Mod2 Flashcards by Oisin Tyrrell

Stress equation?

Force ÷ CSA

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Strain EQ

Extension ÷ original length

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Pressure

Force ÷ area

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Acceleration

Final Velocity - Initial velocity ÷ period of time

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Gravitation

F = (m1)(m2) ÷ r²

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Coming to Earth

= X ( G ) -1G force

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Leaving Earth

= X ( G ) + 1 G force

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Horizontal G Force

= X ( G )

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Mechanical Advantage

Load ÷ effort

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Velocity ratio

Distance moved by effort ÷ distance moved by load

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Efficiency

Force Ratio ÷ Movement Ratio X 100

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Work

Force X Distance

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Power / Work per second

Force X Distance

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Total Energy

PE + KE

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Potential Energy

Weight X Height

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Kinetic Energy

1/2 (mass x velocity)²

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Momentum

Mass X Velocity

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Coefficient of Friction

Frictional Force ÷ Load

Density

Mass ÷ Volume

Relative Density / SG

Density of material ÷ density of water

The hydrogen atom contains

A No Protons or neutrons

B One proton, no neutrons and one electron

C Two electrons one neutron and two protons

B One proton, no neutrons and one electron

Which of the following is TRUE

A The number of protons in an atom defines which element it is

B The number of electrons in an atom defines which element it is

C The number of neutrons in an atom defines which element it is

A The number of protons in an atom defines which element it is

If you keep lowering the pressure acting on the surface of water

A. There will be no change

B. It will eventually change to steam and boil

C. It will solidify and freeze

B. It will eventually change to steam and boil

A watt is

A. Equal to 1 joule per second

B. Equal to 1 joule per minute

C. Equal to distance x 1 joule per second

A. Equal to 1 joule per second

The Law of conservation of momentum states that if no external force acts on a system of colliding bodies A. The total momentum of the bodies varies B. The total momentum of the bodies remains constant C. The total momentum of the bodies are in equilibrium and vary

B. The total momentum of the bodies remains constant

Gyroscopic rigidity conforms to A. Newton’s fourth law B. Newton’s third law C. Newton’s first law

C. Newton’s first law

Which of the following statements is CORRECT A. Friction depends on the nature, viscosity and density of the substance in contact B. The differences of friction between similar materials are indicated by a factor known as resistance of friction C. Friction depends on the nature of the materials in contact

C. Friction depends on the nature of the materials in contact

Examples of chemical energy are A. Burning oil or wood B. Friction or compression of gasses C. All of the above

A. Burning oil or wood

Whenever the bulb of a thermometer is placed in a bowl of melting ice A. The liquid in the tube of the thermometer will always go to the same level B. The liquid in the tube of the thermometer will always vary C. The liquid in the tube of the thermometer will oscillate between 0 degrees Celsius and 2 degrees Celsius

A. The liquid in the tube of the thermometer will always go to the same level

Water that is NOT pure A. Freezes at lower temperature B. Freezes at higher temperature C. Freezes exactly the same as pure water

A. Freezes at lower temperature

A body is said to accelerate when A. Speed changes B. Velocity changes C. It has foreword momentum

B. Velocity changes

The equation of motion is A. V = U + at B. S = U + at xF C. There is no equation of motion

A. V = U + at

The size of the gravitational force attracting 2 objects together is A. Proportional to the product of their masses ² B. Inversely proportional to the product of their masses C. Directly proportional to the product of their masses

C. Directly proportional to the product of their masses

Harmonics are the frequencies which A. Are multiples of the fundamental frequency B. Are naturally occurring in the northern hemisphere only C. Are responses to bodies of vibration of its own natural frequency

A. Are multiples of the fundamental frequency

The force due to the tension of the chord that acts inward and along a line A. Is called centrifugal force B. Is called centripetal force C. Is called dynamic braking force

B. Is called centripetal force

If a body is moving in an orbit, the time it will take for one complete revolution is called A. Pendulum related time inversed B. Gravitation pull time C. The periodic time

C. The periodic time

The toxicity of a substance refers to how A. Poisonous it is B. Viscous it is C. Flammable it is

A. Poisonous it is

A ductile material can A. Cannot be stretched into new shapes B. Be stretched into new shapes but pull apart easily C. Be stretched into new shapes without pulling apart

C. Be stretched into new shapes without pulling apart

Which of the following statements is TRUE A. Gasses differ in their relative densities B. Gasses have the same relative densities C. Gasses, as they are not liquid, do not have a relative density

A. Gasses differ in their relative densities

The viscosity of a liquid varies inversely with temperature and the viscosity of a gas A. Varies inversely with temperature also B. Varies directly with temperature C. The statement is incorrect. The viscosity of a liquid varies directly with temperature

B. Varies directly with temperature

When the flow rate is constant, the velocity of a flowing fluid A. Varies directly with the cross sectional area² B. Varies directly with the cross sectional area C. Varies inversely with the cross sectional area

C. Varies inversely with the cross sectional area

A volatile liquid is one which A. Requires a heat source before it will evaporate B. Will not evaporate at normal temperature C. Readily evaporates at normal temperature

C. Readily evaporates at normal temperature

A body partially or fully immersed in a liquid or gas weighs A. Less than it does in free space B. More than it does in free space C. Same as it does in free space

A. Less than it does in free space

When we say that a given engine has a 30% efficiency we mean that only A. 30% of the potential energy in the fuel is converted to work B. 30% of the kinetic energy in the fuel is converted to work C. 30% of the engine is at work presently and there is a potential to use another 70% later on

A. 30% of the potential energy in the fuel is converted to work