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Mechanics

IB Physics: Mechanics

IB Physics: Mechanics

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Florian Spiess
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Florian Spiess
This flashcard set delves into the fundamental principles of mechanics, particularly focusing on uniformly accelerated motion. It covers key concepts like velocity, displacement, acceleration, and the SUVAT equations, which are essential for solving problems involving motion. The set also explores how to interpret graphs related to motion, such as acceleration-time and velocity-time graphs, and defines important terms like instantaneous and average velocity. This flashcard set is invaluable for students and enthusiasts of physics who need to understand and apply these core mechanical principles in their studies or research.
Flashcards
12
Students
2
Language
English
Category
Physics
Level
Other
Created / Updated
18.04.2013 / 01.08.2017
  • 1  / 12

Flashcards

Define Average Velocity.

The total displacement of the object in the total time:

Velocity (Vav) = total displacement (s) / total time (t)

Define Instantaneous Velocity.

The velocity at any one instant:

v = Δs / Δt

Where Δt is tending towards zero

v = ds / dt

velocity is the derivative of displacement with regards to time

What does the slope on a displacement-time graph represent?

velocity

What does the slope on a velocity-time graph represent?

acceleration

What does the area under a velocity-time graph represent?

displacement

What does the area under an acceleration-time graph represent?

velocity

How many equations of uniformly accelerated motion are there?

What is the first suvat equation, which is concerned with finding acceleration or velocity?

a = change of velocity / time taken

a = final velocity (v) - initial velocity (u) / time (t)

therefore: v = u + at

What is the second suvat equation, which is concerned with finding displacement without use of acceleration?

Since: average velocity = initial velocity (u) + final velcoity (v) / 2

and: average velocity = displacement (s) / time (t)

s / t = u +v / 2

Therefore: s = 1/2 (u + v) t

What is the third suvat equation, which is concerned with finding displacement without the use of final velocity?

Since: final velocity = initial velocity + acceleration * time

v = u + at

Hence: s = 1/2 (u + u + at) t

and: s = ut + 1/2 at2

What is the fourth suvat equation, which is concerned with finding final velocity without the use of time?

Eliminate t from suvat equation 3 by substituting:

t = (v - u) / a

which can be derived from suvat equation 1 to make:

v2 = u2 + 2as

When are the suvat equations useful?

When three or four of s, u, v, a or t are known and the others need to be found.

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