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Physics > P5 > Flashcards

P5 Flashcards

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1
Q

what is a force? (2)

A
  • a push or pull that acts on an object due to the interaction with another object
  • a vector with a size and direction
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2
Q

what do vector quantities have? What are some examples(5)?

A

magnitude and direction
- e.g forces, velocity, -displacement, acceleration, momentum etc

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3
Q

What do scalar quantities have?What are some examples(5)?

A

only magnitude (size)
- e.g - speed, distance, time, temp, mass, etc

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4
Q

what is displacement?

A

measures distance and direction in a straight line from an object’s starting point to it’s finishing point

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5
Q

what is the difference between mass and weight?

A
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6
Q

what is the difference between speed and velocity?

A

speed - how fast you’re going (e.g 30mph or 20m/s)
velocity - speed in a given direction (e.g 30mph, north or 20m/s , 060 degrees)

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7
Q

what is an interaction pair?

A

a pair of forces that are equal and opposite and act on 2 interaction objects

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8
Q

what are 5 examples of contact forces?

A
  1. friction
  2. air resistance
  3. normal contact force
  4. lift
  5. water resistance
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9
Q

what are 3 examples of non- contact forces?

A
  1. gravitational force
  2. magnetic force
  3. electrostatic force
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10
Q

what does the gravitational field strength (GFS) varie with?

A

with location
- GFS is stronger the closer you are to the mass causing the field and is stronger for larger masses

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11
Q

what does the weight of an object depend on?

A

the strength of the gravitational field at the location of the object

  • so weight of object changes with it’s location
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12
Q

what is used to measure weight?

A

a calibrated spring balance or newtonmeter

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13
Q

what is the resultant force?

A

the overall force on a point or object
Tne sum of all forces or overall force acting on an object.

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14
Q

what is needed for an object to stretch, compress or bend when a force is applied to it?

A

more than one force acting on it
- otherwise the object will only move in the direction of the applied force instead of changing shape

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15
Q

when is an object elastically deformed?

A

when it can revert to it’s original shape and length after the force has been removed

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16
Q

when is an object inelastically deformed?

A

when it can’t revert to it’s original shape and length after the force has been removed

17
Q

what is the extension of an elastic object directly proportional to?

A

the load or force applied

18
Q

What is limit of proportionality? n.d

A
19
Q

what are the typical speeds for theses everyday objects:
- person walking, running, cycling,
- a car, train and aeroplane.

A
  1. person walking - 1.5m/s
  2. person running - 3m/s
  3. person cycling - 6m/s
  4. car - 25 m/s
  5. train - 30 m/s
  6. plain - 250m/s
20
Q

what is the speed of sound in air? what is it varied by?

A

330 m/s
- varies on what sound waves are travelling through and speed of wind

21
Q

what factors affect wind speed? (3)

A
  1. temp
  2. atmospheric pressure
  3. large building/ structures nearby
22
Q

what is acceleration?

A

the change in velocity in a certain amount of time
- how quickly you speed up

23
Q

what is uniform acceleration?

A

speeding up/ slowing down at a constant rate
- constant acceleration

24
Q

What is drag?

A

the resistance you get in a fluid (liquid or gas)
- air resistance is a type of drag

25
Q

What is Hookes Law

A

A spring will always stretch by a proportional amount when force is increased
- however only applies to the elastic limit

26
Q

What name is given to the point at which the mass of an object may be considered to be concentrated?

A

centre of mass

27
Q

A single force can be resolved into two component forces that act at _____° angles to each other. What number completes the sentence?

A

90

28
Q

when an object moves in a circle the __________ of the object is continually changing. What is the missing word in this sentence?

A

velocity

29
Q

What is acceleration?

A

A change in velocity

30
Q

What is Newton’s first law of motion

A

If the resultant force acting on a stationary object is zero then the object will remain stationary.

If the resultant force acting on a moving is object zero, then the object will continue moving in the same direction at the same speed (with the same velocity)

31
Q

What is Newton’s second law of motion?

A

The acceleration of an objectis proportional to the resultant force acting on the object and inversely proportional to ne mass of the object.

32
Q

What is Newton’s third law of motion?

A

Whenever 2 objects interact the forces they exert on each other are equal and opposite

33
Q
A

Physics (8 decks)

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