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Science > Motion > Flashcards

Motion Flashcards

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0
Q

Position

A

The location of an object or place

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1
Q

Describe an objects position using a reference point.

A

The lamp is on the table
The lamp is next to the chair
The table is under the lamp

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2
Q

Motion

A

A change in position over time

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3
Q

Speed

A

How quickly or slowly something changes position in a given amount of time

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4
Q

Velocity

A

Speed in a specific direction

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5
Q

Acceleration

A

How quickly something’s velocity changes over time

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6
Q

Vector

A

A quantity that has both size and direction

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7
Q

Reference point

A

A location to which you compare another location

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8
Q

Describe the relative motion of an object using a particular frame of reference

A
  • The jetplane is in motion relative to the ground
  • The jet plane is not moving or stationary relative to the passengers on the
  • The jetplane is not moving or stationary relative to a plane flying directly next to it at the same speed
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9
Q

Define speed

-units

A

How quickly or slowly something changes position in a given amount of time
S=d/t
m/s. cm/s. km/hr

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10
Q

Solve speed problems

A 
S=D/T 
Magic triangle.    D
                         S  x  T 
T=D/S
D=SxT
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11
Q

Describe and interpret distance- time graphs

A

How far something goes in a given amount of time

Distance. Time

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12
Q

Straight diagonal line on a distance- time graph

A

Constant speed

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13
Q

Straight flat, horizontal line on a distance time graph

A

Not moving
No motion
Stationary
Stopped

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14
Q

An upward slope on a distance time graph

A

Increasing speed

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15
Q

Downward slope on a distance- time graph

A

Decreasing speed

16
Q

Define and be able to describe examples of vectors

A

A quantity that has both size and direction

The car is going 50 m/hr north

17
Q

Define velocity

-units

A

Speed in a specific direction

m/s. cm/s. km/hr

18
Q

Compare speed and velocity

A

Both involve distance and time

Use the same units. Ex- m/s

19
Q

Difference between speed and velocity

A

Velocity is a vector

Velocity uses direction

20
Q

Explain the relationship between velocity and acceleration

A

In final velocity subtracted for the initial velocity over the change in time will give acceleration

21
Q

Define acceleration

- units

A 
How quickly something's velocity changes over time
m/s/s.   m/s2.       cm/s/hr
A=vf-vi
    ------
     ⚠️T
22
Q

Describe and interpret velocity- time graph

A

How fast or slow something goes in a certain direction over a given amount of time

23
Q

Straight diagonal line on a velocity- time graph

A

Increasing speed

Accelerating

24
Q

A straight flat, horizontal line on a velocity- time graphs

A

Constant speed

25
Q

An upward slope on a velocity- time graph

A

Accelerating
Increasing speed
Accelerating faster

26
Q

A downward slope on a velocity- time graph

A

Deceleration
Decreasing speed
Going slower

27
Q

Why is it important to know velocity rather than just speed

A

So you can know the direction as well rather than just how fast or slow it is going

28
Q

If an object is moving at a constant speed, can it be accelerating?

A

Yes, because acceleration occurs when you change speed or direction. So you can be going the same speed but change direction.

29
Q

What are some examples of acceleration?

A
  1. Increase
  2. Decrease
  3. Direction
  4. A car going north
  5. A train that is coming to a stop
  6. On a roller coaster when it is picking up speed going down the hill
30
Q

At what speed did a plane fly if it traveled from 1760meters in 8 seconds?

A

S=S S=d/t
D= 1760m 1760m
T= 8s ——
8s S=220 m/s

31
Q

An airplane, starting from rest accelerates to a velocity of 30 m/s in 15 seconds. What is the acceleration of the airplane?

A

A=A A=vf-vi
VI= 0 m/s ——-
VF= 30 m/s ⚠️T
T= 15s A= 30m/s- 0m/s
————–
15s A= 2m/s/s

32
Q

A= 10m/s - 5m/s
—————
5s

A

A=1m/s/s

33
Q

Find vf.

.5m/s/s= vf - 0m/s
———–
20s

A

Cross multiply
.5m/s/s vf
——— —-
1s 20s A= 10m/s

34
Q

Calculate the average speed of a car that has traveled from 125 miles to 320 miles in 3 hours.

A

S=S S=D/T
D= 320 -125= 195mi S= 195mi
T= 3hr ———
3hr S= 65mi/hr

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