(Stnd 03) Quiz-Kinematics WS

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

Two students are pushing a cart as shown in the following diagram. The cart will move as if it were acted upon by a single force.

Two-Part Question
Part One: Identify the magnitude and direction of acceleration that the cart will move
Part Two: Explain how this is connected to the crosscutting called stability and change.

a.	Part One: The cart will accelerate to the right with a magnitude of 50 N. Part Two: When balanced forces act on an object, its position is stable. When unbalanced forces act on an object, the position of the object changes.
b.	Part One: The cart will accelerate to the right with a magnitude of 150 N. Part Two: When unbalanced forces act on an object, its position is stable. When balanced forces act on an object, the position of the object changes.
c.	Part One: The cart will accelerate to the right with a magnitude of 350 N. Part Two: When balanced forces act on an object, its position is stable. When unbalanced forces act on an object, the position of the object changes.
d.	Part One: The cart will accelerate to the left with a magnitude of 550 N. Part Two: When balanced forces act on an object, its position is stable. When unbalanced forces act on an object, the position of the object changes.

A car traveling to the West begins to slow down as it approaches a traffic light.

Which statement concerning its acceleration in the West direction is correct?

a.	Both its accelerations and its velocity are positive.
b.	Its acceleration is positive but its velocity is negative
c.	Both its acceleration and its velocity are negative.
d.	Its acceleration is negative but its velocity is positive.

Examine the following information about an object in motion. Notice that to determine the object’s position we must measure the forces acting on the object, and we also must determine the direction that the object is moving.

Two-Part Question
Part One: Describe the motion of the free-falling object show above.
Part Two: What force changes would have to occurr to make this object hover?

a.	Part One: It is accelerating downward due to unbalanced forces acting on the object. Part Two: The forces above and below the object would have to be equal (balanced).
b.	Part One: The object is falling at a constant speed downward due to balanced forces. Part Two: The forces below the object must be increased by 200 N.
c.	Part One: The object is accelerating upward direction due to unbalanced forces. Part Two: The upward force must be decreased by 600 N to make this object hover.
d.	Part One: It is accelerating upward due to unbalanced forces acting on the object. Part Two: The downward force must be decreased by 400 N to make this object hover.

You throw a ball directly upwards to the ceiling. It travels up, slows down, reverses direction, and falls to the floor.
Which of the following statements about the ball’s motion must be true?

a.	The acceleration is smallest just before it hits the floor.
b.	After the ball leaves your hand, acceleration is constant until the ball hits the floor.
c.	The acceleration is the smallest as the ball approaches the ceiling.
d.	The accelerations increases as the ball approaches the ceiling.

Examine these free-body diagrams of a car in motion. Pay close attention to the forces acting upon the car.

Diagram 01	Diagram 02

Contrast the motion of the car in these two diagrams, and select the correct cause and effect description about the first diagram.

a.	In diagram 02 the car is stationary. In diagram 01 the car is moving forward. Diagram 01 Cause: greater forward force against lesser backward force. Diagram 01 Effect: The car is pulled forward.
b.	In diagram 01 the car is moving upwards. In diagram 02 the car is stationary. Diagram 01 Cause: greater upwards force against lesser downward force. Diagram 01 Effect: The car is pulled downward.
c.	In diagram 01 the car is moving backwards. In diagram 02 the car is stationary. Diagram 01 Cause: greater backwards force against lesser forward force. Diagram 01 Effect: The car is pulled rearward.
d.	In diagram 01 the car is stationary. In diagram 02 the car is moving forward. Diagram 01Cause: greater backwards force against lesser forward force. Diagram 01 Effect: The car is pulled rearward.

The graph below is about a car in Smyrna, Tennessee during 60-minute time period from 11 AM to 12 PM on a Thursday in December during lunch time.

Describe the motion of the car during this time period, and explain what must happen to change the car’s motion.

a.	The car is increasing in speed as it moves down a highway. Since the graph shows a straight (horizontal) line, the highway must be a straight road with no curves. To change the car’s motion, it would have to be acted upon by balanced forces.
b.	The car is stationary during this time. Since distance did not change and remained constant, the car must have stayed in the same spot. To change the car’s motion, it would have to be acted upon by unbalanced forces.
c.	The car is traveling at a constant speed. A straight line on a distance vs time graph reveals that the object’s speed remained the same. To change the car’s motion, it would have to be acted upon by unbalanced forces.
d.	A distance vs. time graph will not give the information needed to determine the motion of the card. A speed vs. time graph will be needed.

In 1969 astronauts first traveled to the Moon in the Saturn-5/Apollo spacecraft.
It was the most powerful rocket ship ever built, and it was a three-stage rocket.

Lunar Module	Saturn V-Apollo Spacecraft	Command Module

This rocket ship blasted off from the launch pad in Florida and was propelled with ever increasing speed upwards through the Earth’s atmosphere flying towards the Moon.
Which one of the following graphs best represent the motion of this rocket ship after it blasted off from the launch pad?

a.		c.
b.		d.

A basketball player shoots a free-throw. The motion of the basketball is shown below.

Describe the motion of the basketball after it leaves the player’s hands, and explain how this is an example of an acceleration change.

a.	The ball travels in a horizontal line to the basket with increasing speed. This is acceleration because of the change in velocity.
b.	The ball travels in curved trajectory in a single direction with decreasing speed. This is acceleration because of the change in velocity.
c.	The ball travels in curved trajectory in a single direction with decreasing speed. This is acceleration because of the change in direction.
d.	The ball moves downwards and then upwards in an arc. This is acceleration because of the change in force pulling the ball downwards.

Multiple Response
Identify one or more choices that best complete the statement or answer the question.

Free-body diagrams show the magnitude and direction of all forces acting on an object.

Multi-Select Question
Select the answer choices below that describe the motion of the object represented in the
Free Body Diagram above (Select 2 of 5 choices).

a.	The object will not have any acceleration up or down.
b.	The object will accelerate to the left
c.	The object will accelerate to the right
d.	The object will have upward motion.
e.	The object will have downward motion

10.

Multi-Select Question
Which of the following graphs represent objects demonstrating changes in position?
(Select 3 of 6 choices)