P1 Fc Before Exam Flashcards

1
Q

Give an equation linking spring constant and frequency

A

F= 1/2pi x square root of(k/m)

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2
Q

Give an equation for energy using Amplitude and spring constant

A

E=1/2 x K x A^2

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3
Q

Explain why an astronaut feels weightless in a space vehicle

A

Because the astronaut in the space vehicle are travelling at the same speed and there is no normal reaction force between the astronaut and the space vehicles floor

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4
Q

What mechanisms can we use to have an accurate experiment for determining acceleration of free fall

A

Using a trapdoor
And an electromagnet and light gates

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5
Q

What is drag

A

The frictional force for an object travelling through a fluid

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6
Q

Definition for centre of mass

A

A single point of an object that the whole weight is considered to act through

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7
Q

Describe the velocity against time graph for terminal velocity /when an object reaches maximum velocity

A

A decreasing gradient from 0 which flattens out

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8
Q

Describe the acceleration against time graph for terminal velocity

A

Acceleration at max when t=0 this decreases exponentially and reaches 0

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9
Q

When will an object float in a liquid

A

When the object has a lower density than the fluid

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10
Q

Definition for upthrust

A

The weight of fluid displaced by an object when it is submerged

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11
Q

State archimedes principle

A

When a body is partially or fully submerged in a fluid it will experience an upthrust equal to the weight of fluid it has displaced

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12
Q

State principle of moments

A

The sum of the acw moments = the sum of the cw moments

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13
Q

What is a couple

A

A pair of forces of equal size which act parallel to eachother but in the opposite direction

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14
Q

Def for moment and torque

A

Moment = the force times the perpendicular distance from the pivot to the line of action of the once
Torque= the size of one of the forces in a couple x the perpendicular distance between the forces

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15
Q

Def for work done

A

The force causing motion x the distance moved in that direction

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16
Q

How can we find the work done from a force extension graph

A

Work done = area under force-extension graph
Work done = elastic potential energy

17
Q

What is the area under a stress-strain graph

A

Gradient = young modulus
Are = elastic potential energy per unit volume

18
Q

Give equation for impulse

A

Impulse= change of momentum
Impulse= f x change in time

19
Q

What is the area under under a force time graph equal to

A

Impulse ( change in momentum)

20
Q

What is conserved in elastic and in elastic collisions

A

Elastic- KE and momentum
In elastic - momentum

21
Q

State Newton’s second law

A

The resultant force is directly proportional to the rate of change of momentum

22
Q

State newtons 1st law

A

An object will remain in equillibrium unless a resultant force acts on the object

23
Q

How is the absolute temp scale different to the Celsius scale

A

It does not depend on the property of any specific material , Celsius scale uses the boiling and freezing points of water

24
Q

Explain the structure of a gas liquid and solid

A

Gas- particles are free to move around with constant random motion no forces of attraction between particles
Liquid- particles constantly moving and free to move past eachother but are attracted to eachother
Solid- particles vibrate about fixed positions held by strong attractive forces

25
Q

Explain thermal equillibrium

A

Thermal energy is transferred from a higher temp to regions of lower temp until all regions are in equillibrium

26
Q

Def of specific heat capacity

A

The amount of energy needed to raise the temp of 1kg of substance by 1 K

27
Q

State Keplers three rules

A

The first law states that each planet move in an elliptical orbit around the Sun with the sun at one focus
The second law states that a line segment joining the Sun to a planet will sweep out equal areas and equal time segments
The third law states that the period of the orbit and the main distance between the Sun and the planet are related by T squared is proportional to radius cubed

28
Q

Mason is a spacecraft which orbits Mars an error stationary orbit for Mars is the equivalent of a Geo stationary orbit for us explain why maven would not be placed in an arrow stationary orbit where the average distance from the centre of Mars is 20,000 km

A

Maven needs to be within the atmosphere of Mars therefore cannot be far away. This is to be able to see the whole planet and not just the atmosphere.

29
Q

Define specific latent heat of fusion

A

The energy required per unit mass to change the state of a substance from a solid to a liquid without changing its temperature

30
Q

How do you find the ratio of speed with two moving objects?

A

Find the ratio of the distance moved by the two objects

31
Q

Give an equation for root means square speed using the molar mass of one molecule, you are not given the mass of the substance

A

1/2 M C^2=3/2 R T

32
Q

A loudspeaker is mounted on a bench and produces sound waves at a certain frequency and has a microphone receiving the sideways. Explain what type of motion this is an example of.

A

Simple harmonic motion

33
Q

State one property of a black hole

A

It is infinitely dense