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Science > science 4 > Flashcards

science 4 Flashcards

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1
Q

what is the definition of a force

A

Forces are a push or a pull or twist…in a particular direction

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2
Q

what is the definition of a unbalnced force

A

If the effects of the forces don’t cancel each other, they are unbalanced forces.

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3
Q

what is the definition of a balanced force

A

Two or more opposite forces are balanced forces if their effects cancel each other

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4
Q

what is the definition of air restisistance

A

oppositie force to gravity

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5
Q

what is the definition of gravity

A

Is a non-contact force,
It is a force that pulls and
Gives an object its weight

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6
Q

what is the definition of friction

A

Friction is a resistance against the movement of an object

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7
Q

what is the definition of magnetism

A

non contact force

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8
Q

what causes friction

A

friction is caused by the interactions between the tiny bumps on the surface

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9
Q

what is the definition of neutral buoyancy.

A

neutral boyancy is If the buoyancy equals the weight

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10
Q

whats mass

A

how much matter is inside u

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11
Q

whats weight

A

measure of the pull of gravity on ur mass

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12
Q

what are newtons

A

the international unit of measure for force.

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13
Q

what are simple machines

A

Simple machines are devices that make it easier to do work.

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14
Q

what order does the 1st class lever go in

A

efl

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15
Q

what order does the 2nd class go in

A

elf

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16
Q

what order does the 3rd class lever go in

A

fel

17
Q

what is a fulcrum

A

The turning point of a lever

18
Q

what is a lever

A

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

19
Q

what is a effort

A

The force required to cause movement

20
Q

what is a load

A

The resistance to motion that a lever works against is the load

21
Q

what is newtons first law

A

An object in motion will remain in motion, or an object at rest will remain at rest unless acted upon by an external unbalanced force

22
Q

what is terminal velocity

A

Terminal velocity is steady speed achieved by an object freely falling through a liquid

23
Q

what is inertia

A

inertia is the quality in matter that lets it stay still if it is still and keeps it moving if it is moving

24
Q

what is sinking

A

Objects that sink push on a liquid.

25
Q

what is boyancy

A

The liquid pushes back on the object.

26
Q

what is static friction

A

There is friction between stationary objects

27
Q

what is kinetic friction

A

There is friction between objects that move

28
Q

what is unwanted friction

A

whenu dont want friction

29
Q

what is useful friction?

A

is when u want friction

30
Q

what is floating

A

If the buoyancy exceeds theweight, then the object floats

31
Q

what is density

A

how muchmassa substance has

32
Q

what is densitys formula

A

D = m/V or density = mass/ volume

33
Q

what is Archimedes’ Principle

A

Thebuoyant forceon a submerged object is equal to theweightof the liquid displaced by the object

Science (10 decks)

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