- A staging that weighs 300 N supports two painters, one 250 N and the other 300 N (see above). The tension on the left rope is 400 N. What is the tension in the right rope?
Your answer:
850 N
500 N
450 N
400 N
- The rope under the most tension due to the hanging mass in the three diagrams above is.....
Your answer:
the diagram with the smallest angle between the two strings
the diagram with the strings not too far apart and not too close together
the diagram with the largest angle between the two strings
the string in all three diagrams is under the same tension
- A 2kg mass is suspended between two strings held in tension. Spring scales A and B are used to determine the tension in each string. Determine the readings of both scales.
Your answer:
A: 28.0 N B: 34.2 N
A: 34.2 N B: 28.0 N
A: 13.7 N B: 11.2 N
A: 11.2 N B: 13.7 N
- Which block above has the greatest normal force acting on it as it moves down the frictionless hill?
Your answer:
b
c
a
d
- The diagram above shows a block sliding down a frictionless ramp. At which position is the force of gravity acting on the block the greatest?
Your answer:
a
c
all positions are the same
b
- Which of the free-body diagrams above correctly represents a car going downhill without acceleration?
Your answer:
3
4
2
1
- In which of these hills above does the ball roll down with increasing speed and decreasing accleration along the path?
Your answer:
A
B
C
A and C
- The diagrams above show a plane being blown off course by wind in various directions. In which case does the airplane travel fastest across the ground?
Your answer:
b
d
c
a
- The diagram above shows three motorboats crossing a river. All boats have the same speed relative to the water, and all experience the same water flow. Which boat reaches the opposite shore first?
Your answer:
b
a
c
they all reach the shore at the same time
- Which of the sailboats above travels the fastest?
Your answer:
5
1
3
4
- The blocks shown above in the figures have equal masses and are made of the same material. The velocity is the same in each figure. The total frictional force exerted by the surface is...
Your answer:
the same in Figure A and Figure B
greater in figure C than in Figure A or Figure B
the same in Figures A, B, and C
the same in Figure C and Figure B
- A worker rolls a 50.0-kg barrel at constant speed up a frictionless incline. A diagram of the situation and a free-body diagram is shown above. The angle of the ramp is 30 degrees wrt the horizontal. The force he must apply to roll the barrel up the ramp is....
Your answer:
50 N
424 N
490 N
245 N
- The diagram above shows a crate moving at constant speed. The amount of friction (f) is....
Your answer:
slightly less than that at which the man is pulling (P)
the same as the normal force (N)
none of these answers
the same as the weight (W)
- A 17 kg tire is tested by pulling it horizontally across asphalt. It is started from rest and then pulled at constant speed.. The graph above is produced. Determine the coefficient of kinetic friction between the tire and the asphalt.
Your answer:
0.7
0.9
0.8
1.0
- The free-body diagram above is for a parachutist who is just opening the parachute. If the mass of the jumper is 120 kg and he encounters 1300 N of air resistance, determine his acceleration at this time. (g=9.8 N/kg)
Your answer:
1.0 m/s/s downwards
1.0 m/s/s upwards
9.8 m/s/s upwards
10.8 m/s/s downwards
- When the parachute in question 15 fully opens what will happen to his accleration?
Your answer:
It becomes more and more negative
It becomes more and more positive
It becomes more negative and then goes to zero
It becomes more negative and then goes to zero
- Two balls are released simultaneously from rest at the left end of equal length tracks A and B as shown. Which ball reaches the end of its track first?
Your answer:
no answer
A
B
They reach the end at the same time
- Two 100 N weights are attached to the spring scale as shown. What does the spring scale read?
Your answer:
Other reading
0 N
100 N
200 N
- An ice sailcraft is stalled on a frozen lake on a windless day. The skipper sets up a fan as shown above. If all the wind bounces backward from the sail, will the craft be set in motion?
Your answer:
yes, the wind will push on the sail when it bounces
yes, the sail has an nbalanced force acting on it
no, the sail pushes just as much back on the wind as the wind pushes on it
no because of action and reaction forces on the fan
- The strong man will push two initially stationary freight cars of equal mass apart before he himself drops straight to the ground. Is it possible for him to give either of the cars a greater speed than the other?
Your answer:
Yes, if one arm is stronger than the other
No, the action on one truck produces an equal and opposite reaction on the other
No, he has the same strength in each arm
Yes, He can just push more on one side than the other