Physics Test 11A
 
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Physics Test 11A

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

An airplane is flying at 635 km per hour at an altitude of 35,000 m. It is currently over Kansas and is approximately 16 minutes ahead of its scheduled arrival time. What is its velocity?
a.
635 km/h
b.
16 m/min
c.
35 000 m/s
d.
This cannot be determined without further information about its direction.
 

 2. 

The SI unit for speed is
a.
mph.
c.
m/s.
b.
ft/s2.
d.
Dv / t.
 

 3. 

On a speed-time graph, a line with a negative slope indicates that the object is
a.
speeding up.
c.
not moving.
b.
slowing down.
d.
traveling at a constant speed.
 

 4. 

The combination of all of the forces acting on an object is called the
a.
total force.
c.
super force.
b.
union of forces.
d.
net force.
 

 5. 

If the net force acting on a stationary object is zero, then the object will
a.
accelerate in the direction of the strongest force.
b.
remain at rest.
c.
begin moving backwards.
d.
decelerate at a steady rate of speed.
 

 6. 

If the net force on an object is zero then the object has
a.
reaction forces.
c.
balanced forces.
b.
action forces.
d.
unbalanced forces.
 

 7. 

A tug-of-war that results in one team pulling the other across the line is an example of
a.
action forces.
c.
balanced forces.
b.
reaction forces.
d.
unbalanced forces.
 

 8. 

Which of the following best illustrates balanced forces?
a.
a rock falling to the ground
b.
a stretched rubber band being held between two hands
c.
a person lifting a heavy box off of the ground
d.
a crash between a large truck and a train
 

 9. 

A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn?
a.
The mass of the object has increased.
b.
Gravity on the object has increased.
c.
The object is experiencing some kind of friction.
d.
The momentum of the object has reached a maximum.
 

 10. 

Which of the following statements is true?
a.
Frictional forces are greatest when both surfaces are rough.
b.
When a truck is parked on a hill, friction pulls the truck down the hill.
c.
Air resistance always opposes friction.
d.
Friction can exist between two objects even when they are not in contact.
 

 11. 

An object is in motion when
a.
you observe the object move.
b.
the object’s speed increases.
c.
the object’s displacement is greater than the distance traveled.
d.
the object changes position relative to a stationary reference point.
 

 12. 

Which straight-line acceleration indicates an increase in speed?
a.
0 m/s2
c.
4 m/s2
b.
-15 m/s2
d.
All of the above
 

 13. 

Which of the following speeds is the most accurate?
a.
100 miles per day
c.
100 miles per minute
b.
100 miles per hour
d.
100 miles per second
 

 14. 

How can the friction on a water slide be reduced?
a.
warm the surface of the slide
b.
keep the surface of the slide dry
c.
run a constant stream of water down the slide
d.
increase the slope of the slide
 

 15. 

Which is an example of balanced forces acting on an object?
a.
a kangaroo jumping
c.
a cyclist slowing down
b.
a car turning a corner
d.
a leaf lying on the grass
 

 16. 

A car is parked on a hill. In order to keep the car from rolling downhill, how great must the static friction acting on the car be?
a.
equal to the force pulling the car downhill
b.
greater than the force pulling the car downhill
c.
greater than the force pulling the car uphill
d.
smaller than the force pulling the car uphill
 

 17. 

An object that changes position relative to a reference point is
a.
stationary.
c.
moving at constant speed.
b.
in motion.
d.
moving at constant velocity.
 

 18. 

Average speed can be represented by the mathematical expression
a.
distance/time.
c.
timedistance.
b.
distance ´ time.
d.
time + distance.
 

 19. 

The _____ of an object consists of its speed and direction.
a.
velocity
c.
average speed
b.
instantaneous speed
d.
displacement
 

 20. 

The average speed of a runner who runs 500.0 m in 1.6 min is
a.
0.19 m/s.
c.
96 m/s.
b.
5.2 m/s.
d.
312 m/s.
 

 21. 

