Kinematics

Question 1

Kinematic equation 1?

Answer 1

Missing change in distance. Vf=Vi+aΔt

Question 2

Kinematic equation 2?

Answer 2

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

Question 3

Kinematic equation 3?

Answer 3

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

Question 4

Kinematic equation 4?

Answer 4

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

Question 5

Kinematic equation 5?

Answer 5

Missing time. Vf^2 = Vi^2 + 2aΔd

Question 6

Mneumonic to help remember the order of kinematic equations?

Answer 6

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

Question 7

What should you be when doing questions?

Answer 7

Systematic, organized, and logical.

Question 8

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

Answer 8

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

Question 9

What is kinematics the study of?

Answer 9

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

Question 10

What is motion?

Answer 10

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

Question 11

Types of motion?

Answer 11

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).

Question 12

What is the difference between vectors and scalars?

Answer 12

Vectors have direction and magnitude. Scalars have magnitude only.

Question 13

What are some vectors in kinematics?

Answer 13

Displacement. Acceleration. Momentum. Force.

Question 14

What are some scalars in kinematics?

Answer 14

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

Question 15

What is position?

Answer 15

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

Question 16

What is displacement?

Answer 16

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

Question 17

What is distance?

Answer 17

Measurement of length, not specific to direction.

Question 18

Speed definition.

Answer 18

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

Question 19

Velocity definition.

Answer 19

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

Question 20

Velocity equation? (As slope).

Answer 20

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

Question 21

What is acceleration?

Answer 21

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

Question 22

How does acceleration and velocity relate?

Answer 22

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.

Question 23

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

Answer 23

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

Question 24

What is the area under a velocity-time graph?

Answer 24

Displacement.

Question 25

What is the area under an acceleration-time graph?

Answer 25

Change in velocity.

Question 26

Where might units be found on a graph?

Answer 26

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

Question 27

What to remember about breaking apart projectile motion?

Answer 27

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

Question 28

How do you add vectors? (Using lines)

Answer 28

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

Question 29

How do you subtract vectors? (Using lines)

Answer 29

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

Question 30

What is free fall?

Answer 30

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.

Question 31

What is relative motion?

Answer 31

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.

Question 32

Projectile motion. What is range?

Answer 32

The horizontal distance covered.