AAPT Quiz
1999 Physics Quiz Bowl (Part 1)
1. The change of distance per unit time without reference to a particular direction is called
inertia
speed
velocity
acceleration
position
2. Which of the following terms is NOT related conceptually to the others?
vector
resultant
component
exponent
equilibrant
3. If the net force on an object were doubled while at the same time the mass of the object was halved, then the acceleration of the object is
¼ as great
½ as great
2 times greater
4 times greater
unchanged
4. If conventional (positive) electric current flows from left to right in a wire as shown in the diagram,
what is the direction of the magnetic field at point P?
toward top of paper
towards bottom of paper
into paper
out of paper
to the right
5. A tractor-trailer truck is traveling down the road. The mass of the trailer is 4 times the mass of the tractor.
If the tractor accelerates forward, the force that the trailer applies on the tractor is
4 times greater than the force of the tractor on the trailer.
2 times greater than the force of the tractor on the trailer.
equal to the force of the tractor on the trailer.
¼ the force of the tractor on the trailer.
zero since the tractor is pulling the trailer forward.
6. An airplane with air speed 120 km/h is heading due north in a wind blowing due east at 50 km/h. What is the ground speed of the plane?
60 km/h
120 km/h
130 km/h
140 km/h
None of these
7. In the absence of air resistance, if an object were to fall freely near the surface of the Moon,
its velocity could never exceed 10 m/sec
its acceleration would gradually decrease until the object moves with a terminal velocity.
the acceleration is constant.
it will fall with a constant speed.
the acceleration is zero.
8. A weight can be hung in any of the following four ways. In which case is the string most likely to break?
all the same
9. If air resistance can be neglected, what happens to the horizontal velocity component of a basketball as it is thrown to the basket from the free-throw line?
increases
decreases
decreases until the ball reaches the top then increases as the ball comes down
increases until the ball reaches the top then decreases as the ball comes down
remains constant
10. A simple machine can NOT do which of the following:
have a mechanical advantage greater than 1.
change the direction of the force.
move the resistance a greater distance than the applied force.
increase the energy put into it.
produce a force on the resistance which is greater than the applied force.
11. Assume that the Earth attracts John Glenn with a gravitational force
F
at the surface of the Earth. When he made his famous second flight in orbit, the gravitational force on John Glenn while he was in orbit was closest to which of the following?
0.95 F
0.50 F
0.25 F
0.10 F
zero
12. Two boxes are accelerated to the right on a frictionless horizontal surface as shown. The larger box has a mass of 9 kilograms and the smaller box has a mass of 3 kilograms.
If a 24 newton horizontal force pulls on the larger box, with what force does the larger box pull on the smaller box?
3 N
6 N
8 N
18 N
24 N
13. A heating coil is rated 1200 watts and 120 volts. What is the maximum value of the current under these conditions?
10.0 A
12.0 A
14.1 A
0.100 A
0.141 A
14. A construction laborer holds a 20 kilogram sheet of wallboard 3 meters above the floor for 4 seconds. During these 4 seconds how much power was expended on the wallboard?
2400 watts
320 watts
27 watts
15 watts
none of these
15. Given the graph of the velocity vs. time of a duck flying due south for the winter.
At what point did the duck stop its forward motion?
A
B
c
D
none of these points
16. Which of the following principles best explains why large tractor-trailer trucks generally accelerate much more slowly that automobiles?
To every action there is an equal reaction.
Every body attracts every other body in the universe.
A force is necessary to change the speed or direction of a body.
The total momentum of interacting bodies is always conserved.
The acceleration of a body is inversely proportional to its mass and directly proportional to the external force acting on the body.
17. The diagram below shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line.
What was the average velocity of the car during the third second?
15 m/sec
12 m/sec
9 m/sec
5 m/sec
2 m/sec
18. The average acceleration during the entire 3 second interval is closest to
27 m/sec
^{2}
9 m/sec
^{2}
6 m/sec
^{2}
5 m/sec
^{2}
3 m/sec
^{2}
19. A 50 kilogram skater at rest on a frictionless rink throws a 2 kilogram ball, giving the ball a velocity of 10.0 m/s. Which statement describes the skater's subsequent motion?
0.4 m/sec in the same direction as the ball.
0.4 m/sec in the opposite direction to the ball.
2 m/sec in the same direction as the ball.
4 m/sec in the same direction as the ball.
4 m/sec in the opposite direction to the ball
20. What is the shape of the velocity time graph for an object with the position time graph shown in the diagram below?
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