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Newtons Laws

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Newton’s Laws

Instructions: Complete all of the questions below. Be sure to show all of your work including listing the information you have been given, stating the values you are trying to find and the equations you are using, and providing your solution. Where appropriate, diagrams should be included.

1. A force of 250 N is used to push a heavy box down the street. If the force of friction between the box and the street is 195 N and the box has a mass of 60 kg, what is the acceleration of the box?
250-195=55N right
Fnet=ma
55N=60a
55 / 60=a
0.92 m/s^2 2. A force of 40 N is applied to a 6 kg box of books. If the frictional force acting on the box is 16 N, and the box was initially at rest, what is the velocity of the box 10 s later? What is the box’s displacement over the 10 s period?
40-16=24= Fnet
Fnet=ma
24=6a
24 / 6= a
4m/s^2= a

Vf=vi+at vf=0+4 (10)
Vf=40m/s

D=VT
D=40 (10)
D=400m

3. Harry is pushing a car down a level road at 2.0 m/s with a force of 243 N. The total force acting on the car in the opposite direction, including road friction and air resistance, is which of the following? a. Slightly more than 243 N. b. Exactly equal to 243 N. c. Slightly less than 243 N. The answer is b because there is constant velocity there is no acceleration so it cannot be less than because it would provide a fnet which means there's acceleration. Also can't be more than 243 because it would be moving backwards. 4. A 0.50 kg model rocket accelerates from 20 m/s [up] to 45 m/s [up] in 0.70 s. Calculate the unbalanced force acting on it. vf=vi+at 45=20+a (0.70)
45-20 / 0.70=a
35.71 m/s^2

fnet=ma fnet=0.50(35.71) fnet=17.855 fnet=18 N 5. A fully loaded Saturn V rocket has a mass of 2.92 x 106 kg. Its engines have a thrust of

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