physics rev 1 - pt 1

Question 1

Connection between force and motion.

The study of forces and their effects on motion of moving objects

Answer 1

dynamics

Question 2

Any kind of “push or pull”.

An action capable of accelerating an object

A vector quantity (has both magnitude and direction).

Answer 2

force

Question 3

Force exerted when one object comes in contact with another object.

Answer 3

Contact forces

Question 3

Causes object to fall (gravity is
not a contact force).

Answer 3

Force of gravity

Question 4

Vector sum of all forces acting on the object.

Answer 4

Net force

Question 5

true or false

Force is always required to accelerate an object

Answer 5

true

Question 6

Force of gravity acting on the object.

o ____- is different from mass

o Magnitude of the force of gravity on an
object

Answer 6

weight

Question 6

“Every object continues in its state of rest, or uniform velocity in a straight line, as long as no net force acts on it”

Answer 6

FIRST LAW OF MOTION: INERTIA

Question 6

Weight of a given mass will be different
on the moon or other planets

true or false

Answer 6

true

Question 6

More mass an object = greater the force needed to give it a particular acceleration

true or false

Answer 6

true

Question 7

o “Quantity of matter”
o “Measure of the inertia of an object “

Answer 7

Mass

Question 7

An object of higher mass will have a greater
tendency to resist change thus having a greater ____.

Answer 7

inertia

Question 7

• Also known as Law of Force and Acceleration

A net force causes acceleration.

Answer 7

SECOND LAW OF MOTION: ACCELERATION

Question 8

:
o “Tendency of an object to maintain its state of rest in uniform velocity in a straight line.”

Answer 8

Inertia

Question 9

______ of an object is directly proportional to
the net force acting on it.

Answer 9

Acceleration

Question 10

Acceleration of an object is ______ proportional to the object’s mass.

Answer 10

inversely

Question 10

Direction of the acceleration is in the direction of the net force acting on the object.

true or false

Answer 10

true

Question 11

“To every action there is an equal and opposite reaction.”

Answer 11

THIRD LAW OF MOTION: INTERACTION

Question 11

• “Whenever one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first”

Answer 11

THIRD LAW OF MOTION: INTERACTION

Question 12

• Acts on an object when it is falling.
• Gravitational force does not disappear when we are at rest on Earth.

Answer 12

force of gravity

Question 13

• Occurs when contact force acts perpendicular to the common surface of contact

Answer 13

NORMAL FORCE

Question 14

t or f

• Normal force is elastic in origin –

Answer 14

t

Question 15

t or f

• Normal force is always equal to the weight

Answer 15

f

• Normal force is not always equal to the weight

Question 16

t or f

Normal force is not necessarily vertical

Answer 16

true

Question 17

true or false Weight and normal force are action- reaction pairs

Answer 17

false Weight and normal force are not action- reaction pairs

Question 18

* Study of motion. * Two divisions: kinematics and dynamics

Answer 18

mechanics

Question 19

o Study of how objects move.

Answer 19

Kinematics

Question 19

o A quantity that is defined by both a magnitude and a direction.

Answer 19

Vector Quantity

Question 20

o Deals with force and why objects move as they do.

Answer 20

Dynamics

Question 20

o A quantity that is solely dependent on magnitude (numerical value).

Answer 20

Scalar Quantity

Question 21

o Change in position of the object. o Scalar quantity (magnitude only)

Answer 21

Distance

Question 22

o How far the object is from its starting point. o Vector quantity (has both magnitude and direction)

Answer 22

Displacement

Question 23

o Any measurement of position, distance, or speed must be made with respect to a reference frame using coordinate axes

Answer 23

Reference Frames and Displacement

Question 24

o position of an object at any moment

Answer 24

X- axis:

Question 25

o Total distance traveled along its path divided by the time it takes to travel this distance.

Answer 25

Average Speed

Question 25

vertical motion as for a dropped object

Answer 25

Y-axis

Question 26

o How far an object travels in a given time interval, regardless of direction. o Scalar quantity

Answer 26

Speed

Question 27

o Signifies both the magnitude (numerical value) of how fast an object is moving as well as the direction in which it is moving.

Answer 27

Velocity

Question 28

o Defined in terms of displacement, rather than total distance traveled o Displacement divided by time elapsed or time interval

Answer 28

Average Velocity

Question 29

Average velocity over an infinitesimally short time interval

Answer 29

Instantaneous Velocity

Question 30

o An object that is slowing down is decelerating o Velocity and acceleration point in opposite directions when there is deceleration (dropping velocity)

Answer 30

Deceleration

Question 31

o Any object whose velocity is changing is said to be accelerating. o “Change in velocity”

Answer 31

acceleration

Question 32

o Rate in which an object slows down o Deceleration does not mean negative acceleration.

Answer 32

Deceleration

Question 33

* Falling objects increase in speed as they fall. * “At a given location on the Earth and in the absence of air resistance, all objects fall with the same constant acceleration”

Answer 33

FREE FALLING OBJECTS

Question 33

o Object following a projectile motion.

Answer 33

Projectile

Question 34

o Path that a projectile motion follows

Answer 34

Trajectory

Question 35

o Motion present in objects that move without rotating

Answer 35

Translational Motion

Question 36

o Defined as motion in a circle at constant speed

Answer 36

Uniform Circular Motion

Question 37

o Change in velocity per unit time towards the center of a circle

Answer 37

Centripetal Acceleration

Question 38

o Force that causes an object to move in a circle at a constant speed

Answer 38

Centripetal Force