Chap 5 - Forces & Motion

Question 1

Kinematics

Answer 1

The branch of mechanics that deals with describing motion without consideration to forces.

Question 1

Dynamics

Answer 1

The branch of mechanics that deals with the effects of forces upon the motion of bodies.

Question 2

Mechanics

Answer 2

The branch of physics that encompasses both kinematics and dynamics.

Question 3

“the agent”

Answer 3

an object that applies a given force

Question 4

“the agent” for the force called “weight”

Answer 4

The Earth

(assuming you are on Earth)

Question 5

Long range force

Answer 5

A force that can act at a distance

(gravity, magnetic force, etc)

Question 6

contact force

Answer 6

a force that requires two object to touch.

Question 7

“Touch, Gravity, Friction”

Answer 7

The main three places we will look for forces.

Question 8

Net force

Answer 8

The sum of all the vector forces on an object.

Question 9

Net force is sometimes called the ___________ force

Answer 9

resultant

Question 10

Tension Force

Answer 10

The force applied by a stretched object.

Most commonly a string or a spring.

Question 11

In physics and math, “normal” means

Answer 11

“perpendicular to”

Question 12

Kinetic Friction

Answer 12

The force that retards the relative motion of two objects in contact.

Question 13

Static Friction

Answer 13

The force that keeps an object “stuck” and prevents relative motion between two surfaces.

Question 14

microscopic atomic model

Answer 14

a model of what is going on in a substance at the atomic level.

Question 15

Drag

Answer 15

The resistive force of a fluid.

(Drag is a type of friction)

Question 16

Thrust

Answer 16

A common force produced by a rocket or jet engine.

Question 17

A constant net force causes a

Answer 17

constant acceleration

Question 18

mass

Answer 18

the amount of matter an object contains

(The SI unit for mass is the kg)

Question 19

Answer 19

Question 20

The SI unit of force

Answer 20

“newtons”

Question 21

Interaction

Answer 21

When two objects have an effect upon each other

Question 22

Forces ALWAYS come in _______.

Answer 22

Pairs (always)

Question 23

An interaction will always include _______ forces.

Answer 23

Two

(forces come in pairs - ALWAYS)

Question 24

An object upon which all forces are balanced is in ________ _______.

Answer 24

Mechanical Equilibrium

Question 25

Static Equilibrium

Answer 25

An object in mechanical equilibrium that is also at rest.

Question 26

Dynamic Equilibrium

Answer 26

An object in mechanical equilibrium that is in motion

(must have constant velocity)

Question 27

An object needs __________ for why it remains at rest.

Answer 27

no explanation

Question 28

An object in motion needs ___________ for why it remains in motion.

Answer 28

no explanation

Question 29

An object that is accelerating needs ___________ for why it is acceleration

Answer 29

an explanation

(the explanation would be some sort of net force)

Question 30

An accelerating reference frame is also known as

Answer 30

a “non-inertial” reference frame.

Question 31

A frame of reference traveling at a constant velocity is known as

Answer 31

an “inertial reference frame.”

Question 32

In a non-inertail reference frame, Newton’s Laws ______________

Answer 32

DO NOT APPLY

Question 33

Every force has ____________.

Answer 33

An “agent”

Question 34

Free Body Diagram

Answer 34

A diagram that shows all the forces acting upon a single object.

Question 35

Answer 35

Question 36

Answer 36

Question 37

Mathematical statement of Newton’s Second Law

Answer 37