AnswersPhysicsTwo-Dimensional Motion

Two-Dimensional Motion — Test Answers

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1
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Based on the map, at which point is the object accelerating toward the right?

A
W
B
X
C
Y
D
Z
2
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Which conclusion is best supported by the image?

A
The speed of Earth is greater at W than at X because the force on Earth is greater at W than at X.
B
Earth is slowing down at W and speeding up at X because the force on Earth is greater at W than at X.
C
The speed of Earth is the same at W as at X because the force on Earth is the same at W as at X.
D
Earth is speeding up at W and slowing down at X because the force on Earth is greater at W than at X.
3

Projectile motion is a combination of which two types of motion?

A
straight and diagonal
B
constant and linear
C
horizontal and vertical
D
parabolic and curved
4

A group of scientists is trying to launch an object into orbit, and the object is traveling at 6500 m/s Which best explains why the object will not successfully orbit Earth?

A
The object is not traveling fast enough to match Earth’s curvature.
B
There is not enough air resistance to keep the object moving.
C
There is not enough friction to keep the object moving.
D
The object is traveling too fast to match Earth’s curvature.
6

The gravitational force between two objects is 2400 N. What will be the gravitational force between the objects if the mass of one object is doubled?

A
4800 N
B
1200 N
C
9600 N
D
600 N
7

Hakeem wants to explain why only one side of the moon is visible from Earth. Which comparison would provide the best support?

A
the orbital period of the moon with the rotational period of the moon
B
the orbital period of Earth with the orbital period of the moon
C
the orbital period of the moon with the rotational period of the Earth
D
the orbital period of Earth with the rotational period of the moon
8

Quinn is testing the motion of two projectiles x and y by shooting them from a sling shot. What can we say best describes the motion of the projectiles ? Assume air resistance is not a factor

A
The horizontal velocity of projectile cap x is changing, and the vertical velocity of projectile cap y is constant.
B
The vertical velocity of projectile cap y is changing, and the horizontal velocity of projectile cap x is constant.
C
The horizontal acceleration of projectile cap y is negative 9 point 8 m/s squared , and the vertical acceleration of projectile cap y is 0 m/s squared .
D
The horizontal acceleration of projectile cap x is negative 9 point 8 m/s squared , and the vertical acceleration of projectile cap y is 0 m/s squared .
9

What must be true of a force that causes an object to move in a circular motion?

A
It acts parallel to the velocity and is directed away from the center of the circle.
B
It acts parallel to the velocity and is directed toward the center of the circle.
C
It acts perpendicular to the velocity and is directed away from the center of the circle.
D
It acts perpendicular to the velocity and is directed toward the center of the circle.
10

Question text not available

Answer:

revolution

11

Question text not available

Answer:

inversely

13

Jin walked 4 kilometers on a straight path to get to the sandwich shop. He traveled 30 degrees south of east. What is the southern component of Jin’s displacement, rounded to the nearest tenth?

A
2 kilometers
B
3 point 5 kilometers
C
negative 2 kilometers
D
negative 3 point 5 kilometers
14

What is the only force acting on an object orbiting Earth?

A
air resistance
B
gravity
C
inertia
D
friction
15

How does a centripetal force cause circular motion?

A
It acts in the direction of the object’s motion and causes the object to constantly change direction.
B
It acts at a right angle to the object’s motion and causes the object to constantly change speed.
C
It acts at a right angle to the object’s motion and causes the object to constantly change direction.
D
It acts in the direction of the object’s motion and causes the object to constantly change speed.
16

The universal law of gravitation states that the force of attraction between two objects depends on which quantities?

A
the masses of the objects and their densities
B
the densities of the objects and their shapes
C
the distance between the objects and their shapes
D
the masses of the objects and the distance between them
17

Johannes Kepler is known for which discovery in astronomy?

A
determining planetary laws of motion
B
recording 20 years of data about planetary motion
C
discovering planets around other stars
D
proposing the heliocentric model of the solar system
18

Which equation represents the Pythagorean theorem, which can be used to find the magnitude of resultant vectors?

A
cap r squared is equal to cap A squared plus cap b squared
B
cap r is equal to cap A plus cap b
C
cap r squared is equal to cap A squared times cap b squared
D
cap r is equal to cap A times cap b
19

Question text not available

Answer:

area

20

Question text not available

Answer:

rotation

21

The orbital period of a satellite is 2 times 10 to the 6th power s and its total radius is 2 point 5 times 10 to the 12th power m

Answer:

7.85e6

22

Once an object enters orbit, what keeps the object moving sideways?

A
air resistance
B
gravity
C
inertia
D
centripetal force

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