EXTRA: Physics TB/Group Probs/etc

Does velocity change the intercept or the slope of the pos-time graph?

if slope changes, velocity changes the intercept has no relation with change in velocity

What type of info can be obtained from the position time equation of motion?

it gives the position of x at any time

si unit of speed

meters per second m/s

What does a straight line on a position time graph represent?

motion with CONSTANT velocity

Can the position-time graph be a vert line?

no a vert line on this graph would mean a very large distance covered in a very small time period which isnt possible w a possibility of an obj moving at a infinite speed

IS it possible for two diff objects to have the same velocity but diff speeds?

no because if two obj have same velocity they should have same speed and same direction of mvmt

Two things average velocity tells us:

on average how fast something is moving and the avg direction in which the object is moving

Plotting the position data on the y axis and the time data on x axis creates a _________ of the motion

position-time graph

An objects position time graph is a straight line with a positive slope. Is the velocity of this object positive, neg, or zero?

positive

Like distance, average speed is always

positive?

What does the slope of a position time graph tell you about the motion of an object?

slope in a position-time graph equals rise over run or change in position over the change in time

A straight line on a position-time graph represents motion w constant velocity. What does the slope of the line represent? What does the y int of the line represent?

slope represents velocity and y represents initial position

whats the rate of motion?

speed

Main diff betw velocity and speed?

speed only focuses on the distance covered and velocity focuses on the rate of motion and direction

What does the intersection of the graphs of two equations of motion for two diff objects represents?

the time at which the objects are at the same location

What is the same everywhere on a straight line?

velocity

Diff betw velocity and speed

velocity gives rate of motion and its direction speed only gives rate of motion

An objects position time graph is a straight line with a negative slope. Is the velocity of this object positive, neg, or zero?

velocity is negative but speed is positive

What physical quantities are measured along the axes of a position-time graph?

vertical axis takes position and horizontal axis takes time in a position-time graph

Why does a horizontal line show up on a position-time graph?

when the position does not change over time

Months to seconds

x by 2.628e+6

The equation of motion for a float in a parade is x=-9.2m +(1.5 m/s)t. at what time is the float at x=0?

xf-xi/v =t 0-(-9.2)m/1.5m/s 6.1s

The position of an object at any time is described by the equation of motion:

xf=xi+vt

Is it possible for two obj to have the same velocity but diff initial positions?

yes as an objs velocity is completely distinct from its initial position the objs to have the same velocity only requirement is that they move w the same speed and travel in same direction

Can the position-time graph for the motion of an object be a horiz line?

yes if an obj is at rest

Is it possible for two different objects to have the same initial positions but different velocities?

yes two obj can have two diff velocities while having same starting position as an obj velocity is completely distinct from its initial position

If the avg velocity of your dog on its daily walk is zero, is its displacement positive, negative, or zero?

zero

Slope of horizontal line Velocity of horizontal line

zero slope 0 avg velocity

Example of a coordinate system in one dimension?

An x-axis with an origin at the point where x is equal to zero (x=0) and an arrow indicating the positive direction.

Can the position-time graph for the motion of an object be a horizontal line? Can the position-time graph be a vertical line? Explain your answer for each case?

Can be HL if the object isn't moving or isn't changing position. CAN'T be a VL because that would mean the object is in more than one position at a time and that isn't possible.

Any time an object is in motion, it's position is

Changing

Can you take a bike ride in such a way that the distance you cover is less than the magnitude of your displacement?

Distance traveled cannot be less than its displacement so the answer is no. if you ride a bike in a straight line your displacement and distance traveled are equal but any deviation from straight line travel will result in a distance traveled that is greater than the displacement

Slope of a position-time graphs corresponds to

constant velocity

Average velocity definition

defined as its displacement per unit of time av=displ/time

Average speed definition

defined as its speed averaged over a given period of time

average speed and avg velocity define

defined as its speed averaged over a given period of time defined as its displacement per unit of time

Who has the greater avg velocity, an astronaut who has just completed an orbit of the earth or you when you have just traveled from home to school?

displ of astro will be 0 I will have some distance come home frome school avg vel is found by dividing displ by time so I have greater avg velocity

the change in its position

displacement of an object

Total length of the path taken on a trip

distance

General definitions of distance and displacement

distance is total length traveled displacement is the net change in position

Is the distance on a round-trip positive, negative, or zero? Is the displacement on a round-trip positive, negative, or zero?

distance traveled will always be positive for the entire trip, either round trip or one way The displacement for a round-trip will always be zero because the initial and final positions are the same

Who has the greater displacement, an astronaut that completed an orbit around earth or you when you have just traveled from home to school?

I have greater displacement. the displac of astro will be zero becasue he ended his journey right where he started.

Displacement is a vector. Why?

It has both a magnitude and a direction It's direction is given by its sign

The equation of motion for a person riding a bicycle is x=6.0 m + (4.5m/s)t A.) where is the bike at t=2.0s B.) at what time is the bike at the location x=24 m?

Just plug it all in!!! X=6.0m+4.5m/s(2.0s) S's cancel and you have x=15.0m 24m=6.0m+(4.5m/s)t t=4 sec

Displacement and distance have the same si unit:

Meter

SI unit of distance

Meter (m)

Si unit of displacement

Meter (m)

Distance is always positive even if the trip was in the ________ ___________

Negative direction

Distance has _____ direction Distance is always _______

Noooo Positive

Object 1 starts at 5.4 m and moves with a velocity of 1.3 m/s. Object 2 starts at 8.1 m and moves with a velocity of -2.2 m/s. The two objects are moving directly toward one another. A.) at what time do the objects collide? B.) what is the position of the objects when they collide?

REMEMBER THIS: xf=xi+vt xf= 5.4m+(1.3m/s)t xf=8.1m+(-2.2m/s)t Either set these two equations equal to each other or do first initial minus second initial over first velocity over second velocity 5.4 m -8.1m/1.3m/s - -2.2m/s equals .77 seconds To get part b, plug in the time to both original equations and get about 6.4 meters for both

Slow equal to the

Rise/run of a line

is it possible for two diff objects to have the same speed but diff velocities?

Yes if they are traveling in diff directions

Can you take a walk in such a way that the distance you cover is greater than the magnitude of your displacement?

Yes! When traveling between two points, the distance covered is always either equal or greater than the displacement. Distance can never be less than the displacement. Or show number line where it's 0m is physics 5m is math 8m is physics and 14m is English and you travel from math to English to physics. Distance is 15m and displacement is 3m

Is it possible for you to take a hike and have the distance you cover be equal to the magnitude of your displacement?

Yes. Distance traveled and the magnitude of the displacement are equal if you walk in a straight line in one direction

Symbol: Displacement

Trianglex

displacement formula

Trianglex=xf-xi

Long version of average velocity

Vav =trianglex/trianglet=xf-xi/tf-ti

An object's location is defined by a

Vector drawn from the origin to the object

How is displacement calculated?

by subtracting final minus initial position

What does the position-time graph look like for an obj moving with constant velocity?

a straight line

The steeper the slope, the greater the

avg speed

symbol of average velocity

bug v then subscript av