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Mechanics Revision Special!

A: B:W m.s-1

£100 Kinetic energy is measured in…………?

C: D:m.s-2 J

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That’s incorrect

A: B:Ns Kg.m.s-2

£200Impulse is measured in…………?

C: D:N.s-1 N.kg

Excellent!Excellent!Excellent!Excellent!

SorrySorrySorrySorry

That’s incorrect…

A: B:The initial and final velocities are known

movement is only in one direction

£300We can use the equations of motion (SUVAT) when …………?

C: D:the acceleration is constant

We have remembered to bring a calculator

FantasticFantasticFantasticFantastic

Oh dear!Oh dear!Oh dear!Oh dear!

That’s incorrect…

A: B:momentum impulse

£500In mechanics, p stands for………..?

C: D:potential friction

BrilliantBrilliantBrilliantBrilliant

SorrySorrySorrySorry

That’s incorrect…

A: B:Inelastic collision Perfect collision

£1,000A collision where no kinetic energy is lost?

C: D:Imperfect collision Elastic collision

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Unlucky!Unlucky!Unlucky!Unlucky!

You should know this!

A: B:Ftanθ Fsinθ

£2,000In the diagram, the vertical component of the force is…

C: D:Fcos2θ Fcosθ

`

θ

F

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Oh no!Oh no!Oh no!Oh no!

That’s incorrect!…

A: B:mvr mv2/2

£4,000Centripetal force =

C: D:p2/m mv2/r

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IncorrectIncorrectIncorrectIncorrect

So near and yet so far!

A: B:W/cosθ W/sinθ

£8,000A metal bar (XY) of weight W is hung from a point P by wires. What is the tension in each wire?

C: D:W/2cosθ W/2sinθ

`

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Sorry!Sorry!Sorry!Sorry!

That’s incorrect… I suck!

A: B:1971 1961

£16,000In what year did a man first step foot on the moon?

C: D:1958 1969

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That’s incorrect…

DigestionA: B: 36 m.s–1

£32,000The change in velocity in the first six seconds is….?

C: D:

2.0 m.s–1

Digestion72 m.s–1 0.50 m.s–1

Brilliant!Brilliant!Brilliant!Brilliant!

Unfortunately…Unfortunately…Unfortunately…Unfortunately…

That’s incorrect!

I suck.

A: B:momentum velocity

£64,000The net force acting on a body is zero.

Which of the following quantities must also have zero magnitude for this body?

C: D:acceleration kinetic energy

Well done!Well done!Well done!Well done!

I’m sorryI’m sorryI’m sorryI’m sorry

That’s incorrect…

A: B:mg/(M + m) (M + m)/mg

£125,000A block of mass M on a frictionless table is attached to a mass m.

What is the acceleration of both masses?

C: D:g mg/M

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IncorrectIncorrectIncorrectIncorrect

You should have got that one!

A: B:2100 J 1500 J

£250,000An object of weight 50 N is dragged up an inclined plane at constant speed, through a vertical height

of 12 m. The total work done is 1500 J. The work done against friction is….

C: D:50 J 900 J

Excellent!Excellent!Excellent!Excellent!

Wrong Choice!Wrong Choice!Wrong Choice!Wrong Choice!

That’s incorrect…

I suck.

A: B:200 kN 50 MN

£500,000An electric train develops a power of 1.0 MW when travelling at a constant speed of 50 m.s-1.

The resistive force acting on the train is

C: D:20 kN 200 N

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Sorry!Sorry!Sorry!Sorry!

That’s incorrect…

I suck.

A: B:

£ 1,000,000 M > m. The downward acceleration of the masses is…?

C: D:

Fantastic!Fantastic!Fantastic!Fantastic!

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You were nearly a millionaire!I wished I was as clever and handsome as Mr Porter.

Mr Porter thanks you for playing!Mr Porter thanks you for playing!

Go and learn your definitions!Go and learn your definitions!