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forces and motion > Forces and motion > Flashcards

Forces and motion Flashcards

1
Q

What is friction

A

Friction is a force that is created when two objects/surfaces rub together

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2
Q

Newtons first law

A

An object at rest will remain at rest unless acted on by an unbalanced force

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3
Q

Newtons second law

A

force equals mass times acceleration

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4
Q

Newtons third law

A

For every action, there is an equal and opposite reaction

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5
Q

What is drag

A

a drag is a force acting opposite to the relative motion

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6
Q

what is gravity

A

the force that attracts a body towards the center of the earth, or towards any other physical body having mass.

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7
Q

when is friction good and when is friction bad

A

good- to keep your car on the road, when walking, when playing rugby
bad- ice skating, the motor in your car, and when moving something produces heat

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8
Q

how do you calculate for speed

A

speed equals distance over time

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9
Q

how do you calculate for distance

A

distance equals speed times time

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10
Q

how do you calculate for time

A

time equals distance over speed

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11
Q

how do you find an average

A

add up all the data and divide by however many you added

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12
Q

what is mass

A

how much stuff something has

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13
Q

how is mass measured

A

in kgs

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14
Q

can mass change

A

no, mass remains constant

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15
Q

what is weight

A

weight is the force of gravity on a mass

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16
Q

how is weight measured

A

in newtons (N)

17
Q

can weight change

A

yes, weight changes depending on gravity

18
Q

how do you calculate weight/force

A

force equals mass times acceleration

19
Q

gravity on earth is measured at what

A

10ms-1

20
Q

a newton is how much

A

one newton is 10 kgs

21
Q

what is a pivot

A

fixed point around where the lever turns

22
Q

what is an effort

A

where applied by you

23
Q

what is a load

A

force you want to apply a force too

24
Q

what is the order of a 1st class lever

A

e,p,l or l,p,e

25
Q

what is the order of a 2nd class lever

A

p,l,e or e,l,p

26
Q

what is the order of a 3rd class lever

A

p,e,l or l,e,p

forces and motion (4 decks)

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