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Physics > C4 Forces In Action > Flashcards

C4 Forces In Action Flashcards

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1
Q

What does a resultant/ net force on an object do

A

The object will accelerate in the direction the force is being applied

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2
Q

Standard equation for force

A

F = ma

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3
Q

What is weight

A

The gravitational force acting on an object

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4
Q

Acceleration of free fall on the moon?

A

1.6ms^-2

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5
Q

What is the centre of mass

A

A point where any externally applied force only produces straight line motion and no rotation

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6
Q

Friction definition

A

The force that arises when two surfaces rub against each other

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7
Q

Drag def

A

The resistive force on an object travelling through a fluid

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8
Q

Tension def

A

The force within a stretched cable or rope

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9
Q

Upthrust

A

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

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10
Q

Normal contact force

A

A force arising when one object rests against anither object

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11
Q

What does an object moving throigh a fluid always experience naturally

A

A drag force

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12
Q

Most prominent factors that effect drag force on an object

A

The objects speed and cross-sectional area

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13
Q

What is drag force proportional to?

A

Drag force is directly proportional to velocity ^2

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14
Q

Moment of a force definition

A

The moment of a force is the turning affect of a force about an axis or a point

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15
Q

What distance must be used in moment calculations

A

Perpendicular distance

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16
Q

Principal of moments

A

For a body to be in rotational equilibrium, the sum of the anticlockwise moments about any point is equal to the sum of the clockwise moments about that same point

17
Q

Torque of a couple equation

A

Torque = one of the forces*perpendicular seperation between the forces

18
Q

Density definitin

A

Mass per unit volume

19
Q

Pressure definition

A

The normal force excerted per unit area

20
Q

What are fluids

A

Substances that can flow

21
Q

Pressure caused by a column of liquid

A

Pressure = height of a columndensity of a liquidacceleration of free fall

22
Q

Unique feature of fluid pressure

A

The pressure in a fluid at any particular depth is the same in all directions

23
Q

What is archimedies principle

A

The upthrust excerted on a fluid, whether partially or fully submerged, is equal to the weight of the fluid that the body displaces

Physics (12 decks)

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