A car moving at an average speed of 55.0 mi/h for 4.25 h has traveled
a.
0.08 mi.
c.
55 mi.
b.
13 mi.
d.
234 mi.
 

 22. 

On a distance vs. time graph of an object’s motion, distance is usually
a.
plotted on the x-axis.
c.
the dependent variable.
b.
greater than time.
d.
measured in ft/min.
 

 23. 

A pitcher throws a baseball to home plate, a distance of 60.5 ft. The ball reaches home plate in 0.63 s. What is the velocity of the ball?
a.
38 ft/s
c.
96 ft/s
b.
38 ft/s toward home plate
d.
96 ft/s toward home plate
 

 24. 

When the motion of an object is shown by a straight line on a distance vs. time graph with distance on the y-axis, the slope of the line is the
a.
distance traveled.
c.
speed.
b.
displacement.
d.
time of travel.
 

 25. 

On a bus traveling north at 20.0 m/s, a child stands up and walks toward the back of the bus at 1.3 m/s. What is the child’s resultant velocity?
a.
18.7 m/s north
c.
21.3 m/s north
b.
18.7 m/s south
d.
21.3 m/s south
 

 26. 

Displacement must always indicate
a.
velocity.
c.
speed.
b.
direction.
d.
time.
 

 27. 

Speeding up, slowing down, and changing direction is best described as
a.
velocity.
c.
displacement.
b.
distance.
d.
acceleration.
 

 28. 

When centripetal acceleration occurs, an object
a.
speeds up.
c.
changes direction.
b.
slows down.
d.
is stationary.
 

 29. 

The equation for finding average acceleration for straight-line motion is
a.
initial velocity – final velocity ´ time.
b.
final velocity – initial velocity/time.
c.
initial velocity + final velocity + time.
d.
initial velocity + final velocity – time.
 

 30. 

Moving from 0 m/s to 25 m/s in 8.0 s equals an average acceleration of
a.
0.32 m/s.
c.
3.1 m/s.
b.
0.32 m/s2.
d.
3.1 m/s2.
 

 31. 

A cyclist is traveling at an initial speed of 10.0 m/s. She accelerates at a rate of 0.500 m/s2. What is her final speed after 9.0 s?
a.
14.5 m/s
c.
5.5 m/s
b.
14.5 m/s2
d.
5.5 m/s2
 

 32. 

Peter runs in a constant direction on a straight road. The velocity vs. time graph of Peter’s motion shows a straight line with a negative slope. What does the line tell you about Peter’s speed?
a.
It is increasing.
c.
It is decreasing, then increasing.
b.
It is decreasing.
d.
It is constant.
 

 33. 

When velocity changes by the same amount over each time interval, acceleration is
a.
zero.
c.
positive.
b.
constant.
d.
negative.
 

 34. 

On a velocity vs. time graph, what shows the value of the acceleration?
a.
the slope of the line
c.
the y-axis
b.
the x-axis
d.
the final velocity
 

 35. 

A cheetah can accelerate at up to 6.0 m/s2. How long does it take for a cheetah to speed up from 10.5 m/s to 12.2 m/s?
a.
0.28 s
c.
3.5 s
b.
1.7 s
d.
10 s
 

 36. 

What happens when a car slows down and velocity changes?
a.
positive acceleration
c.
negative acceleration
b.
resultant acceleration
d.
constant acceleration
 

 37. 

Net force is
a.
the force acting in the same direction as an object’s movement.
b.
the force acting in the opposite direction of an object’s movement.
c.
the combination of all the forces acting on an object.
d.
the force of gravity pulling an object down.
 

 38. 

An object experiencing balanced forces
a.
has a net force of zero.
c.
is slowing down.
b.
is speeding up.
d.
stops moving.
 

 39. 

A game of tug-of-war is an example of
a.
rolling friction.
c.
streamlining.
b.
air resistance.
d.
unbalanced forces.
 

 40. 

Which is an example of static friction?
a.
pulling a skier behind a boat
c.
braking a car going down a hill
b.
pushing a box that is at rest
d.
driving a car up a hill
 



 
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