AnswersPhysicsTwo-Dimensional Motion and Gravity

Two-Dimensional Motion and Gravity — Test Answers

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1
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Which statement best compares the vectors?

A
The vectors have the same direction.
B
The vectors have the same displacement.
C
Vector X has greater magnitude than vector Y.
D
Vector Y has greater magnitude than vector X.
2
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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
3

Which conclusion is best supported by the image?

A
Earth is speeding up at W and slowing down at X because the force on Earth is greater at W than at X.
B
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.
C
The speed of Earth is greater at W than at X because the force on Earth is greater at W than at X.
D
Earth is slowing down at W and speeding up at X because the force on Earth is greater at W than at X.
4

A resultant vector is the [Dropdown 1] of two or more vectors.

Answer:

sum

5

The gravitational force between two objects is [Dropdown 1] proportional to the product of the masses of the objects.

Answer:

directly

6

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 toward the center of the circle.
B
It acts perpendicular to the velocity and is directed toward the center of the circle.
C
It acts parallel to the velocity and is directed away from the center of the circle.
D
It acts perpendicular to the velocity and is directed away from the center of the circle.
7

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
8

What is the direction of the centripetal force when applied to an object?

A
perpendicular to an object’s motion
B
the direction opposite to the object’s velocity
C
parallel with an object’s motion
D
the same direction as the object’s velocity
9

Kepler’s first law states that the orbits of planets are ellipses with the Sun at one [Dropdown 1] .

Answer:

focus

10

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

A
inertia
B
air resistance
C
centripetal force
D
gravity
11

Xavier throws a tennis ball to his friend Olaf at a 20 degrees angle relative to the ground with an initial velocity of 18 m/s The tennis ball travels 30 m until Olaf catches it. The time the tennis ball was in the air, rounded to the nearest hundredth, is [Blank 1] s

Answer:

1.77

12

Johannes Kepler is known for which discovery in astronomy?

A
proposing the heliocentric model of the solar system
B
recording 20 years of data about planetary motion
C
determining planetary laws of motion
D
discovering planets around other stars
13

Sung rolls a marble off the edge of a table. She rolls the marble off the same table again but at a different speed. Which best describes the projectile motion of the marble as it leaves the table at the two different speeds?

A
The marble’s horizontal velocity changes, but its vertical velocity does not.
B
The marble’s vertical velocity changes, but its horizontal velocity does not.
C
The marble’s horizontal and vertical velocities remain the same.
D
The marble’s horizontal and vertical velocities change.
14

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 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 .
C
The vertical velocity of projectile cap y is changing, and the horizontal velocity of projectile cap x is constant.
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 .
15

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
16

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 Earth
B
the orbital period of Earth with the orbital period of the moon
C
the orbital period of Earth with the rotational period of the moon
D
the orbital period of the moon with the rotational period of the moon
17

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

A
inertia
B
air resistance
C
friction
D
gravity
18

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 traveling too fast to match Earth’s curvature.
B
There is not enough friction to keep the object moving.
C
The object is not traveling fast enough to match Earth’s curvature.
D
There is not enough air resistance to keep the object moving.
19

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

A
the densities of the objects and their shapes
B
the masses of the objects and their densities
C
the distance between the objects and their shapes
D
the masses of the objects and the distance between them
20

The cycle of day and night is a result of Earth’s spinning on its axis, which is Earth’s [Dropdown 1] .

Answer:

rotation

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