204 PHYSICS LAB FINAL |QUESTIONS & ANSWERS
VERIFIED SOLUTIONS 100%|GRADE A+|LATEST 2024/2025
1a) If the position of an object is zero at one instant, what is true about the velocity
of that object? (May be more than one.) - ✔✔the velocity could be negative, the
velocity could be positive, the velocity could be zero
1b) The slope of a position versus time graph gives - ✔✔Velocity
1c) The motions of a car and a truck along a straight road are represented by the
velocity-time graphs in the figure. The two vehicles are initially alongside each
other at time t = 0. At time T, what is true of the distances traveled by the vehicles
since time t = 0? - ✔✔The truck will have travelled further than the car
1d) Which of the following situations is impossible - ✔✔An object has constant
non-zero velocity and changing acceleration.
1e) The figure shows a color coded graph of the position x of a red car and a blue
car as a function of time t. According to this graph, which statements about these
cars must be true? (May be more than one.) - ✔✔-Both cars have the same
acceleration.
-The cars meet at time t = 10 s.
2a) A motorist wishes to travel 40 kilometers at an average speed of 40 km/hr.
During the first 20 kilometers, an average speed of 40 km/hr is maintained. During
the next 10 kilometers, however, the motorist goofs off and averages only 20
km/hr. To drive the last 10 kilometers and average 40 km/hr, the motorist must
drive - ✔✔faster than the speed of light
, 2b) Suppose that a car traveling to the west begins to slow down as it approaches a
traffic light. Which of the following statements about its acceleration is correct?
(May be more than one) - ✔✔-The acceleration is toward the east.
-Since the car is slowing down, its acceleration must be negative.
2c) The motion of an object is described in the velocity vs. time graph shown in the
figure. (-2.5 m/s to 3.5 m/s). Over the nine-second interval shown, we can say that
the speed of the particle - ✔✔decreases then increases
3a) In the figure, a 10-lb weight is suspended from two spring scales, each of
which has negligible weight. Which one of the following statements about the
readings in the scales is true? - ✔✔none are true (both scales should read 10 lbs)
3b) Bill and his daughter Susan are both standing on identical skateboards (with
really good frictionless ball bearings), initially at rest. Bill weighs three times as
much as Susan. Bill pushes horizontally on Susan's back, causing Susan to start
moving away from Bill. Just after Bill stops pushing, which of the following are
true? - ✔✔Susan and Bill are moving away from each other, and Susan's speed is
three times that of Bill.
3c) A crate is sliding down an inclined ramp at a constant velocity of 0.55 m/s. The
vector sum of all the forces acting on this crate must point - ✔✔none of the choices
are correct
3d) Suppose a particle is being accelerated through space by a 10-N force.
Suddenly the particle encounters a second force of 10 N in the opposite direction
from the first force. The particle, with both forces continuing to act on it -
✔✔Continues at the speed it had when it encountered the force
VERIFIED SOLUTIONS 100%|GRADE A+|LATEST 2024/2025
1a) If the position of an object is zero at one instant, what is true about the velocity
of that object? (May be more than one.) - ✔✔the velocity could be negative, the
velocity could be positive, the velocity could be zero
1b) The slope of a position versus time graph gives - ✔✔Velocity
1c) The motions of a car and a truck along a straight road are represented by the
velocity-time graphs in the figure. The two vehicles are initially alongside each
other at time t = 0. At time T, what is true of the distances traveled by the vehicles
since time t = 0? - ✔✔The truck will have travelled further than the car
1d) Which of the following situations is impossible - ✔✔An object has constant
non-zero velocity and changing acceleration.
1e) The figure shows a color coded graph of the position x of a red car and a blue
car as a function of time t. According to this graph, which statements about these
cars must be true? (May be more than one.) - ✔✔-Both cars have the same
acceleration.
-The cars meet at time t = 10 s.
2a) A motorist wishes to travel 40 kilometers at an average speed of 40 km/hr.
During the first 20 kilometers, an average speed of 40 km/hr is maintained. During
the next 10 kilometers, however, the motorist goofs off and averages only 20
km/hr. To drive the last 10 kilometers and average 40 km/hr, the motorist must
drive - ✔✔faster than the speed of light
, 2b) Suppose that a car traveling to the west begins to slow down as it approaches a
traffic light. Which of the following statements about its acceleration is correct?
(May be more than one) - ✔✔-The acceleration is toward the east.
-Since the car is slowing down, its acceleration must be negative.
2c) The motion of an object is described in the velocity vs. time graph shown in the
figure. (-2.5 m/s to 3.5 m/s). Over the nine-second interval shown, we can say that
the speed of the particle - ✔✔decreases then increases
3a) In the figure, a 10-lb weight is suspended from two spring scales, each of
which has negligible weight. Which one of the following statements about the
readings in the scales is true? - ✔✔none are true (both scales should read 10 lbs)
3b) Bill and his daughter Susan are both standing on identical skateboards (with
really good frictionless ball bearings), initially at rest. Bill weighs three times as
much as Susan. Bill pushes horizontally on Susan's back, causing Susan to start
moving away from Bill. Just after Bill stops pushing, which of the following are
true? - ✔✔Susan and Bill are moving away from each other, and Susan's speed is
three times that of Bill.
3c) A crate is sliding down an inclined ramp at a constant velocity of 0.55 m/s. The
vector sum of all the forces acting on this crate must point - ✔✔none of the choices
are correct
3d) Suppose a particle is being accelerated through space by a 10-N force.
Suddenly the particle encounters a second force of 10 N in the opposite direction
from the first force. The particle, with both forces continuing to act on it -
✔✔Continues at the speed it had when it encountered the force
