forces and motion
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7/17/2019 Forces and Motion
http://slidepdf.com/reader/full/forces-and-motion-568c263dc2d54 1/5
Forces and Motion
7/17/2019 Forces and Motion
http://slidepdf.com/reader/full/forces-and-motion-568c263dc2d54 2/5
Force
• A push or pull upon an object resulting from theobject's interaction with another object.
• measured in Newton[N]
Newton’s econd law of motion !
• "hen two or more forces act upon a bod# then
there e$ists a resultant force on that bod#. % &alanced ! N(at rest )constant speed along astraight line
% *nbalanced
F+ma
7/17/2019 Forces and Motion
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• "eight(",! Force of gra-it# that acts upon
a bod#.
% measured in Newtons[N]
• acceleration due to gra-it# (g,! Acceleration
caused b# pull of arth's gra-it#[m)s/]
• mass remains same but 'g' differs on moon
and other planets and hence weight changes
W =mg
7/17/2019 Forces and Motion
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• 0erminal -elocit#!
• Momentum ! m $ -[1gm)s]
• 2rinciple of con-ersation of momentum!0he total momentum of two objects before
collision is e3ual to the total momentum after
collision
• 4mpulse ! F $ t [Ns]4mpulse is the change in momentum
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