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Physics > Forces and motion > Flashcards

Forces and motion Flashcards

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1
Q

what is speed defined as?

A

distance travelled per unit time

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2
Q

calculation of average speed with total time and total distance

A

average speed = total distance/ total time

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3
Q

What is velocity?

A

speed in a given direction

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4
Q

what is acceleration?

A

change in velocity per unit time

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5
Q

speed in a given direction is described as…

A

velocity

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6
Q

change in velocity per unit time is described as…

A

acceleration

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7
Q

distance travelled per unit time is described as…

A

speed

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8
Q

calculation of acceleration when theres a change in velocity and time taken

A

change in velocity/ time taken

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9
Q

a vector has (2)…

A

magnitude and direction

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10
Q

a scalar has a…

A

magnitude

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11
Q

examples of scalars (4)

A
  • distance
  • speed
  • time
  • energy
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12
Q

examples of vectors (4)

A
  • displacement
  • velocity
  • acceleration
  • force
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13
Q

forces can change (3)

A

speed, shape or direction

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14
Q

force is measured in?

A

Newtons (N)

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15
Q

newtons first law

A

an object has a constant velocity unless acted on by resultant force

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16
Q

newtons second law

A

force = mass x acceleration

17
Q

newtons third law

A

states every action force has equal and opposite reaction force

18
Q

example of newtons third law

A

force of the earths gravity on an object is equal and opposite to the force of the object gravity on earth

19
Q

calculation for weight when mass and gravitational field strength are involved

A

weight = mass x gravitational field strength

20
Q

what is the gravitational field strength on earth?

A

10N/kg

21
Q

slower reaction times are due to

A

alcohol, tiredness or distraction

22
Q

faster reaction time are due to

A

breaks working, thinking time and caffeine

23
Q

Hooke’s law

A

F = kx

24
Q

linear

A

straight line graph.

25
Q

non- linear

A

curved line

26
Q

equation for moment

A

moment = force x perpendicular distance from the pivot

27
Q

sum of clockwise moments is equal to…

A

the sum of anticlockwise moments and there is no resultant force

28
Q

momentum of an object is the product of its mass and velocity calculation

A

momentum = mass x velocity

29
Q

force exerted on an object is equal to…

A

its change in momentum over time

30
Q

in a collision, the total momentum before is equal to…

A

total momentum afterwards

31
Q

force calculation when change in momentum and time tskrn sre involved?

A

change in momentum/ time taken

32
Q

principle of the conservation of momentum is…

A

total momentum before = total momentum afterwards

Physics (8 decks)

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