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Physics AS > C4 > Flashcards

C4 Flashcards

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1
Q

Mass of object

A

physical property - depends on amount of matter object contains

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2
Q

Net force

A

Net force acting on an object makes object accelerate in the direction of the force

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3
Q

equation relating force, mass and acc

A

F=ma

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4
Q

mass vs weight

A

mass remains constant everywhere but weight changes depending on location

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5
Q

equation relating w, m and g

A

W=mg

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6
Q

g on Earth

A

9.81 ms^-2

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7
Q

how to measure weight

A

using a newtonmeter, use on different planets

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8
Q

Centre of mass

A

Centre of mass of an object - point through object which any externally applied force produces straight line motion but no rotation

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9
Q

Centre of gravity

A

A single point throguh which resultant force of whole object acts through

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10
Q

Weight

A

Gravitational force acting on an object through its centre of mass

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11
Q

Friction

A

The force that arises when two surfaces rub against each other

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12
Q

Drag

A

The resistive force on an object travelling through a fluid e.g. air or water (like friction)

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13
Q

Tension

A

the force within a stretched cable / rope/ object

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14
Q

upthrust

A

an upward buoyancy force acting on an object when it is in a fluid

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15
Q

normal contact force

A

a force arising when one object rests against another object

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16
Q

Factors affecting magnitude of drag force

A

shape of object
roughness of object
density of object it is moving through
speed of object

17
Q

common relationship between drag force and speed

A

drag force is directly proportional to speed 2

18
Q

Terminal velocity

A

when drag force is equal to weight

acceleration is 0

19
Q

investigating motion in a fluid practical

A

-drop a ball bearing into a fluid
to record velocity:
use motion sensor connected to a data logger
OR
use stopcock and ruler to determine velocity at regular intervals using v = s/t

-plot v-t graph and analyse results

Physics AS (10 decks)

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