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phys > forces and motion 2 > Flashcards

forces and motion 2 Flashcards

1
Q

What is the SI unit for mass?

A

-Kg (kilograms)

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2
Q

What is the SI unit for distance?

A

-m (meters)

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3
Q

What is the SI unit for speed?

A

-m/s (metres per second)

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4
Q

What is the SI unit for acceleration?

A

-m/s2 (meters per second squared)

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5
Q

What is the SI unit for force?

A

-N (newtons)

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6
Q

What is the SI unit for time?

A

-s (seconds)

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7
Q

What is the SI unit for gravitational force constant?

A

-N/Kg (newtons per kilogram)

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8
Q

What is the SI unit for spring constant?

A

-N/m (newtons per meter)

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9
Q

What is newtons 2nd law?

A

-when there is a resultant force on a body it will accelerate

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10
Q

What is the equation for force?

A

FORCE = MASS X ACCELERATION

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11
Q

If there is a lefthand force of 200N on a car and a righthand force of 500N. Which way will the car go?

A
  • 300N to the right

- +300N

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12
Q

When there is a resultant force of 0. Which way is the car moving?

A

-it is stationary or constant velocity

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13
Q

What is weight?

A

-a downwards force caused by gravity

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14
Q

What is mass?

A

-the quantity of matter a body contains

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15
Q

What is the equation for weight?

A

WEIGHT = MASS X GRAVITATIONAL FORCE CONSTANT

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16
Q

If a box has a mass of 30Kg what is its weight?

A

30 x 10 = 300N

17
Q

The gravitational force constant on earth is …

A

-10N/Kg

18
Q

The acceleration of freefall on earth is …

A

-10m/s2

19
Q

What does drag do?

A

-Drag acts to OPPOSE the direction of motion

20
Q

What makes drag increase (2)?

A
  • as velocity increases

- as surface area increases

21
Q

What is terminal velocity?

A
  • when drag equals weight
  • once they are equal the resultant force on the object is 0 which means acceleration is 0 also so the falling object can’t go any faster!
22
Q

What is momentum?

A
  • the momentum of an object is the product of its mass and velocity
  • momentum is a vector
23
Q

What is the equation for momentum?

A

MOMENTUM = MASS X VELOCITY

24
Q

What is the change in momentum?

A

-change in momentum is final momentum - initial momentum

25
Q

A train mass of 20 tonnes is travelling along a straight track at 10m/s as it passes Salisbury station. As it exits the town, its velocity increases to 60m/s. Calculate the change in momentum of the train.

A

-final momentum is 20 tonnes x 60 =

NOT FINISHED

26
Q

What is the equation for force?

A

-force = change in momentum ÷ time taken

27
Q

What is the conservation of momentum?

A

-MOMENTUM BEFORE = MOMENTUM AFTER!!!!!!!!!!!

28
Q

Two snooker balls (mass=0.5Kg) collide.
Initially ball 1 is moving with velocity +5m/s
ball 2 is moving with velocity -1m/s
after collision ball 2 is moving with velocity +3m/s
What is the velocity of ball 1???

A

-mom. before
= (0.5(m) x 5(v)) + (0.5(m) x -1(v))
= 2.5+0.5 = 2Kgm/s

-mom. after(mom before)
= 2(mom)= (0.5(m) x v) + (0.5(m) x 3(v))  
= 2 = (0.5(m) x v) + 1.5 
= 2-1.5 = 0.5 x v (0.5 = 0.5 x v)
=  v = 1m/s
29
Q

What is stopping distance?

A

-thinking distance + braking distance

30
Q

Factors that affect braking distance?

A
  • the condition of tyres
  • mass of the vehicle
  • snowy/wet road
  • speed
  • driving downhill
31
Q

Factors that affect thinking distance?

A
  • drinking and other drugs
  • distracted by music or phone
  • tiredness
  • speed
32
Q

What are airbags used for?

A
  • to increase speed

- and hence reducing the force

33
Q

Where does weight act through in/ on a body?

A

The weight of the body acts through its centre of

gravity

34
Q

What is the equation for a moment(force of moment)?

A

-the force of moment = force x distance from pivot

phys (4 decks)

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