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mechanics Flashcards

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1
Q

what is meant by acceleration?

A

the rate of change of velocity in a given direction

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2
Q

is displacement a vector or a scalar quantity?

A

vector

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3
Q

is distance a vector or a scalar quantity?

A

scalar

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4
Q

is speed a vector or a scalar quantity?

A

scalar

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5
Q

is mass a vector or a scalar quantity?

A

scalar

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6
Q

is temperature a vector or a scalar quantity?

A

scalar

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7
Q

is velocity a vector or a scalar quantity?

A

vector

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8
Q

is force a vector or a scalar quantity?

A

vector

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9
Q

is weight a vector or a scalar quantity?

A

vector

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10
Q

is acceleration a vector or a scalar quantity?

A

vector

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11
Q

what is a couple?

A

when 2 parallel forces, equal in magnitude but opposite in direction, act to cause an object to rotate

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12
Q

what is meant by displacement?

A

the distance travelled in a particular direction

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13
Q

what is equillibrium?

A

when the sum of all the forces acting on an object is 0 as it has no resultant force

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14
Q

in a displacement-time graph, what does the gradient at any point equal to?

A

the instantaneous velocity at that time

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15
Q

in a velocity-time graph, what does the gradient at any point equal to?

A

the acceleration at that time

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16
Q

in a velocity-time graph, what does the area under equal to?

A

the displacement

17
Q

what is velocity?

A

the rate of change of displacement

18
Q

in an acceleration-time graph, what does the area under equal to?

A

the change in velocity

19
Q

what does SUVAT stand for?

A

s = displacement
u = initial velocity
v = final velocity
a = acceleration
t = time

20
Q

what is newton’s first law?

A

an object will remain in its current state of motion until it experiences a resultant force

21
Q

what is newton’s second law?

A

the rate of change of momentum of an object is proportional to the resultant force applied to it and is in the direction of the force

22
Q

what is newton’s third law?

A

whenever a force is exerted onto an object, an equal and opposite force is applied onto another object

23
Q

what is momentum?

A

the product of mass and velocity of an object

24
Q

what is a moment?

A

a turning force

25
Q

what is meant by the centre of mass?

A

the point where all the mass of an object acts

26
Q

when speed increases, does air resistant increase or decrease?

A

increase

27
Q

in projectile motion, what is the vertical acceleration equal to? (what units?)

A

gravitational field strength (g)

28
Q

what is meant by terminal velocity?

A

when the forces acting on the falling object become balanced, the acceleration becomes 0 and the object is moving at maximum velocity

29
Q

what is the difference between mass and weight?

A
  • mass is scalar, not dependent on the gravity acting upon it and measured in kilograms
  • weight is a vector, depends on the gravitational field strength and measured in newtons
30
Q

if an object is in equilibrium, what can you say about the object?

A

it is stationary or moving at a constant velocity

31
Q

what is meant by the principle of conservation of energy?

A

energy cant be created or destroyed, only transferred into other forms of energy

physics (3 decks)

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