# Holt Physics: Motion in 2 dimensions Flashcards

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Holt Physics
Chapter 3
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1

Which of the following is a physical quantity that has a magnitude but no direction?
a. vector
b. scalar
c. resultant
d. frame of reference

b. scalar

2

Which of the following is a physical quantity that has both magnitude and direction?
a. vector
b. scalar
c. resultant
d. frame of reference

a. vector

3

Multiplying or dividing vectors by scalars results in
a. vectors
b. scalars
c. vectors if multiplied, scalars if divided
d. scalars if multiplied, vectors if divided

a. vectors

4

Which of the following is an example of projectile motion?
a. a jet lifting off a runway
b. a bullet fired from a gun
c. dropping an aluminum can into the recycling bin
d. a space shuttle orbiting earth

b. a bullet fired from a gun

5

What is the path of a projectile?
a. a wavy line
b. a parabola
c. a hyperbola
d. projectiles do not follow a predictable path

b. a parabola

6

Which of the following remains constant in projectile motion?
a. the vertical component of the velocity
b. the horizontal component of the velocity
c. the horizontal range
d. the vertical height.

b. the horizontal component of the velocity

7

Object A is projected horizontally at 10 m/s from the top of a building at the same moment that object B is dropped from the same point. If the ground below the building is level
a. object A will strike the ground first
b. object B will strike the ground first
c. both objects will strike the ground at the same
time
d. since the height of the building is not given
the correct answer cannot be determined.

c. both objects will strike the ground at the same time

8

At the peak of a projectiles path, which of the following is zero?
a. the acceleration of the projectile
b. the vertical velocity of the projectile
c. the horizontal velocity of the projectile
d. the displacement of the projectile

b. the vertical velocity of the projectile

9

As the projectile reaches the ground which of the following is zero?
a. the horizontal velocity of the projectile
b. the vertical velocity of the projectile
c. the horizontal acceleration of the projectile
d. the vertical acceleration of the projectile.

c. the horizontal acceleration of the projectile

10

Object A is projected horizontally with a speed v. Object B is projected horizontally with a speed 2v.
Which of the following statements is false.
a. both objects reach the ground at the same time
b. both objects will have the same vertical
velocity when they hit the ground
c. both objects will have the same horizontal
velocity when the hit the ground
d. both objects have the same acceleration

c. both objects will have the same horizontal velocity when they hit the ground

11

At the peak of a projectiles path
a. its net displacement is zero
b. its net acceleration is zero
c. its net velocity is zero
d. none of the above is true

d. none of the above is true

12

A baseball, after being struck by a batter, is traveling to the outfield. The acceleration of the baseball during its flight
a. is the same during the entire flight
b. depends on whether the ball is going up or
down
c. is greatest at the top of its trajectory
d. depends on how it was hit

a. is the same during the entire flight

13

A hunter shoots a duck that is flying horizontally at a height H. The time interval between hitting the duck and its impact with the ground depends on
a. how fast the bird was flying
b. how fast the bird was flying and the height H
c. the height H
d. the height H and on the distance between the
hunter and the duck when it was hit

c. the height H