Balanced and Unbalanced forces DN and RKS Check

Balanced and Unbalanced forces

DN and RKS

Check RKS

answers 1) Speed = total distance/time 3) Acceleration = change in velocity/time 5) m/s 7) m 10) velocity 2) Velocity = displacement/time 4) m/s 2 6) m/s 8) s 11) acceleration

RKS 11) A boy skates with a velocity of 6 m/s for 12) A boy skates with a velocity of 6 m/s and 15 seconds. How far does he go? accelerates to a velocity of 12 m/s over 25 m. How long did this take? V= 6 m/s T= 15 s D =? Vi= 6 m/s Vf= 12 m/s D= 25 m V=displacement/time T=? ? ? 13) A balloon starts from rest rises with an 14) A balloon starts from rest rises with an acceleration of 0. 2 m/s 2 for 10. seconds. How far will the balloon travel during What was the final velocity of the this time? balloon? A= 0. 2 m/s 2 T= 10 Vi= 0 D= ? ? ? A= 0. 2 m/s 2 T= 10 Vi= 0 Vf= ? ? ?

Review DN 2 a) Q Final speed U m/s I vi= 30 m/s, a= 2 m/s 2, t=4 s a= 2 m/s 2 D t= 4 s vi= 20 m/s S vf= ? ? m/s 1 FOR Vi, a, vf, , t M Vf=30 m/s + (2 m/s 2)(4 s) = 38 m/s E 1 sf = 40 m/s, seems fast, but reasonable and units are correct

Review DN 2 b) Q Distance traveled U m I vi= 30 m/s, a= 2 m/s 2, t=4 s a= 2 m/s 2 D t= 4 s d = ? ? ? vi= 20 m/s S 1 FOR Vi, a, d, t M d=(30 m/s)(4 s) + 1/2(2 m/s 2)(4 s)2= 136 m E 1 sf = 140 m/s, reasonable and units are correct

Review DN �A= change in v/time �=(25 m/s-5 m/s)/(5 s-0 s) =(20 m/s)/(5 s) �=4 m/s 2

Review DN

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