Physics Ch 3 Flashcards Preview

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Flashcards in Physics Ch 3 Deck (22)
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0
Q

Independence of motion

A

horizontal and vertical components of 2D motion are independent of each other

1
Q

Vector

A

quantities with both magnitude and direction

2
Q

Head to tail method

A

graphical way to add vectors

3
Q

tail

A

starting point of the vector

4
Q

head (tip)

A

final, pointed end of the arrow

5
Q

Resultant vector

A

vector sum of 2+ vectors

7
Q

magnitude of the resultant

A

length as measured by a ruler

8
Q

Direction of the resultant

A

measure the angle it makes with the reference frame using a protractor

9
Q

Commutative

A

characteristic of vector addition in that vectors can be added in any order and you’d still get the same result

10
Q

Multiply vector by positive scalar

A

magnitude changes, direction stays the same

11
Q

Multiply vector by negative scalar

A

magnitude changes, new vector in opposite direction

12
Q

Component

A

piece of a vector that points in either the vertical or the horizontal direction; every 2-d vector can be expressed as a sum of 2 vertical and horizontal vector ______(s)

13
Q

Analytical methods

A

vector addition and subtraction employs geometry and simple trigonometry rather than the ruler and protractor of graphical methods

14
Q

Projectile motion

A

motion of an object thrown or projected into the air, subject to only the acceleration of gravity

15
Q

Projectile

A

object that is thrown

16
Q

Trajectory

A

path a thrown object travels

17
Q

Air resistance

A

in two-dimensional projectile motion, this is negligible

18
Q

Range

A

horizontal distance R traveled by a projectile

19
Q

Velocity

A

object has this relative to a medium; medium has this relative to an observer on solid ground

20
Q

Relative velocities

A

velocity relative to some reference frame

21
Q

Relativity

A

study of how different observers moving relative to each other measure the same phenomenon

22
Q

Classical relativity

A

limited to situations where speeds are less than about 1% of the speed of light (less than 3000 km/s)

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