Chapter 4: Newton's Second Law of Motion (from Lecture Slides)

Question 1

Force causes

Answer 1

Acceleration

Question 2

Acceleration is

Answer 2

Directly proportional to net force

Question 3

To increase the acceleration of an object,

Answer 3

Increase the net force acting on it

Question 4

Directly proportional (Symbol)

Answer 4

x = y

Question 5

Inversely proportional (Symbol)

Answer 5

x = 1/y

Question 6

Friction decreases the

Answer 6

Net force and the acceleration

Question 7

Friction depends on

Answer 7

The kind of materials and how much they are pressed together

Question 8

Friction is due to

Answer 8

Tiny surface bumps and to “stickiness” of the atoms on a material’s surface

Question 9

Friction between a crate on a smooth wooden floor is

Answer 9

Less than that on a rough floor

Question 10

Friction opposes

Answer 10

Direction of motion

Question 11

Object moves at

Answer 11

Constant velocity and no acceleration

Question 12

Friction force is

Answer 12

Equal and opposite to the applied force

Question 13

When object at rest, no friction unless

Answer 13

You apply a force and it does not move

Question 14

Inertia depends on

Answer 14

The amount of matter that makes up an object

Question 15

More matter equal to

Answer 15

More inertia

Question 16

Mass

Answer 16

The quantity of matter in an object and it is also the measure of the inertia or sluggishness that an object exhibits in response to any effort made to start it, stop it, or change its state of motion in anyway

Question 17

Weight usually the force upon an object due to

Answer 17

Gravity

Question 18

Near Earth’s surface, mass proportional to

Answer 18

Weight

Question 19

The weight of an object of mass m due to

Answer 19

Gravity equals to mg

Question 20

Weight equal to

Answer 20

Mass x Acceleration due to gravity

Question 21

Weight units of

Answer 21

kg x m/s^2 equals to N

Question 22

W and Fg

Answer 22

mg

Question 23

Mass and weight in everyday conversation are

Answer 23

Interchangeable

Question 24

Mass, however, is different and more

Answer 24

Fundamental than weight

Question 25

On the Moon and Earth, weight of an object on the Moon is

Answer 25

Less than on Earth

Question 26

Mass of an object is the

Answer 26

Same in both locations

Question 27

If the mass of an object is halved, the weight of the object is

Answer 27

Halved

Question 28

One kg weighs

Answer 28

9.8 newtons on Earth’s surface

Question 29

Relationship between kilograms and pounds are

Answer 29

1kg = 2.2 lb at Earth’s surface and 1lb equal to 4.45 N

Question 30

Mass resist

Answer 30

Acceleration

Question 31

Acceleration depends not only on

Answer 31

The force but also on the mass being pushed

Question 32

The same force applied to

Answer 32

1) Double the mass produces half the acceleration
2) Tripling the mass, produces 1/3 the acceleration

Question 33

For a given force, the acceleration produced is

Answer 33

Inversely proportional to the mass (Acceleration proportional to 1/mass)

Question 34

Newton’s Second Law of Motion

Answer 34

Relates acceleration, force, and mass

Question 35

The acceleration produced by a

Answer 35

Net force on an object is directly proportional to the net force is in the same direction as the net force, and is inversely proportional to the mass of the object

Question 36

If net force acting on object is

Answer 36

Doubled, and the object’s acceleration will be doubled

Question 37

If mass of object is doubled, the object’s acceleration will be

Answer 37

Halved

Question 38

When acceleration is g-Free fall: The greater the mass of the object

Answer 38

1) The greater its force of attraction toward the Earth
2) The smaller its tendency to move, that is, the greater its inertia

Question 39

Acceleration of both sets of bricks is

Answer 39

The same (Twice the force on twice the mass gives the same acceleration g)

Question 40

Acceleration of free fall is

Answer 40

Independent of an object’s mass

Question 41

Non-free fall

Answer 41

Object falling under the influence of air resistance

Question 42

When an object falls downward through the air it experiences

Answer 42

1) Force of gravity pulling it downward
2) Air drag force acting upward
3) R depends on frontal surface area and speed

Question 43

Drag force (R) slows down

Answer 43

The falling (a < g)

Question 44

Terminal speed occurs when

Answer 44

Acceleration terminates (when air resistance equals to weight and net force is zero)

Question 45

Terminal velocity same as

Answer 45

Terminal speed with direction implied or specified

Question 46

At the point where the air resistance force on you

Answer 46

Equals your weight, the net force on you will be zero, so you will stop accelerating and fall with constant velocity your terminal velocity

Question 47

As an object falls in air

Answer 47

1) Its speed increases
2) The air resistance force on it increases
3) The net force on it decreases
4) Its acceleration decreases until it reaches terminal velocity, where the net force on it and its acceleration are zero

Question 48

A skydiver in fall after jumping from a plane, weight and air resistance acts on

Answer 48

The falling object

Question 49

As falling speed increases, air resistance on diver

Answer 49

Build up, net force is reduced and acceleration becomes less

Question 50

When air resistance equals the diver’s

Answer 50

Weight, net force is zero, and acceleration terminates

Question 51

Diver reach terminal velocity, then continues

Answer 51

The fall at constant speed