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Year 9 Forces > forces revision for test > Flashcards

forces revision for test Flashcards

1
Q

which quantities are called scalars?

A

scalars only have size (magnitude)

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2
Q

A quantity known as a vector has

A

both size and direction

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3
Q

We call a force a contact force if

A

the objects are physically touching, for example:

air resistance, tension and frition

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4
Q

We call a force a non contact force if

A

the objects are physically separated, for example:

gravitational force, electrostatic force and magnetic force.

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5
Q

What is weight?

A

weight is the force acting on an object due to gravity.

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6
Q

Is gravitational field strength greater on a smaller or more massive object?

A

massive.

All matter has a gravitational field strength, it is greater the more mass an object has.

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7
Q

Weight of an object and the mass of an object are directly proportional, we calculate it using the formula..?

A

weight = mass x gravitational field strength.

W=mg

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8
Q

Is mass a scalar or vector quantity?

A

scalar (has size only)

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9
Q

Is weight a scalar or vector quantity?

A

vector (size and direction)

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10
Q

What is the unit of weight?

A

newtons, N

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11
Q

What is the unit of mass?

A

kilograms, Kg

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12
Q

What is resultant force?

A

equals the total effect of all the different forces acting on an object.

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13
Q

What is work done?

A

Work is done when a force causes an object to move.

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14
Q

What is the work done equation?

A

work done = force x distance moved along the line of action of the force.

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15
Q

What is work done measured in?

A

joules, J

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16
Q

What is force measured in?

A

newtons, N

17
Q

What is the weight of a 67g object in a gravitational field strength of 10N/kg?

A

0.067 Kg x 10 = 0.67N

18
Q

What is 78Nm in joules?

A

78J
One joule of work is done when a force of one newton causes a displacement of one metre.
1 joule = 1 newton metre

19
Q

How can you calculate force on a spring?

A

force (N) = spring constant (Nm) x extension (m)

20
Q

How is work done on a spring stored?

A

it is stored as elastic potential energy

21
Q

What is Hookes Law?

A

The extension is directly proportional to the stretching force.

22
Q

What is the force of a spring with an extension of 0.1 m and a spring constant of 2N/m?

A

0.1 x 2 = 0.2N

23
Q

What happens to a spring that is taken beyond it’s limit of proportionality?

A

it is permanently deformed.

24
Q

What is compression?

A

the act of pushing particles together

25
Q

What is tension?

A

the particles are pulled further apart.

26
Q

What is inelastic stretching?

A

this is when an object does not return to its original length after the force has been removed.

Year 9 Forces (3 decks)

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