Test 1

Question 1

Kinematics

Answer 1

Deals with concepts needed to describe motion

Question 2

Dynamics

Answer 2

deals with the effect those forces have on motion

Question 3

Together, kinematics and dynamics are

Answer 3

Mechanics

Question 4

Average speed

Answer 4

is the distance traveled divided by the time required to cover the distance.

Question 5

Average Velocity

Answer 5

Displacement/elapsed time

Question 6

Instantaneous velocity

Answer 6

indicates how fast the car moves and the direction of motion at each instant of time.

Question 7

When I flip a coin in the air, what happens to the velocity and acceleration?

Answer 7

Velocity at the top equals 0 m/s.

The acceleration is not changed

Question 8

Which one of the following statements concerning the displacement of an
object is false?

a) Displacement is a vector quantity that
points from the initial position of an object
to its final position.
b) The magnitude of an object’s displacement is always equal to the distance it
traveled from its initial position to its final position.
c) The magnitude of an object’s displacement is the shortest distance from its initial
position to its final position.
d) The direction of an object’s displacement is indicated by an arrow that begins on
the initial position of the object and ends on its final position.
e) The length of the arrow representing an
object’s displacement is proportional to
its magnitude.

Answer 8

B) the magnitude of an object’s displacement is always equal to the distance it traveled from its initial position to its final position

Question 9

Which one of the following quantities is an object’s
displacement divided by the elapsed time of the displacement?
a) average velocity
b) instantaneous velocity
c) average displacement
d) average acceleration
e) instantaneous acceleration

Answer 9

A) average velocity

Question 10

A truck drives due south for 1.8 km in 2.0 minutes. Then, the
truck turns and drives due west for 1.8 km in 2.0 minutes. Which
one of the following statements is correct?
a) The average speed for the two segments is the same. The average velocity for the two segments is the same.
b) The average speed for the two segments is not the same. The
average velocity for the two segments is the same.
c) The average speed for the two segments is the same. The average
velocity for the two segments is not the same.
d) The average speed for the two segments is not the same. The
average velocity for the two segments is not the same.

Answer 10

C) speed is the same, velocity is not

Question 11

In two-dimensional motion in the x-y plane, what is the relationship
between the x part of the motion to the y
part of the motion?
a) The x part of the motion is independent of the y part of the motion.
b) The y part of the motion goes as the square of the x part of the motion.
c) The x part of the motion is linearly dependent on the y
part of the motion.
d) The x part of the motion goes as the square of the y part of the motion.
e) If the y part of the motion is in the vertical direction, then
x part of the motion is dependent on the y part.

Answer 11

A) x part of the motion is independent of the y part of the motion

Question 12

Driving in a car at a constant velocity and you shoot a bullet in the air. Where would the bullet land?

Answer 12

In the barrel of the gun

Question 13

Force

Answer 13

push or a pull

Question 14

Contact forces

Answer 14

arise from physical contact

Question 15

Action at distance forces

Answer 15

do
not require contact and include
gravity and electrical forces.

Question 16

Mass

Answer 16

Amount of “stuff” in an object

quantitative measure of inertia

Question 17

Newton’s first law

Answer 17

1. The object tends to stay in a same state (either at rest or
   constant speed motion)
2. But a net force can change this situation

Question 18

Net force

Answer 18

vector sum of all forces acting on an object

Question 19

Inertia

Answer 19

s the natural tendency of an
object to remain at rest or in motion at a
constant speed along a straight line.

Question 20

A reference frame in which newton’s first law of motion is valid is called

Answer 20

inertial reference frame

Question 21

All accelerating reference frames are

Answer 21

noninertial

Question 22

Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line?

a) velocity
b) equilibrium
c) acceleration
d) inertia
e) force

Answer 22

d) inertia

Question 23

Complete the following statement: An inertial reference frame is one in which

a) the frame is accelerating.
b) Newton’s first law of motion is valid.
c) the acceleration due to gravity is greater than zero m/s^2
d) Newton’s third law of motion is not valid.
e) the inertias of objects within the frame are zero.

Answer 23

B) newton’s first law of motion is valid

Question 24

Complete the following statement: The net force that results when two
or more forces act on an object is
a) determined by adding the magnitudes of the individual forces. The
direction of the net force is the same as the direction of motion.
b) the largest force acting on the object.
c) determined using vector addition of the individual forces acting on the object.
d) the magnitude of the largest force acting on the object. The direction of the net force is the same as the direction of motion.

Answer 24

C) determined using vector addition of the individual forces acting on the object

Question 25

Newton's 2nd Law

Answer 25

When a net external force acts on an object of mass m, the acceleration that results is directly proportional to the net force and has a magnitude that is inversely proportional to the mass. The direction of the acceleration is the same as the direction of the net force.

Question 26

SI unit for Force | 1 N=

Answer 26

(kg x m)/s^2

Question 27

Complete the following statement: The term net force most accurately describes a) the inertia of an object. b) the quantity that causes displacement. c) the quantity that keeps an object moving. d) the mass of an object. e) the quantity that changes the velocity of an object.

Answer 27

e) quantity that changes velocity of an object

Question 28

Free body diagram

Answer 28

a diagram that represents the object and the forces that act on it.

Question 29

An object moves in the eastward direction at constant speed. A net force directed northward acts on the object for 5.0 s. At the end of the 5.0-second period, the net force drops to zero newtons. Which one of the following statements is necessarily true? a) The final velocity of the object will be directed north of east. b) The object will be moving eastward when the force drops to zero newtons. c) The direction of the object's acceleration depends on how fast the object was initially moving. d) The change in the velocity of the object will be directed north of west. e) The magnitude of the object's acceleration depends on how fast the object was initially moving.

Answer 29

A) the final velocity of the object will be directed north of east

Question 30

Newton's third law

Answer 30

Whenever one body exerts a force on a second body, the second body exerts an oppositely directed force of equal magnitude on the first body.

Question 31

Fundamental

Answer 31

1. Gravitational force 2. Strong Nuclear force 3. Electroweak force

Question 32

Nonfundamental

Answer 32

1. friction 2. tension in a rope 3. normal or support forces

Question 33

Which one of the following statements is true according to Newton’s third law of motion? a) The vector sum of all forces acting on an object is zero. b) A force on an object produces an equal in magnitude, but oppositely directed force on another object. c) A force on an object produces another equal in magnitude, but oppositely directed force on the object. d) A force on an object produces another differing in magnitude, but oppositely directed force on the object. e) A force on an object produces another differing in magnitude, but oppositely directed force on another object.

Answer 33

b) A force on an object produces an equal in magnitude, but oppositely directed force on another object.

Question 34

Consider the following forces: (1) frictional, (2)gravitational, (3) tension, (4) strong nuclear, (5) normal, and (6) electroweak. Which of the forces listed are considered fundamental forces? a) 1, 2, and 4 b) 1, 3, and 5 c) 1, 2, 3, and 5 d) 2, 4, and 6 e) 2, 3, 4, and 6

Answer 34

d) 2, 4, and 6

Question 35

Newton's law of universal gravitation

Answer 35

Every particle in the universe exerts an attractive force on every other particle.  A particle is a piece of matter, small enough in size to be regarded as a mathematical point.  The force that each exerts on the other is directed along the line joining the particles.

Question 36

Normal Force

Answer 36

surface, in contact, perpendicular to surface

Question 37

Friction

Answer 37

Surface, contact, parallel

Question 38

Static

Answer 38

2 surfaces in contact, but tendency to move

Question 39

kinetic force

Answer 39

2 surfaces in contact, but they actually move

Question 40

Equilibrium

Answer 40

what an object's acceleration is zero