities
length represents the magnitude
direction represents the direction of the vector quantity
forces are vector quantities
CONTACT AND NON-CONTACT FORCES
force occurs when two or more objects interact
contact forces: objects are physically touching
non-contact forces: objects are physically separated
contact forces
friction
air-resistance
tension
normal contact force
non-contact forces
gravitational force
electrostatic force
magnetic force
GRAVITY
force of attraction between all masses
the force of gravity close to earth is due to the gravitational field strength around the planet
the mass of an object is related to the amount of matter it contains and is constant
weight is the force acting on an object due to gravity
the weight of an object depends on the gravitational field strength at the point where the object is and is directly proportional to its mass
weight = mass x gravitational field strength
RESULTANT FORCES
when more than one force acts on an object, these forces can be seen as a single force that has the same effect as all the forces acting together
VECTOR DIAGRAMS
free body diagram: used to show different forces acting on an object
scale vector diagrams: used to illustrate the over
KEY WORDS