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From Flashcardlet > Unit 4 > Flashcards

Unit 4 Flashcards

0
Q

Sammy walks along the aisle of a train at 1 km/hr east inside of the train which is moving at 60 km/hr east. How fast is she moving?

A

Answer = 1 km/hr

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1
Q

When is an object in motion?

A

Answer = when it changes position over time as compared to a reference point

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2
Q

Nina walks along the aisle of a train at 1 km/hr east inside of the train which is moving at 60 km/hr east. How fast is she walking compared to Aspen standing still on the outside of the train? (Pretend Earth is not moving)

A

Answer = 61 km/ hr east

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3
Q

If Randy is walking in the opposite direction of a train moving 60 km/ hr, how fast is he moving?

A

Answer = 59 km/hr

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4
Q

What is speed?

A

Answer = the rate at which an object moves

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5
Q

How do you calculate distance?

A

Answer =

d = r * t

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6
Q

How do you calculate speed?

A

Answer =

s = d/t

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7
Q

How do you calculate time?

A

Answer =

t = d/s

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8
Q

How do you calculate average speed?

A

Answer =

Average Speed = Total Distance Covered/ Time Interval

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9
Q

Noelle travels at a speed of 120 m in 10 seconds, 180 m in 10 sec and 100 in 5 sec. What is her average speed?

A

Answer = 16 m/sec

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10
Q

What is constant speed?

A

Answer = the same speed throughout the motion

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11
Q

Constant speed is always _________ on a distance versus time graph?

A

Answer = diagonal

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12
Q

How do you find the slope?

A

Answer =

Change in distance/change in time

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13
Q

What does the slope of the line represent?

A

Answer = speed of the object

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14
Q

What is velocity?

A

Answer = speed in a direction

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15
Q

As long as motion is in only one direction, how do you find the average velocity?

A

Answer =

Avg. Velocity = distance in a direction/ time interval

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16
Q

If both objects are moving in the same direction, how do you combine their velocities?

A

Answer = add them together

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17
Q

If Annie is walking inside a train at 3 mi/hr east while the train’s traveling at 80 mi/hr east, what is her velocity?

A

Answer = 83 mi/hr east

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18
Q

How do you combine the velocities of two objects moving in opposite directions?

A

Answer = subtract their velocities

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19
Q

If Tim is waking at 3 mi/hr west while a train is traveling at 80 mi/hr east, what is his velocity?

A

Answer = 77 mi/hr east

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20
Q

How fast would Liam have to row a boat upstream (north) at 1 km/hr against a 5 km/hr current flowing south?

A

Answer = 6 km/hr

21
Q

How fast would Danny be traveling if he walked down an escalator at 0.25 m/s and the escalator was moving at 0.5 m/s downward?

A

Answer = 0.75 m/s downward

22
Q

How fast would Shane be traveling if he walked down an escalator at 0.5 m/s and the escalator was moving upwards at 0.25 m/s?

A

Answer = 0.25 m/s downward

23
Q

What is a quantity?

A

Answer = Anything you can assign a number to.

24
Q

What is a vector quantity?

A

Answer = Something that ha size and direction (magnitude and direction).

25
Q

What is a scalar quantity?

A

Answer = Speed, mass, length, area, volume, perimeter. Something that only has size (magnitude) and not distance.

26
Q

What is distance?

A

Answer = a scalar quantity which tells how far. It does not incorporate direction.

27
Q

What is displacement?

A

Answer = A vector quantity which describes your change in position. Includes magnitude and direction.

28
Q

Find the distance and displacement:

Lindsay walks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North.

A

Answer =

Distance = 12 m 
Displacement = 0, because there is no change in where she started from where she ended up.
29
Q

What is Micah’s distance and displacement if he began to run at the school entrance, runs 10 miles and finishes back at the school entrance?

A

Answer =

Distance = 10 miles
Displacement = 0
30
Q

Can you have negative distance?

A

Answer = No!

31
Q

How do you calculate average speed?

A

Answer = total distance/total time

32
Q

How do you calculate average velocity?

A

Answer = displacement/total time

33
Q

What is Stephen’s average speed and average velocity?

Distance = 95 yards Displacement = 55 yards left Time = 10 min

A

Answer =

Average speed = 9.5 yards/min
Average velocity = 5.5 yards/min left

34
Q

What is acceleration?

A

Answer = Rate of change in velocity

35
Q

How do you calculate acceleration?

A

Answer = velocity/time or change in velocity/change in time

36
Q

When you speed up, what type of acceleration is taking place?

A

Answer = positive acceleration

37
Q

When you slow down, what type of acceleration is taking place?

A

Answer = negative acceleration

38
Q

If a change in direction occurs, what other type of change occurs as well?

A

Answer = a change in velocity

39
Q

How do you calculate average acceleration?

A

Answer = final velocity - initial velocity/ time it takes to change velocity

40
Q

What does the slope of the line equal?

A

Answer = average acceleration

41
Q

_____________ slope = faster acceleration or larger change in velocity per time.

A

Answer = steeper

42
Q

Which of the following are examples of acceleration?

A. Bicycle speeding up
B. Runner slowing down 
C. Car going around the corner 
D. Roller coaster car going up and down a hill and around a curve 
E. All of these
A

Answer = E, all of these

43
Q

What is the combined velocity of Alex’s airplane that is flying at 200 km/hr west if it is flying with a 50 km/hr tail wind blowing west?

A. 150.0 km/hr West
B. 200 km/hr East
C. 250 km/hr West
D. 250 km/hr East

A

Answer = C, 250 km/hr West

44
Q

Sean is spinning at a constant rate on a Merry-Go-Round. Which of these is true?

A. Sean is moving at a constant velocity
B. Sean is accelerating because he is changing directions
C. Sean is not moving, but only appears to be moving
D. Sean is changing speed

A

Answer = B, Sean is accelerating because he is changing direction

45
Q

Jack rode his bike west at a constant rate on a very straight and flat road. He traveled one block every 2 minutes. If each block is 10.0 meters long, he is traveling at _____________.

A. Constant speed
B. Constant velocity 
C. 10 m/s West 
D. Both A and B 
E. Both B and C
A

Answer = D, both A (constant speed) and B (constant velocity).

46
Q

Which of these statements is true? More than one can be true.

A. Motion is measured by comparison to one or more reference points.v
B. When combining velocities, you subtract if both motions are in the same direction.
C. A car slowing down as it nears a stop sign is accelerating.
D. If you ride your bike at a constant speed, you may accelerate by changing direction.

A

Answer = A, C, and D

47
Q

Lukas runs 1.4 miles east, turns then runs 1.8 miles west, and finishes with a 1.0 mile sprint eastward. He completes the run in 24 minutes. What is his distance and displacement? What is his average speed and average velocity?

A

Answer =

Distance = 4.2 miles
Displacement = 0.6 miles East
Average Speed = 0 .175 mi/min
Average Velocity = .025 miles/min East

48
Q

Eliza the cheetah sprints at constant speed of 25 m/s. How far will she travel in 2.5 minutes?

A

Answer = 3,750 m

49
Q

Calvin was riding north on his motorcycle at 65 mph until he caught up with Daniel’s slow moving truck entering the highway. He slowed his speed to avoid hitting the truck to 42 mph in 15 seconds. What was his acceleration?

A

Answer = -1.5 mph

From Flashcardlet (27 decks)

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