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AS Physics > Mechanics > Flashcards

Mechanics Flashcards

0
Q

How do you calculate ever age speed?

A

Speed = distance / time

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1
Q

How do you calculate work done?

A

Work done = force x distance

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2
Q

What is the SI unit of light intensity?

A

Candela

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3
Q

What are the differences between scalars and vectors?

A

A scalar has only magnitude and no direction

A vector has both magnitude and direction

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4
Q

To work out the components of a vector what equations should you use?

A

A^2 + b^2 = c^2
and
Sohcahtoa

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5
Q

What are the SUVAT EQUATIONS?

A 
S = ut + 1/2At^2
V^2 = u^2 + 2as
V = u+at
S = ((u+v)/2) x t
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6
Q

What is the force when a car of 9000N is accelerating at 7ms^-2

A

6422N

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7
Q

In a free body diagram what are the 2 equations you should use initially to work out what is going on?

A

Sigma F = 0

Sigma F = ma

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8
Q

What equation relates force and velocity

A

Force = KV^2

Force is proportional to V^2

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9
Q

What is the equation to calculate torque?

A

Torque = force x perpendicular distance from the pivot

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10
Q

What is the equation to calculate Kinetic Energy?

A

KE = 1/2mv^2

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11
Q

What equation calculates change in gpe?

A

/\Gpe = mg/\h

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12
Q

What equation relates gpe and KE?

A

V = root 2gh

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13
Q

What are the equations to calculate power?

A

Power = work done / time

Power = force x constant velocity

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14
Q

What is the equation to calculate efficiency?

A

m = (useful energy out / total energy in) x 100

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15
Q

How do you calculate pressure?

A

Pressure = force(N) / area

16
Q

Stress acts like pressure, but within the object.

What is the equation to calculate stress?

A

Stress = force (N) / cross sectional area (m^2)

17
Q

What is the equation for the hugs modulus?

A

E = stress / strain

18
Q

What is the equation to calculate strain?

A

Strain = change in length / original length

19
Q

What is the equation to calculate area

When given length, mass and density?

A

Area x length = mass / density

20
Q

What is Newton’s first law?

A

A body does not change velocity unless acted on by a force.

21
Q

What is Newton’s second law?

A

The rate of change of momentum is directly proportional to the resultant force acting on it.

22
Q

What is Newton’s third law?

A

Every force has an equal and opposite reaction

AS Physics (10 decks)

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