science 2 Flashcards

1
Q

what is gravity?

A

non contact force that gives an obgect its weight

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2
Q

what is an unbalanced force

A

an unbalanced force changes an object motion

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3
Q

what is a force

A

a push, pull or twist motion

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4
Q

what is mass

A

mass is how much matter is inside you

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5
Q

what is matter

A

matter is the pull of gravity on your mass

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6
Q

what is newton N

A

newton n measures the amount of force needed to move or lift an object

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7
Q

what is a balanced force

A

a balanced force dose not change an objects motion

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8
Q

what is air resistance

A

opposite force to gravity

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9
Q

what is newtons first law

A

an object in motion will remain in motion and an object at rest will remain in rest unless acted upon be an external unbalanced force

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10
Q

what is friction

A

friction is the resistance against the movement of an object

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11
Q

what causes friction

A

surface roughness, deformations

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12
Q

what is a simple machine

A

devices that make it easier to do work

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13
Q

what is a leaver

A

simple machine that uses the turning effect of a force to make a task easier

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14
Q

what is the fulcrum

A

turning point of a leaver

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15
Q

What is the load

A

Resistance to motion that a leaver works against

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16
Q

what is effort

A

force required to cause movement

17
Q

what is the first class leaver

A

EFL e.g hammer removing nail

18
Q

what is the second class leaver

A

ELF, e.g wheelbarrow

19
Q

what is a 3rd class leaver

A

FEL, e.g tweezers, tongs

20
Q

what is sinking

A

pushing the liquid to the side

21
Q

what is floating

A

liquid pushes back on the object