Why 103 week 2

Physics week 2: Distance vs Displacement Speed Vs Velocity

The speedometer of an Automobile reads:

	a.	accelerated speed.
	b.	average speed.
	c.	instantaneous speed.

QUESTION 2

The two measurements necessary for calculating average speed are

	a.	velocity and distance.
	b.	distance and acceleration.
	c.	velocity and time.
	d.	distance and time.
	e.	acceleration and time.

QUESTION 3

When you walk with an average speed of 2 m/s, in 5 s you'll cover a distance of...

	a.	20 m.
	b.	10 m.
	c.	2 m.
	d.	15 m.

QUESTION 4

The average speed of a horse that gallops 10 kilometers in 0.5 hours is

	a.	40 km/h.
	b.	15 km/h.
	c.	30 km/h.
	d.	20 km/h.

QUESTION 5

A cart maintains a constant velocity of 100 m/s for 10 seconds. During this interval, its acceleration is

	a.	zero.
	b.	1 m/s2.
	c.	10 m/s2.
	d.	none of the above

QUESTION 6

A scalar is a quantity that is fully described by ____.

	a.	both its displacement and its velocity
	b.	magnitude alone
	c.	both its magnitude and its direction
	d.	both its distance and its speed

QUESTION 7

A vector is a quantity that is fully described by ____.

	a.	both its displacement and its velocity
	b.	magnitude alone
	c.	both its distance and its speed
	d.	both its magnitude and its direction

QUESTION 8

Which of the following is NOT TRUE when comparing DISTANCE and DISPLACEMENT?

	a.	Both distance and displacement measure how far an object is from the starting point.
	b.	Distance measures to total length traveled, including all turns, while displacement only includes the distance from the starting point.
	c.	Distance is a scalar quantity and displacement is a vector quantity, meaning it has direction.
	d.	Both distance and displacement measure how far an object has traveled.

QUESTION 9

A player on a soccer field walks 100 meters to the East, turns North and walks 150 meters, turns West and Walks 100 meters, and finally turns south and WALKS 150 meters. What is the TOTAL DISTANCE TRAVELED and what is the TOTAL DISPLACEMENT?

	a.	Total Distance is 200 meters & the Total Displacement is 450 meters east.
	b.	Total Distance is 350 meters & the Total Displacement is 74 meters.
	c.	Total Distance is 25 meters & the Total Displacement is 100 meters to the east.
	d.	Total Distance is 500 meters & the Total Displacement is 0 meters.
	e.	None of the above.

QUESTION 10

How far has a car traveled in 4 hours if it is constantly moving at 60 miles / hour?

	a.	60 miles.
	b.	64 miles.
	c.	240 miles.
	d.	4 miles.

QUESTION 11

How long will it take a boat, moving at 5.6 m/s, to travel 100 meters?

	a.	560 seconds.
	b.	100 seconds.
	c.	0.056 seconds.
	d.	17.9 seconds.

QUESTION 12

Pick the correct statement regarding velocity and speed.

	a.	Velocity tells you how fast an object moves. Speed tells you how fast and in which direction an object moves.
	b.	Speed tells you how fast an object moves. Velocity tells you how fast and in which direction an object moves.
	c.	Velocity tells you an objects direction only.
	d.	Speed tells you an objects direction only.

QUESTION 13

Which of the following are NOT velocities? In other words, which are speeds?

	a.	60 miles/hour.
	b.	-100 m/s.
	c.	+54 m/s.
	d.	70 miles/hr northeast.

QUESTION 14

A car is driving at a certain speed. Unfortunately, there is an oil leak and the car drops a plop of oil on the ground every second the car is in motion. The oil drop pattern looks like ...
Start* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
You collect time (X - indepentent variable) and displacement of car (Y - independent variable) data by measuring how far the car has traveled from the starting point as each second goes by. Graph the data below using EXCEL and SELECT the likely mathematical relationship between displacement and time.

Time (seconds)	Displacement (meters)
0	0
1	8
2	16
3	24
4	32
5	40
6	48
7	56
8	64

		Quadratic
		Inverse
		Square root
		Linear

2 points

QUESTION 15

A car is driving at a certain speed. Unfortunately, there is an oil leak and the car drops a plop of oil on the ground every second the car is in motion. The oil drop pattern looks like ...
Start* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
You collect time (X - indepentent variable) and displacement of car (Y - independent variable) data by measuring how far the car has traveled from the starting point as each second goes by. Graph the data below using EXCEL and, based on your data and graph, determine the SLOPE (Rate of Change), of the displacement with respect to time. What does the slope of the displacement vs time graph represent?

Time (seconds)	Displacement (meters)
0	0
1	8
2	16
3	24
4	32
5	40
6	48
7	56
8	64

		8 m/s
		2 m/s
		6 m/s
		12 m/s

2 points

QUESTION 16

The correlation coefficient, or (R) value, tells you...

		Tells you the inverse relationship between the X and Y data
		The combination coefficient that tells you the degree to which the Z and A data are predict one another.
		The strength and direction of the relationship between the X and Y data on a graph.
		Tells you the probability that the X data can be predicted by the temperature at the time of data collection.

QUESTION 17

The greater the time it takes to travel 100 miles, the ....

		Greater the velocity
		The slower the velocity
		Time makes no difference when it comes to calculating velocity
		The distance or displacement has no bearing on the velocity of an object.

QUESTION 18

The coefficient of determination (R²) tells us.....

		How close the trendline fits your actual data.
		The relationship between Y and Z.
		The relationship between your table and your graph.
		There is no relationship between R² and your data.

QUESTION 19

You perform an experiment, where you placed a 1 kg piece of metal on a vibrating plate. You increased the vibration frequency by 5 hertz every 2 minutes and then measured the temperature of the metal that resulted. The data below represents your results. Graph the data using Excel as we discussed in class and pick the graph that best represents the trend of this data.

Vibration Frequency (Hertz)	Temperature (Celcius Degrees)
5	22.1
10	24.0
15	26.1
20	28.2
25	30.0
30	31.8
35	33.0
40	35.1
45	37.2

	a.	Quadratic relationship with temperature decreasing as that frequency increases.
	b.	Inverse relationship where temperature decreases as vibration frequency increases.
	c.	There is no relationship between increasing the vibration frequency and the temperature of the metal.
	d.	Linear relationship where temperature of metal increases in a linear fashion as the vibration frequency increases.