contact force of a surface pushing against object (ALWAYS PERPENDICULAR to surface)
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.
D
drawing
draw
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.
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
Forces are balanced if:
a) rightward forces are balanced by leftward forces b) upward forces are balanced by downward forces
draw
B
draw
contact force that ALWAYS acts in opposite direction of sliding motion (or potential motion) between surfaces
Friction
B
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