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Science > Forces and speed > Flashcards

Forces and speed Flashcards

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1
Q

Air resistance (drag)

A

the force on an object moving through the air that causes it to slow down (also known as drag)

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2
Q

Balanced forces

A

forces acting on an object that are the same size but act in opposite directions

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3
Q

compress

A

to squash into a smaller space

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4
Q

contact force

A

a force that acts when an object is in contact with a surface, air or water

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5
Q

deform

A

to change shape

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6
Q

drag force

A

the force acting on an object moving through air or water that causes it to slow down

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7
Q

driving force

A

the force that is pushing or pulling something

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8
Q

elastic limit

A

the point beyond which a spring will not return to its original length when the force is removed

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9
Q

electrostatic force

A

the force acting between two charged objects

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10
Q

equilibrium

A

balanced

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11
Q

extension

A

the amount by which an object gets longer when a force is applied

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12
Q

field

A

a region where something feels a force

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13
Q

friction

A

the force that resists movement because of contact between surfaces

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14
Q

gravity

A

a non-contact force that acts between two masses

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15
Q

Hooke’s law

A

the law that says that if you double the force on an object the extension will double

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16
Q

interaction pair

A

when 2 objects interact there is a force on each one that is the same size but in opposing directions

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17
Q

kilogram (kg)

A

a unit of mass, symbol kg

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18
Q

lubrication

A

a substance that reduces friction between surfaces when they rub together

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19
Q

magnetic force

A

the force between 2 magnets, or a magnet and a magnetic material

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20
Q

mass

A

the amount of matter (stuff) a thing is made up of

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21
Q

Newton (N)

A

the unit of force, symbol N

22
Q

newton meter

A

a piece of equipment used to measure weight in newtons

23
Q

non-contact force

A

a magnetic, electrostatic, or gravitational force that acts between objects not in contact

24
Q

steamlined

A

shaped to reduce resistance to motion from air or water

25
Q

tension

A

a stretching force

26
Q

reaction

A

the support force provided by a solid surface like a floor

27
Q

resistive forces

A

any forces that act to slow down a moving object

28
Q

unbalanced

A

opposing forces on an object that are unequal

29
Q

water resistance

A

the force on an object moving through water that causes it to slow down (also known as drag)

30
Q

weight

A

the force of the earth on an object due to its mass

31
Q

independant variable

A

what we change (input variables)

32
Q

dependent variables

A

what we measure (output variables)

33
Q

controlled variables

A

things we keep the same

34
Q

What are the charcteristics of a steamlined shape?

A

rounded front, slowly tapering tail,smooth shape with no projections

35
Q

Push/pull

A

A force exerted to move an object away or towards another object

36
Q

Lift

A

The force pushing upwards on an object flying in the air

37
Q

Upthrust

A

A force pushing upwards on an object in a liquid

38
Q

Thrust

A

A push caused by an engine

39
Q

distance is

A

speed x time

40
Q

speed is

A

distance ÷ by time

41
Q

time is

A

distance ÷ by speed

42
Q

What does weight measure?

A

weight measures the effect gravity has on an object

43
Q

What is weight measured in?

A

Newtons

44
Q

What piece of equipment is used to measure weight?

A

A newton metre

45
Q

What is a measurement of how much of something there is?

A

Mass

46
Q

What is mass measured in?

A

Kilograms (kg)

47
Q

Weight is

A

Mass x gravitational field strength

48
Q

Density

A

Mass ÷ volume

49
Q

What does friction do?

A

Always opposes motion

50
Q

What are 2 ways to reduce friction?

A

Lubrication and streamlining

Science (1 decks)

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