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AP physics

QuestionAnswer
When you don't know distance v_f=v_i+at
When you don't know final velocity x_f=x_i+v_i*t+1/2*a*t^2
When you don't know time v_f^2=v_i^2+2a(x_f-x_i)
Net force F_net=ma
Net force vectors F_net_x=ma_x F_net_y=ma_y
Kinetic friction force F_k=μ_k*N
Static friction force F_s=μ_s*N
Which is always bigger μ_s > μ_k
Parallel component F_g_x=mg*sinθ
Perpendicular component F_g_y=mg*cosθ
Normal force N=mg*cosθ
Kinetic or Static fiction force on a slope F_k=μ*mg*cosθ
Atwood machine when m_1 > m_2 a=(m_1-m_2)g/(m_1+m_2)
Critical angle tan⁻¹(μ_s)
Normal force symbol N
Tension force symbol T
Friction force symbol F_f
Applied force symbol F_app
If no motion in a direction a=0, so F_net=0
Connected objects total mass Total mass= sum of all masses
Connected objects acceleration a=F_external/m_total
Individual approach F Apply F=ma to each
F_app pulling at an angle upwards vertical component F_app*sinθ (reduces N)
F_app pulling at an angle upward normal force N=mg-F_app*sinθ
F_app pulling at an angle upward force of kinetic or static friction F_f=μ(mg-F_app*sinθ) (less friction)
F_app pulling at an angle downwards vertical component F_app*sinθ (increases N)
F_app pulling at an angle downward normal force N=mg+F_app*sinθ
F_app pulling at an angle downward force of kinetic or static friction F_f=μ(mg+F_app*sinθ) (more friction)
Elevator constant speed T=mg
Elevator accelerating up T=m(g+a) (heavier)
Elevator accelerating down T=m(g-a) (lighter)
Free fall T=0
Newtons 3rd law, forces come in pair Equal magnitude, Opposite direction, and acts on different objects
Spring constant symbol k
Spring force F_s=k*x
Spring constant k=F_s/x
Spring series k_total=(1/k_1)+(1/k_2)
Spring parallel k_total=k_1+k_2
Static equilibrium net force components F_nety=T_1y+T_2y=mg F_netx=T_1x=T_2x
Static equilibrium net force cos and sin T_1*sinθ_1+T_2*sinθ_2=mg T_1*cosθ_1=T_2*cosθ_2
Created by: AP12345
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