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Year 9 Physics > Forces 1 > Flashcards

Forces 1 Flashcards

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1
Q

What is a force?

A

a force is a push or pull on an object caused by it interacting with another object

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2
Q

What can (unbalanced) forces do?

A

when an object experiences a force, it can:

  • deform (change shape)
  • change speed (move: acceleration, deceleration)
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3
Q

Contact or non-contact?

friction

A

contact

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4
Q

Contact or non-contact?

push/pull

A

contact

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5
Q

Contact or non-contact?

drag (water/air resistance)

A

contact

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6
Q

Contact or non-contact?

lift (force on wings that keep it up)

A

contact

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7
Q

Contact or non-contact?

upthrust (upward force exerted on object in liquid)

A

contact

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8
Q

Contact or non-contact?

normal contact force (force exerted on an object through contact with a solid)

A

contact

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9
Q

Contact or non-contact?

weight

A

non-contact

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10
Q

Contact or non-contact?

magnetism

A

non-contact

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11
Q

Contact or non-contact?

electrostatic

A

non-contact

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12
Q

Contact or non-contact?

tension (force in a string holding up a picture)

A

contact

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13
Q

Contact or non-contact?

thrust (propulsive force from an engine)

A

contact

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14
Q

What is weight?

A

weight is the force acting on an object due to gravity

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15
Q

What is weight measured in?

A

Newtons (N)

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16
Q

What is mass measured in?

A

kilograms (kg)

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17
Q

What is gravitational field strength measured in?

A

Newtons per kilogram (N/kg)

18
Q

What is the formula for weight?

A

weight = mass x gravitational field strength (W=mg)

19
Q

What is the formula for mass?

A

mass = weight / gravitational field strength (m=W/g)

20
Q

What is the formula for gravitational field strength?

A

gravitational field strength = weight / mass (g=W/m)

21
Q

Can mass change?

A

no

22
Q

Can weight change?

A

yes

23
Q

What is upthrust?

A

The upward force exerted on an object that is in or on a fluid

24
Q

What is friction?

A

The force that opposes movement of an object sliding over a surface

25
Q

What is tension?

A

The force in a string holding up a picture

26
Q

What is lift?

A

the force on the wings of an aircraft that keeps it flying

27
Q

What is normal contact force?

A

the force that a solid surface exerts against an object

28
Q

What is drag?

A

the force that acts against an object moving through fluid.

29
Q

What is thrust?

A

the propulsive force from an engine

30
Q

What is electrostatic?

A

the force between charged particles

31
Q

What is magnetic?

A

The force between a magnet and an iron nail

32
Q

Elastically deformed

A

An object has been elastically deformed if it can go back to its original shape and length when the force is removed.

33
Q

Inelastically deformed

A

An object has been inelastically deformed if it doesn’t return to its original shape and length when the force is removed.

34
Q

What is Hooke’s law?

A

The extension of an object that obeys Hooke’s law is directly proportionate to the force applied. Any % change in one variable leads to a % change in the other variable.

35
Q

What is the formula for Hooke’s law?

A

Force = spring constant x extension (F=ke)

36
Q

What is force measured in?

A

Newtons (N)

37
Q

What is the spring constant measured in?

A

Newtons per metre (N/m)

38
Q

What is the extension measured in?

A

metres (m)

39
Q

When is Hooke’s law applicable?

A

Hooke’s law is only applicable up to the limit of proportionality.

40
Q

What does “∝” mean?

A

directly proportional

41
Q

What is the “spring constant”?

A

the spring constant is the measure of the “stiffness” of the spring (how easy it is to stretch)

Year 9 Physics (6 decks)

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