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Intro to Electric Forces
Physics 12
Unit Circle
Using the Unit Circle with Vector Components
x
y
A
Ax=Acosθ (positive)
θ
Ay=Asinθ (positive)
Practice Problems1) 4.5m/s, 27°2) 73N, 73°3) 42m, 48°
Solutions1) vx=4.0m/s, vy=2.0m/s2) Fx=21N, Fy=70N3) dx=28m, dy=31m
Using the Unit Circle with Vector Components
x
y
A
Ax=Acosθ (negative)
θAy=Asinθ (positive)
Practice Problems1) 7.3m/s, 132°2) 3.8N, 114°3) 18m, 164°
Solutions1) vx=-4.9m/s, vy=5.4m/s2) Fx=-1.5N, Fy=3.5N3) dx=-17m, dy=5.0m
Using the Unit Circle with Vector Components
x
y
A
Ax=Acosθ (negative)θ
Ay=Asinθ (negative)
Practice Problems1) 62m/s, 192°2) 112N, 256°3) 23m, 235°
Solutions1) vx=-61m/s, vy=-13m/s2) Fx=-27.1N, Fy=-109N3) dx=-13m, dy=-19m
Using the Unit Circle with Vector Components
x
y
A
Ax=Acosθ (positive)θ
Ay=Asinθ (negative)
Practice Problems1) 41m/s, 303°2) 2.6N, 294°3) 8.4m, 338°
Solutions1) vx=22m/s, vy=-34m/s2) Fx=1.1N, Fy=-2.4N3) dx=7.8m, dy=-3.1m
Angle Conversions W37°S W48°N S21°W S34°E E17°S E42°N N73°E N27°W
217° 132° 249° 304° 343° 42° 17° 117°
Electroscope
Draw a diagram showing the forces that exist on the leaves of the electroscope when it is placed close to the Van de Graff generator
Pith Ball
Draw a free body diagram of the pith ball when it is brought close to the Van de Graff generator
Do we have the skills to address this situation?