Physics

∆x=v_i ∆t+ a (∆t)²

• displacement= net change in location
• distnce= travel path lentght

• v_f²=v_i² +2ad
• v_f=v_i+at

An object at rest remains at rest, and an object in motion continues in motion with constant velocity (that is, constant speed in a straight line) unless the object experiences a net external force.

F=ma

If two objects interact, the magnitude of the force exerted on object 1 by object 2 is equal to magnitude of the force exerted on object 2 by object 1, and these two forces are oppisate in direction.

F_f= μF_n

W=FD

W= ∆KE

• 
• K=spring constant in N/m

ME=KE+PE

ME_i=ME_f

P=MV

F∆T=∆p=mv_f -mv_i

Pi=Pf

Each planet travels in an elliptical orbit around the sun, and the sun is at one of the focal points

An imaginary line drawn from the sun to any planet sweeps out equal areas in equal time intervals

the square of a planets orbital period (T²) is proportional to the cube of the average distance (r³) between the planet and the sun, or

• 
• Period= the time it takes for one orbit
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• No work done
• ∆V=0
• so P∆V=0 and W=0
• Therefor ∆U=Q

∆U=Q-W

• No change in temperature or internal energy
• ∆T=0 so, ∆U=0; therefore, ∆U=Q-W=0; or
• Q=W

• no energy transferd as heat.
• Q=0, so ∆U= -W

U_i=U_f

• 
• A gas behaves like an Idele gas when Tempeture is high and presure is low