Year 2 - Mechanics Flashcards

1
Q

Formula for moment?

A

☆ Moment = Force x Perpendicular Distance.

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2
Q

What is the definition of a moment?

A

☆ The moment of the force measures the turning effect of the force on a rigid body.

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3
Q

Where should moments be taken about usually?

A

☆ Take moments about unknown variable, to eliminate any unknowns.

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4
Q

What does resting on supports imply?

A

☆ Equilibrium.

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5
Q

What does tilting about A imply?

assuming a straight line A - B.

A

☆ Tilting about A -> Rb = 0

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6
Q

What does tilting about B imply?

assuming a straight line A - B.

A

☆ Tilting about B -> Ra = 0

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7
Q

How can we find Fmax?

A

☆ Fmax = μR

μ = Coefficient of Friction

R = Normal Reaction Force

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8
Q

What if applied force > Fmax?

Applied forces and Frictional forces are acting on a Box.

A

☆ The box will accelerate.

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9
Q

What if applied force = Fmax?

Applied forces and Frictional forces are acting on a Box.

A

☆ Box remains at limiting equilibrium.

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10
Q

What if applied force < Fmax?

Applied forces and Frictional forces are acting on a Box.

A

☆ Box remains at rest.

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11
Q

If particle is in equilibrium…

A

☆ F ≤ F max = μR

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12
Q

When a particle is accelerating on a rough plane…

A

☆ Friction = Fmax = μR

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13
Q

When two objects meet in kinematics, what does this imply?

A

☆ S = r

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14
Q

In kinematics, what is the formula for an object moving with constant velocity?

A

v = u + at

r(t) = r(0) + vt

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15
Q

In kinematics, what is the formula for an object moving with constant acceleration?

A

s = ut+ 1/2 at^2

r(t) = r(0) + ut+ 1/2 at^2

ut+ 1/2 at^2 represents s(t) in kinematics.

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16
Q

If the position of the object is north, what does this imply?

A

☆ The vector i component = 0

17
Q

If the position of the object is south, what does this imply?

A

☆ The vector j component = 0

18
Q

If the position of the object is north-east, what does this imply?

A

☆ The vector i component = The vector j component

19
Q

If the position of the object is north-west, what does this imply?

A

☆ The vector -i component = The vector j component

20
Q

In projectile motion, how can we improve the model?

A

☆ Take into account one of the below:

  1. Air resistance
  2. Weight of the ball.
  3. Spin
21
Q

In projectile motion, what do we know about the horizontal component of velocity?

A

☆ Remains constant throughout the journey.

22
Q

To find the maximum of the distance?

A

Smax:

☆ Differentiate S, then make it = 0

23
Q

What does the ‘Speed of Projection’ mean?

A

☆ Initial Speed = | v |

24
Q

What does ‘P is moving parallel to j’ imply?

A

☆ P is moving in the same direction as j.

25
Q

When integrating vectors, or any indefinite integral, what should we remember?

A

☆ To note down the constant of integration!