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Physics 30 > Kinematics > Flashcards

Kinematics Flashcards

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1
Q

Kinematic equation 1?

A

Missing change in distance. Vf=Vi+aΔt

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2
Q

Kinematic equation 2?

A

Missing acceleration. Δd = 1/2 (Vi+Vf)Δt
This is the trapezoid equation.

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3
Q

Kinematic equation 3?

A

Missing Vf. Δd = ViΔt + (1/2)a(Δt^2)
Square + triangle

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4
Q

Kinematic equation 4?

A

Missing Vi. Δd = VfΔt- (1/2)a(Δt^2)
Bigger square - triangle

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5
Q

Kinematic equation 5?

A

Missing time. Vf^2 = Vi^2 + 2aΔd

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6
Q

Mneumonic to help remember the order of kinematic equations?

A

Don’t Accept Fairly Illegal Things
What is missing from each of the 5 equations?
D: Distance
A: Acceleration
F: Final Velocity
I: Initial Velocity
T: Time

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7
Q

What should you be when doing questions?

A

Systematic, organized, and logical.

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8
Q

What are some general steps to take when solving a question?

A

Read carefully. Identify the unknown. Substitute. Always use units. Box your final answer.

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9
Q

What is kinematics the study of?

A

The study of motion (displacement, velocity, time, accelerations). Motion, but not the causes of motion.

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10
Q

What is motion?

A

The movement of an object from one place to another, measured over time intervals and relative to position of observer or the reference point.

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11
Q

Types of motion?

A

Uniform; Constant speed in a single direction.
Accelerated; Motion moving with changing speed, direction, or both.
Periodic; A repeating motion pattern in equal intervals of time (A special type of accelerated motion).

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12
Q

What is the difference between vectors and scalars?

A

Vectors have direction and magnitude. Scalars have magnitude only.

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13
Q

What are some vectors in kinematics?

A

Displacement. Acceleration. Momentum. Force.

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14
Q

What are some scalars in kinematics?

A

Distance. Speed. Time. Mass. Energy (covered later).

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15
Q

What is position?

A

Where one object is with respect to a reference point. Can be positive or negative. Uses vector notation.

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16
Q

What is displacement?

A

Describes magnitude and direction of the change in position from the original position.

17
Q

What is distance?

A

Measurement of length, not specific to direction.

18
Q

Speed definition.

A

Rate at which distance changes (only positive; scalar). Represent with V (without vector notation).

19
Q

Velocity definition.

A

Speed, but can be positive or negative. Direction of travel matters. Represent with V (with vector notation).

20
Q

Velocity equation? (As slope).

A

Velocity = Δd / Δt = (df-di) / (tf-ti).

21
Q

What is acceleration?

A

Rate of change of velocity with respect to time. Positive or negative. Represented with the letter a with vector notation.
Units are typically m/s^2 or m/s/s

22
Q

How does acceleration and velocity relate?

A

Positive velocity and acceleration: Forward, speeding up.
Negative velocity and acceleration: Backward, speeding up.
Positive velocity, negative acceleration: Forward, slowing down.
Negative velocity, positive acceleration: Backward, slowing down.

23
Q

What should you remember about lines on a graph of points?

A

If you need a line, use the line of best fit (typically connects farthest points).

24
Q

What is the area under a velocity-time graph?

A

Displacement.

25
Q

What is the area under an acceleration-time graph?

A

Change in velocity.

26
Q

Where might units be found on a graph?

A

By the title of the axis. Ex: V(m/s) or t(s). This way, units are not needed by each number.

27
Q

What to remember about breaking apart projectile motion?

A

Horizontal projectile motion has no acceleration (air resistance is neglected for this unit). Vertical projectile motion is affected by gravity.

28
Q

How do you add vectors? (Using lines)

A

Put on line at the end of another —->—->

29
Q

How do you subtract vectors? (Using lines)

A

Put the starts of the lines together and connect the ends depending on what is subtracted.

30
Q

What is free fall?

A

Falling objects that are not encountering a significant force of air resistance, falling under the sole influence of gravity. In free fall, all objects fall with the same rate of acceleration, regardless of their mass.

31
Q

What is relative motion?

A

How an observer views an object in motion with respect to a medium in motion.

Vac=Vab+Vbc

Movement of a relative to c, is the sum of the movement of a through b and the movement of b through c. For example, movement of a plane relative to the ground is the sum of the movement of the plane relative to the air and the movement of the air relative to the ground.

32
Q

Projectile motion. What is range?

A

The horizontal distance covered.

Physics 30 (6 decks)

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