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forces revision > forces and speed > Flashcards

forces and speed Flashcards

1
Q

air resistance

A

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

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2
Q

contact force

A

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

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3
Q

driving force

A

the force that is pulling or pushing something

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4
Q

electrostatic force

A

the force acting between two charged forces

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5
Q

magnetic force

A

the force between two magnets, or a magnet and a magnet material

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6
Q

non-contact force

A

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

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7
Q

water resistance

A

the force of an object moving through water that causes it to slow down

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8
Q

newton (N)

A

the unit of force, symbol N

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9
Q

weight

A

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

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10
Q

newton meter

A

a piece of equipment used to measure weight in newtons

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11
Q

Hooke’s law

A

a law (invented by Robert Hooke) that says if you double the force on an object the extension will double

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12
Q

kilogram (kg)

A

the unit of mass, symbol kg

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13
Q

deform

A

to change shape (e.g a spring)

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14
Q

friction

A

the force that resists movement because of contact between surfaces (e.g when a car brakes)

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15
Q

reaction force

A

the support force provided by a solid surface (like a floor)

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16
Q

streamlined

A

shaped to reduce resistance to motion from air or water

17
Q

compress

A

to squash into a smaller space

18
Q

balanced forces

A

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

19
Q

extension

A

the amount by which an object gets longer when a force is applied. work it out by NEW LENGTH - ORIGINAL LENGTH

20
Q

density

A

work it out by MASS/VOLUME

21
Q

gradient

A

the slope of a graph. the steeper the gradient, the faster it goes. the gradient of a line in a distance-time graph equals the speed

22
Q

average speed

A

work it out by TOTAL DISTANCE/ TOTAL TIME

23
Q

vector quantity

A

they have a size and direction

24
Q

equilibrium

A

balanced

25
Q

tension

A

a stretching force

26
Q

elastic limit

A

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

27
Q

gravity

A

a non-contact force that acts between two masses

28
Q

lubrication

A

a substance that reduces friction between surfaces when they rub together

forces revision (1 decks)

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