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Physics > Moments and circular motion > Flashcards

Moments and circular motion Flashcards

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1
Q

What is a moment?

A

The turning effect of a force

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2
Q

What is the equation for the size of a moment?

A

Moment (Nm) = Force (N) x Distance (m)

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3
Q

How can you increase a moment?

A

Increase the force

Increase the distance

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4
Q

What is the centre of mass?

A

The point of an object through which the whole weight acts

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5
Q

What happens when an object is suspended?

A

It will come to rest with its centre of mass directly below the suspension point

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6
Q

What is the law of moments?

A

Total clockwise moments = Total anticlockwise moments

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7
Q

What would happen if the line of action exceeds its base?

A

It will become unstable

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8
Q

How can stability be increased?

A

Lower centre of mass

Wider base

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9
Q

When an object moves in a circle, it …..

A

accelerates towards the centre

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10
Q

The acceleration doesn’t change the speed but the…

A

velocity

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11
Q

The resultant force causing the acceleration is called the…

A

centripetal force

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12
Q

How do you increase the centripetal force?

A

Increase mass of object
Increase speed of object
Decreasing radius of circle

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13
Q

What force keeps objects in orbit?

A

Gravity

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14
Q

What shape is an orbit?

A

Ellipse

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15
Q

What happens to gravity when the distance between 2 bodies increases?

A

Gravity decreases

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16
Q

What do communication satellites do?

A

Radio, TV and phone call connections

17
Q

What orbit do communication satellites have and what does this mean?

A

Geostationary - it stays over the same point over the equator, so its period is 24 hours

18
Q

What do monitoring satellites do?

A

Monitor the atmosphere so weather forecasts can be made

19
Q

What orbit do monitoring satellites have and what does this mean?

A

Polar - they are low to the earth and they travel around the earth several times a day from pole to pole

Physics (7 decks)

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