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2.1 and 2.2 AP Phy
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Steps for drawing free body diagrams:
1) draw only 1 object 2) draw 1 arrow for each force acting on object; pointing away from object 3) label each force
contact force that ALWAYS acts in opposite direction of sliding motion (or potential motion) between surfaces
Friction
Normal Force
contact force of a surface pushing against object (ALWAYS PERPENDICULAR to surface)
Forces are balanced if:
a) rightward forces are balanced by leftward forces b) upward forces are balanced by downward forces
draw
draw
draw
drawing
The Formula for COM
x cm ​ = ∑m i ​ ∑m i ​ x i
What is Center of Mass?
The center of mass of an object or system is the point where mass is evenly distributed in all directions.
B
D
D
Three particles are arranged on a coordinate system. Particle 1 has mass 2 kg and is located at (0,0) m. Particle 2 has mass 4 kg and is located at (3,0) m. Particle 3 has mass 6 kg and is located at (3,4) m. Find the coordinates of the COM
(2.5, 2) m.
B
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