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H2 Physics > Kinematics > Flashcards

Kinematics Flashcards

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1
Q
A
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2
Q

What are the 2 kinematic equations you need to memorize?

A

v= u+at
s=1/2(u+v)t

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3
Q

Definition of distance

A

Distance is the total length covered by an object irrespective of the direction of motion.

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4
Q

Definition of displacement

A

Displacement is the change in the position of the object relative to its initial position.

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5
Q

Is distance a scalar or vector quantity?

A

Scalar

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6
Q

Is displacement a scalar or vector quantity?

A

Vector

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7
Q

What is the SI unit of distance?

A

metre(m)

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8
Q

What is the SI unit of displacement?

A

metre(m)

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9
Q

A car travels 3.0km due east from point O to A and then a further 3.0km due north of A. Determine the distance covered and its displacement.

A

Distance: 6.0km
Displacement:4.2km(2sf)

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10
Q

Definition of speed

A

The speed of an object is defined as the rate of change of its distance travelled with respect to time.

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11
Q

Definition of velocity

A

The velocity of an object is defined as the rate of change of its displacement with respect to time.

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12
Q

Is speed a scalar or vector quantity?

A

Scalar

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13
Q

Is displacement a scalar or vector quantity?

A

Vector

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14
Q

What is the SI unit of speed?

A

metre per second(m s^-1)

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15
Q

What is the SI unit of velocity?

A

metre per second(m s^-1)

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16
Q

Definition of instantaneous speed

A

Instantaneous speed of an object at a particular instant is the rate of change of distance with respect to time at that instance.

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17
Q

Definition of instantaneous velocity

A

Instantaneous velocity of an object at a particular instant is the rate of change of displacement with respect to time at that instance.

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18
Q

How do you know if a body is said to be moving with constant velocity?

A

A body is said to be moving with constant velocity if the displacement changes at a constant rate.

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19
Q

Definition of acceleration

A

The acceleration of an object is defined as the rate of change of its velocity with respect to time.

20
Q

Is acceleration a scalar or vector quantity?

A

Vector

21
Q

What is the SI unit of acceleration?

A

metre per second squared

22
Q

How do you find the average acceleration?

A

Change in velocity/Total time taken

23
Q

How do you find instantaneous acceleration?

A

dv/dt

24
Q

3 reasons why there can be a change in velocity

A

1)A change in magnitude
2)A change in direction
3)A change in both magnitude and direction simultaneously

25
Q

What is the acceleration of free fall on the Earth’s surface?

A

9.81 m s^-2

26
Q

Difference between acceleration and deceleration

A

Acceleration is the change in velocity. Deceleration is slowing down.

26
Q

What does the instantaneous velocity mean in the displacement-time graph?

A

Gradient of the tangent at a point on the graph

27
Q

What does it mean when the tangent is steeper in a displacement-time graph?

A

The gradient is larger, the velocity is higher.

28
Q

What does the gradient of the velocity-time graph at any point of the velocity-time graph?

A

Instantaneous acceleration

29
Q

What does the area under a velocity-time curve give?

A

Change in displacement

30
Q

What does the are under the acceleration-time graph give?

A

Change in velocity

31
Q

Give the 3 formulas of motion

A

v = u + at
v^2 = u^2 + 2as
s = ut + 0.5at^2

31
Q

What is the magnitude of vector u?

A

(ux ^2 + uy^2) ^ 0.5

32
Q

How do you find the direction of vector

A

tan θ = uy/ux

33
Q

For an object projected at an angle from the ground, for the horizontal direction, what is the initial velocity?

A

ux = u cos θ

34
Q

For an object projected at an angle from the ground, for the horizontal direction, what is the velocity at the highest point?

A

vx = ux

35
Q

For an object projected at an angle from the ground, for the horizontal direction, what is the acceleration?

A

ax = 0

36
Q

For an object projected at an angle from the ground, for the horizontal direction, what is the displacement?

A

sx

37
Q

For an object projected at an angle from the ground, for the vertical direction , what is the initial velocity?

A

uy = u sin θ

38
Q

For an object projected at an angle from the ground, for the vertical direction ,what is the velocity at the highest point?

A

vy = 0

39
Q

For an object projected at an angle from the ground, for the vertical direction, what is the acceleration?

A

-9.81 m s^-2

40
Q

For an object projected at an angle from the ground, for the vertical direction ,what is the displacement?

A

sy

41
Q

For an object projected horizontally off a cliff for the vertical direction ,

A
42
Q
A
43
Q
A
43
Q
A
43
Q
A

H2 Physics (6 decks)

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