Month: April 2019

AP Physics Key Points 16 (Week of April 1st)

Static Equilibrium Occurs when an object is at rest and in a state of equilibrium With torque… When the net force is zero, the acceleration is zero, which means velocity is constant.  Static equilibrium occurs when the net torque is zero.  Key Points Use the center of mass for objects Choose a convenient axis of…

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AP Physics Key Points 15 (Week of March 24th)

Rotational, Energy, Work, and Power K= 1/2mv^2 or 1/2Iω ^2 K –> kinetic energy m –> mass v –> translational velocity (ω r); r is radius I –> rotational inertia ω  –> angular speed Translational W= ΔE= F∥*Δd K= 1/2mv^2 P= W/t = ΔE/t P= F(Δs/Δt)= Fv *P is power,”s” is speed, and “t” is…

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AP Physics Key Points 14 (Week of March 24th)

Torque τ= F⊥r or rFsin(Ѳ) τ –> torque F–> force r–> radius ⊥ –> perpendicular Nonzero net toque causes rotation. No net torque means no rotational acceleration. Inertia is the resistance to change Moment of inertia is the resistance to rotation. Mass is distributed to the point of rotation. When force is directed at the…

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AP Physics Key Points 13 (Week of March 18th)

More on Circular Motion Rotational Kinetic Energy Object rotating about an axis Equation: 1/2Iω^2 KE= 1/2 Mv^2cm+1/2cmV^2 Vcm–> linear velocity of the center of mass Icm–> the moment of inertia about an axis through the center of mass ωcm–> angular velocity about the axis  M–> total mass of the object Static friction must be present…

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AP Physics Key Points 12 (Week of March 18th)

Circular Motion Tangential speed–>object’s speed along an imaginary line drawn tangent to the circular path Tangential acceleration–> object’s acceleration along an imaginary line drawn tangent to the circular path–> only present when there is angular acceleration. Centrifugal (or radial) acceleration–>  the acceleration which causes the continuous change in the direction of an object. Centripetal acceleration…

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