1.2 - Kinematics Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

What is dispalcement?

A

the distance of that body from a fixed starting point (in a straight line)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is speed?

A

The distance travelled per unit time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is velocity?

A

the rate of change of displacement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is acceleration?

A

Rate of change of velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The __________ of velocity is the speed of the body. However, the velocity is a _____, meaning that there could be a change in ______.

A

Magnitude
Vector
Direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The mean speed/ velocity is the average measured over a significant amount of time. Give the equations for mean speed and velocity.

A

mean speed = distance travelled/ change in time

mean velocity = change in displacement / change in time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Instantaneous is the speed or velocity at any one instant. Give the equations for instantaneous speed and velocity.

A

Instantaneous speed = speed of a body at a time (rate of change of distance)
Instantaneous velocity = rate of change of displacement at a time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Acceleration of a body is a vector quantity. Give the equation for mean acceleration and instantaneous acceleration?

A

Mean accel = change in velocity / change in time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How to you calculate the ___ from a displacement - time graph.

Average velocity between 2 points
Instantaneous velocity

A

Average V = divide the change in displacement between those two points by the time between them. A-B / T (gradient)

Instantaneous V= gradient of tangent to the curve at that point

Note: if the graph has non-straight lines, the gradient is changing so the velocity is changing and therefore the body is accelerating

Refer to NC 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How do you calculate_______ from a velocity - time graph

mean acceleration
instantaneous acceleration
change in displacement

A

Mean accel = gradient
Instantaneous accel = gradient of tangent to that point
Change in displacement = total area under the graph ( treating areas formed by positive velocity as positive and areas formed by negative velocity as negative)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The difference between speed-time and velocity-time graphs is visible when the _____ becomes _____ and dips below the axis. On a ______ time graph the line will pass below the time axis but on _____-time graph it will never do so

A

velocity
negative
velocity
speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the 4 SUVAT equations?

A

V = u + at
V2 = u2 + 2ax
X = (v + u / 2)t
X = ut + 1/2at2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

You assume in SUVAT equations the acceleration is constant (e.g. air resistance is negligible)

A

Refer to NC 2 and NC 3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In a gravitational field, if a body is moving freely, there is no _______ forces, the only force acting is the _____. _____ acts vertically. If an object has both vertical and horizontal components the horizontal component has no ________ but the vertical does so we can apply v = x / t

A

resistive
weight
weight
acceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

With air resistance, falling objects can reach their terminal velocity. This means you cannot use the kinematic equations as the acceleration is not constant. What is terminal velocity?

A

When an object is falling and the forces of air resistance and weight are equal to one another so the object has no acceleration and falls at a constant velocity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

An object launched horizontally experiences a downward acceleration due to ______. This does not effect its horizontal motion but it will accelerate vertically _______, causing the object to move in a _____. The time taken to fall is the same as if it was dropped from a stationary position.

If the object is launched at an angle, then you must calculate the vertical and horizontal components of the velocity and then apply SUVAT.

A

gravity
downwards
curve