Section 5.1 - Further Mechanics Content Flashcards Preview

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Flashcards in Section 5.1 - Further Mechanics Content Deck (18)
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1

What is the term given to an object rotating at a steady rate?

Uniform circular motion

2

If an object is travelling in a circle in the vertical plane, where are the points of minimum and maximum tension?

Minimum tension at the top
Maximum tension at the bottom

3

Define centripetal force

The force that makes the object move in a circle

4

Why do planes turn when at an angle?

The lift force is comprised of a horizontal and vertical component.
The horizontal component provides the centripetal force causing it to turn.

5

What kind of motion will a pendulum perform?

Simple harmonic motion

6

What is the period of oscillation?

The time for one complete cycle of oscillation.

7

If a trolley is at equilibrium attached to two springs, when pushed in one direction, what will the trolley do and why?

It will accelerate toward the equilibrium point.
The extended spring provides a restoring force.

8

If the graph of displacement is sin(x), what will the respective graphs of velocity and acceleration look like?

Velocity as cos(x)
Acceleration as -sin(x)

9

Describe a freely oscillating object

It oscillates with a constant amplitude because there is no friction acting on it.

10

What is natural frequency?

The frequency of free oscillations of an oscillating system.

11

What are forced vibrations?

Making an object oscillate at a frequency that is not it’s natural frequency

12

When does resonance occur?

When the driving force or oscillation matches the natural frequency of the system.

13

What is the outcome of resonance?

An increase in amplitude of the system’s oscillation.

14

What is damping?

The term used to describe the removal of energy from an oscillating system.

15

What are the three levels of damping?

Light
Heavy
Critical

16

Describe light damping of a system

The system oscillates over a long time frame before coming to rest.
The amplitude of the oscillations follow a decay envelope.

17

Describe heavy damping

The oscillating system returns to zero over an extended time frame.
(No discernible oscillation)

18

Describe critical damping

The oscillating system returns to the zero position of the oscillation after one quarter of a time period.
Does not affect frequency.