Motion Flashcards

1
Q

What does Hooke’s law state

A

The force applied to an elastic material is directly proportional (straight line graph) to the extension

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2
Q

What is a limit of proporitonality

A

Where the x and y data is no longer proportional, so the graph is no longer proportional, in the case of a directly proportional (straight) graph, after the limit of proportionality is reached it becomes curved

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3
Q

What is an elastic limit and what does it apply to

A

A point where a spring is unable to return to its original shape, because it has been stretched too far. ONLY APPLIES FOR SPRINGS

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4
Q

Name something that is non-hookian

A

Elastic bands

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5
Q

What type of curve do elastic bands make when measuring force against extension

A

A hysteresis curve - the trends for loading and unloading are different

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6
Q

What graph does the extension of a spring and the force applied make

A

Directly proportional so a straight line from the origin

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7
Q

see the Hooke’s Law note to see what a hysteris curve looks like

A

Oj

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8
Q

What is the area under the loading line in a graph of an elastic band for force against extension

A

The total energy of the systme

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9
Q

What is the area under the unloading line in a hysteresis curve of an elastic band of force against extension

A

The useful energy of a system

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10
Q

What is the area between loading and unloading on a hysteresis curve of an elastic band where force is measured against extension

A

The thermal energy lost

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11
Q

For Hooke’s law, which variable is put on which axis

A

Force Y

Extension X

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12
Q

How can you do a practical to measure the extension of a spring vs the force applied

A
  1. Connect a spring to a clamp, then put a ruler on a lower clamp.
  2. Measure the length of the spring with no weight attached
  3. Put weights on the spring
  4. Measure the length of the spring
  5. Add more weight
  6. Repeat until you have around 10 data points
  7. Repeat the experiment for accuracy
  8. Calculate the extension for each data point - NEW LENGTH - ORIGINAL LENGTH
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13
Q

What is Newton’s first law

A

An object in motion will remain in motion unless acted on by another object. An object at rest will remain at rest unless acted on by another object

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14
Q

What is Newton’s second law

A

F = ma

If a resultant force acts on an object, then it will accelerate

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15
Q

What is Newton’s second law

A

F = ma

If a resultant force acts on an object, then it will accelerate

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16
Q

What is Newton’s third law

A

Every action has an equal and opposite reaction

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17
Q

When falling or rising in something like an elevator, do we get lighter or heavier and do we feel heavier or lighter

A

We feel lighter when falling and heavier when rising but actually our weight does not change

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18
Q

What is terminal velocity

A

The downwards force is the same as the upwards force, so there is no more acceleration. It is the maximum velocity an object can reach

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19
Q

What does terminal velocity depend on (2)

A
  1. Mass
  2. Surface area
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20
Q

How does a skydiver reach terminal velocity

A
  1. Jump out of plane - they start accelerating downwards because their weight is greater than the drag
  2. The increase in velocity causes the air resistance to increase, so acceleration decreases
  3. Eventually acceleration reaches zero because they are at a velocity where the force of their weight is the same as the force of the air resistance, so they are at terminal velocity.
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21
Q

What is resultant force

A

The overall force acting on an object, with forces in the same direction being added and forces in opposite direction being subtracted. If the resultant force is zero, the object doesn’t move but if it isn’t zero, it moves.

E.g. force left = 6N + 5N Force right = 9N

Resultant force = 2N left

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22
Q

What is a velocity time graph

A

Velocity y axis. X axis is in middle of y axis as velocity can be negative

23
Q

How do you do an experiment for f=ma

A
  1. Weigh the cart
  2. Set up an apparatus with a cart on a platform, a pulley at the end of the platform and a mass hanging off the platform.
  3. Pull the trolley back so the mass hangs just below the pulley
  4. Release the trolley, allowing it to accelerate. Make sure you stop it before it falls off because it is expensive
  5. Use software like SparkVue to calculate the acceleration
  6. Repeat steps 2-4 3 times
  7. Repeat steps 2-5 and continue until you have 10 different force and acceleration measurements
  8. Plot the data
24
Q

What is a vector and what is a scalar

A

Vector - direction and magnitude
Scalar - magnitude only

25
Q

What mass unit must you use

26
Q

What is the unit of weight

27
Q

What is a force that opposes motion

28
Q

What are some forms of friction

A

Water and air resistance

29
Q

What equation links work done, force and distance

A

Work done = force x distance

W=fd

30
Q

What is the equation for stopping distances

A

Thinking distance + braking distance = stopping distance

31
Q

What is thinking distance and what influences it

A

The distance travelled until a driver hits the brakes. Affected by distractions, alcohol/drugs, tiredness

32
Q

What is braking distance and what affects it

A

The distance taken for the brakes to take the speed of the car to zero. Affected by weather, tyres, friction and speed of the car

33
Q

What is the equation linking final velocity, initial velocity, acceleration and distance

A

V^2=U^2 + 2as

s = distance

34
Q

What is the area under a velocity/time graph

A

The displacement

35
Q

What is the orbital path of satellites (moons are types of satellite) and comets

A

Satellites - circular
Comets - eliptical

36
Q

What is the equation for orbital speed

A

Orbital speed = (2 x pi x orbital radius)/time

V = (2 pi r)/T

37
Q

When is the orbit of a comet fastest and when is it slowest

A

Fastest: at the closest point to the object it orbits
Slowest: at the furthest point from the object it orbits

38
Q

What is the relationship between the direction of vibration of particles and the direction of the movement of the wave in a longitudinal wave

A

They are parallel (the same direction) (L for paraLLeL)

39
Q

What is the relationship between the direction of the vibration of particles and the direction of the movement of the wave in a transverse wave

A

They are perpendicular

40
Q

What is the equation for wave speed and what are the units for each

A

V = f x λ

Speed (m/s) = frequency (Hz or 1/time) x wavelength (m)

41
Q

What does an oscilloscope do

A

Measures the frequency of the wave, displaying a graph for x axis time (be careful of units) and y axis voltage (measuring amplitude)

42
Q

What is the speed of light

A

3x10^8 m/s

43
Q

What is the speed of sound

A

330/340m/s

(Influenced by the air pressure, humidity, temperature etc)

44
Q

What can happen when a force is applied to an object (3)

A

The object can:
1. Change speed
2. Change size
3. Change direction

45
Q

What is the unit N/kg for

A

Gravitational field strength

46
Q

What is the unit kg m/s for

47
Q

What equation links speed, time and distance

A

Speed = distance/time

48
Q

What is the equation for acceleration

A

Accélération = change in VELOCITY/time taken

A = (v-u)/t

V = final velocity
U = initial velocity

49
Q

How do you determine acceleration from a velocity-time graph

A

The gradient

50
Q

How do you calculate the displacement (distance) from a velocity-time graph

A

The area under the graph

51
Q

Is a force needed to keep an object in motion

52
Q

What letters are used to represent speed, distance and time

A

Speed - v
Distance - s
Time - t

53
Q

What is the combined gas law equation

A

(P1V1)/T1 = (P2V2)/T2

TEMPERATURE MUST BE IN KELVIN

54
Q

What can you do in the combined gas laws equation if you have constant velocity, temperature or pressure