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Physics - Mechanics - Looking at Forces > Mass, Weight And Centre Of Gravity > Flashcards

Mass, Weight And Centre Of Gravity Flashcards

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1
Q

The mass of a body makes it […….][…..] in […..]

A

The mass of a body makes it resist changes in motion

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2
Q

What is mass measured in?

A

Kg

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3
Q

The […..] an objects mass, the greater its resistance to a change in velocity

A

Greater

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4
Q

What is weight measured in?

A

Newtons (N)

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5
Q

What does the weight of an object vary according to?

A

The size of the gravitational field acting on it.

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6
Q

Weight equation.

A

Weight = Mass X Gravitational field strength

W = mg

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7
Q

What is the earth gravity?

A

9.81 Nkg-1

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8
Q

What is the difference between mass and weight?

A

Mass is a Scalar

Weight is a vector

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9
Q

What does the centre of gravity assume?

A

All the mass is in one place

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10
Q

The centre of gravity is the single point that you can consider its [….][….][..][….][……]

A

While weight to act through

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11
Q

The object will always […..] around the centre of gravity

A

Balance

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12
Q

Can the centre of gravity fall outside an object?

A

Yes

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13
Q

How can you find the centre of gravity of an object?

A

By symmetry or experiment

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14
Q

How can you find the centre of gravity using symmetry?

A

Draw lines of symmetry and were the lines cross is the centre of gravity

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15
Q

How do you find the centre of gravity by experiment?

A

Use it on a irregular object

  • Hang object freely from a point
  • Draw vertical line downwards from point of suspension, use a plumb Bob
  • Hang the object from a different point
  • Draw another vertical line down
  • centre of gravity is were the two lines cross
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16
Q

How high the centre of gravity tells us what?

A

How stable an object is

17
Q

What kind of centre of gravity does a stable object have?

A

Low centre of gravity and wide base area

18
Q

What kind of centre of gravity does a unstable object have?

A

Higher centre of gravity and smaller base area

19
Q

When will an object fall over?

A

If the vertical line downwards from its centre of gravity falls outside its base area.

Physics - Mechanics - Looking at Forces (37 decks)

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