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Physics > Forces and Motion > Flashcards

Forces and Motion Flashcards

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0
Q

What the equation for speed?

A

Distance divided by time

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1
Q

What is the difference between speed and velocity?

A

Speed - how fast

Velocity - direction specified

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2
Q

What is the equation for acceleration?

A

Change in velocity divided by time

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3
Q 
On a distance time graph what is the
Gradient
Flat section
Downhill
Curves
A

Speed
Stopped
Going back to starting point
Acceleration

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4
Q 
On a velocity time graph what is the 
Gradient
Flat section
Uphill
Downhill
Curve 
Area
A 
Acceleration 
Steady speed
Acceleration 
Deceleration 
Changing acceleration 
Distance
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5
Q

What is gravity?

A

The force attraction between all masses

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6
Q

What is the difference between weight and mass?

A

Mass - amount of stuff

Weight - different in each planet, mass with gravity

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7
Q

What is the equation of weight?

A

Mass x gravitational field strength

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8
Q

What are the 7 types of force?

A 
Gravity 
Reaction force 
Electrostatic force
Thrust, push or pull
Drag, air resistance, friction
Lift
Tension
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9
Q

What does friction do?

A

Opposes motion of the object - slows down

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10
Q

What 3 ways does friction occur?

A

Friction between solid surfaces gripping and sliding past each other
Resistance or drag from fluids

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11
Q

Friction increases as the ………………….

A

Speed increase

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12
Q

What is terminal velocity?

A

Maximum velocity

When the resistance force is equal to the accelerating force

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13
Q

The terminal velocity depends on ……………..

A

Their shape and area

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14
Q

What is the first law of motion?

A

If forces are balanced it will stay still unless moving and will stay the same velocity

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15
Q

What is the second law of motion?

A

If there is a unbalanced force then the object will accelerate in that direction

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16
Q

What is the equation for force?

A

Mass x acceleration

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17
Q

What is the third law of motion?

A

If object A exerts a force on object B exerts the exact opposite force on object a
Momentum before collisions is equal to momentum after

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18
Q

What is a vector and scalar quantity?give examples

A

Vector - size and direction , force velocity acceleration

Scalar - only size , speed, time, length

19
Q

What is thinking distance affected by?

A

How fast

Alcohol, tiredness, drugs

20
Q

What affects breaking distance?

A

How fast
Mass of be vehicle
Brakes
Grip

21
Q

What is the equation for momentum?

A

Mass x velocity

22
Q

Momentum before =

A

Momentum after

23
Q

What is the equation of force acting?

A

Change in momentum divided by time taken for change

24
Q

What is the equation for moments?

A

Moment=force x perpendicular distance from pivot

25
Q

Where does the centre of gravity hang?

A

Directly below the point of suspension

26
Q

If a object is balanced Total anti-clockwise moments =

A

Total clockwise moments

27
Q

If the moments are not equal there will be

A

A resultant force

28
Q

What is hookes law?

A

Extension is proportional to force

29
Q

What is the length of an I stretched metal wire called?

A

Natural length

30
Q

When does hookes law stop working?

A

When the force is great enough

31
Q

What is the universe?

A

A large collection of billions of galaxies

32
Q

What causes orbit?

A

Gravity

33
Q

How do comets orbit the sun?

A

Elliptical with sun at the focus

34
Q

When does a comet travel faster?

A

By the sun

35
Q

What are the different types of forces?

A 
Gravitational
Reaction
Electrostatic
Thrust (push / pull)
Lift
Tension
Air resistance
Water resistance
36
Q

What is the difference between vector and scalar quantities?

A

A scalar has a magnitude of size only e.g. Speed 10m/s

A vector has a magnitude of size and direction e.g. Velocity 10m/s East / force 50N left

37
Q

Is force a vector or scalar quantity?

A

Vector

38
Q

What is friction?

A

A force that opposes motion

39
Q

What is the equation for the relationship between force, mass and acceleration?

A

Force = mass x acceleration

40
Q

What is the equation for the relationship between speed, distance and time?

A

Speed = distance / time

41
Q

What is the equation for the relationship between acceleration, change in velocity and time?

A

Acceleration = change in velocity / time

42
Q

What is the equation for the relationship between momentum, mass and velocity?

A

Momentum = mass x velocity

43
Q

What is the equation for the relationship between moment, force and distance?

A

Moment = force x perpendicular distance to pivot

44
Q

What is the area under a distance time graph?

IGNORE

A

The speed

Physics (8 decks)

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