Gen Physics Exam 2 Misconceptional

there is no net force on the book: there are forces but ONLY in y-direction forces

zero: puck moving at constant velocity so no acceleration = no net force

no net force acted on it: when bus stopped book continued forward in initial state of motion

a net force acted on it all along

continue with constant velocity: release no force in x-direction so continuous movement with constant velocity as moment of release

push cart continuously: maintain applied force so continue pushing

moves backward at constant speed

8 seconds

200 m x= ½ aT²

25m<x<50m

70km/hr

½ v

2/3 a1

Fg is greater on stone

is equal both ways

the same

N=mg

N> mg

case 1

Case A

the rope actually pulls you up

the forces are equal

accelerations are opposite, but bigger for the ping-pong ball

both the same

the car

case A

1/3 F

100 N

100 N

tie the rope to a tree and you both pull from the same end

along horizontal component of the tension force

you are thrown to the right

the door is exerting a leftward force on you

friction between tires and road is not strong enough to keep car in circle

path 2 no longer force to keep in circle NL1

4) T_2 = 2T

1 since normal force of wall provides centripetal force to keep going around

N is smaller than mg

F_c = mg - N

Fc = T+mg

the pull on each other equally

one quarter

less than

¼

none of the above

while gravity is trying to pull them inward, they are trying to continue on a striaght-line path

smaller value

path 2

no net force acted on the box

Us > Uk so static friction is better

pulling her from the front

the box doesn’t move

both 1 & 3

slide down at constant speed