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Physics: P3 > P3.2 Using physics to make things work > Flashcards

P3.2 Using physics to make things work Flashcards

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1
Q

What is the centre of mass?

A

The centre of mass is that point at which the mass of the object may be thought to be concentrated

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2
Q

If freely suspended, an object will…

A

Come to rest with its centre of mass directly below the point of suspension

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3
Q

What is the centre of mass of a symmetrical object?

A

Along the axis of symmetry

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4
Q

What is the equation for a simple pendulum?

A

1
T = ——
f

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5
Q

What does the T stand for?

A

Periodic time in seconds

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6
Q

What does the f stand for?

A

Frequency in hertz, Hz

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7
Q

What does the time period depend on?

A

The length of the pendulum

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8
Q

What is the moment?

A

The turning effect of a force

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9
Q

What is the equation for the size of moment?

A

M = F x d

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10
Q

What does the M stand for?

A

Moment of the force in newton metres, Nm

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11
Q

What does the F stand for?

A

Force in newtons

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12
Q

What does the d stand for?

A

The perpendicular distance from the line of action of the force to the pivot in metres

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13
Q

If an object is turning, the total clockwise moment must be…

A

Exactly balanced by the total anticlockwise moment about any pivot

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14
Q

If the line of action of the weight of an object lies outside the base of an object there will be…

A

A resultant moment and the body will tend to topple

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15
Q

What are some examples of pendulums?

A

swings at playgrounds, some fairground rides, the inside mechanisms of some clocks - eg grandfather clocks

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16
Q

What is the stability of an object affected by?

A

the width of the base of the object, the height of its centre of mass

17
Q

What happens when someone uses a lever?

A

They a exert a force (the effort) around a pivot to move an object (the load)

18
Q

When an object moves in a circle it…

A

Continuously accelerates towards the centre of the circle

19
Q

What does the acceleration change?

A

The direction of motion of the body, not the speed

20
Q

What is the resultant force causing this acceleration called?

A

The centripetal force

21
Q

Where is the centripetal force always directed to?

A

The centre of the circle

22
Q

The centripetal force needed to make an object perform circular motion increases as the mass…

A

Of the object increases

23
Q

The centripetal force needed to make an object perform circular motion increases as the speed…

A

Of the object increases

24
Q

The centripetal force needed to make an object perform circular motion increases as the radius…

A

Of the circle decreases

Physics: P3 (2 decks)

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