mass + gravity
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what is mass?
• mass is the amount of matter an object contains • inertia applies to all forms of mass • base units are kilograms/kg
what is weight?
weight is the gravitational force acting upon an object, in the case of earth, 9.8N per kilogram
what is gravity?
gravity is a force that acts between any 2 masses
which two factors affect gravitational attraction between two objects?
• mass • distance
general rules of gravity
• if mass increases, the force of gravity increases • if distance increases, the force of gravity decreases
formula for finding gravitational pull of two objects
F = G x [(m1 x m2)/d x d]
what is the universal gravitational constant?
6.67 x 10*-11
what is the gravitational acceleration near the earth’s surface?
9.8 ms*-2
why is the gravitational acceleration constant, even though the mass of different objects are different?
the gravitational constant is 9.8N ms*-2, therefore for every kg, 9.8N will be applied.
what is drag force?
resistance forces created by air, water, etc.
drag vs acceleration
the faster an object falls the greater the drag
what is terminal velocity?
if an object falls for long enough, the drag will equal the weight of the object, causing the object to fall at a constant speed. this is called terminal velocity
what are some factors which affect drag?
• surface area/shape • size/volume • sped