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A Level Physics > C4 (Forces in Action) > Flashcards

C4 (Forces in Action) Flashcards

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1
Q

What does the mass of an object depend on

A

Amount of matter it cotains

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2
Q

A net force acting on the object will make the object will make it…

A

Accelerate if the direction of the net force

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3
Q

Equation for resultant force

A

F=ma

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4
Q

Equation for weight

A

W=mg

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5
Q

Where would the resultant force on the object (it’s total weight) will act through a point often called…

A

The objects centre of gravity

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6
Q

Why do we use the centre of mass

A

Much easier to analyse and solve physics problems

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7
Q

How do you find the centre of gravity

A

Using a plumb line

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8
Q

Weight

A

The gravitational force acting on an object through its centre of mass

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9
Q

Friction

A

The force that arises when two surfaces rub against each other

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10
Q

Drag

A

The resistive force on an object travelling through a liquid, the same as friction

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11
Q

Tension

A

The force within a stretched cable or rope

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12
Q

Normal contact force

A

A force arising when one object rests against another object

Normal means at a right angle too

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13
Q

Assuming there’s no friction what’s the only force acting on an object

A

It’s weight

Which can be resolved into two components, parallel and perpendicular to the slope.

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14
Q

An object moving through an object experiences what

A

Drag

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15
Q

Drags magnitude depends on several factors…

A

Speed of object
Shape of object
Roughness and texture
Density of the fluid through which it travels
Most important factors are it’s speed and cross sectional area

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16
Q

What is drag directly proportional to?

A

Speed^2

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17
Q

What does having a vehicle that’s more smooth and streamline permit

A

Increase top speed and reduces the amount of fuel used on a journey

18
Q

Terminal velocity

A

When the drag force on the object is equal and opposite to it’s weight . At terminal velocity the object has zero acceleration and it’s speed is constant.

19
Q

Moment of a force

A

The turing effect of a force about some axis or point

20
Q

Moment equation

A

Moment= force x perpendicular distance of the line of action form the axis/point of rotation

21
Q

The principal of moments

A

When body is in equilibrium the net force and it’s net moment is 0.
For a body in rotational equilibrium, the sum of the anticlockwise moments about any point is equal to the sum of the clockwise moments about the same point.

22
Q

Torque of a couple

A

One of the forces x perpendicular separation between the forces
=Fd

23
Q

Torque

A

A moment of a couple

24
Q

Couple

A

Two forces that must be parallel and along different lines.

25
Q

How can forces in equilibrium be drawn

A

Triangle of forces ( an enclosed triangle as the forces are in equilibrium)

26
Q

Density

A

Mass per unit of volume

Density=m/v

27
Q

Pressure equation

A

Pressure = Force/ Area

28
Q

What are fluids

A

Substances that can flow

29
Q

How to calculate pressure exerted by a vertical column of any liquid

A

p= height x density x gravitational potential

30
Q

The pressure in a fluid at any particular depth has an unusual feature are

A

It is the same in all directions

31
Q

Upthrust is based on what

A

Pressure difference

32
Q

Archimedes principle

A

The upthrust exerted on a body immersed in a fluid, wether fully or partially submerged, is equal to the weight of the fluid that the body displaces

33
Q

When will an object sink

A

If the upthrust is less than the weight of the object

34
Q

Density

A

Is the mass per unit volume

35
Q

Pressure

A

Is the force per unit area

36
Q

2 equations for pressure

A

P=F/A

P=hpg

37
Q

Upthrust

A

An upward force that fluids excerpt on objects that are partially or fully submerged in the fluid. Occurs because of the pressure difference between the top and bottom of the object.

38
Q

Upthrust is equal to…

A

The weight of the fluid displaced

39
Q

Archimedes’s principle

A

Says that when a body is completely or partially immersed it experiences an upthrust equal to the weight of the fluid it has displaced

40
Q

Power equation

A

Power= Force x Velocity

41
Q

Most car safety features are designed to slow you down gradually
Give some examples

A

Seat belts
Air bags
Crumple zones

A Level Physics (28 decks)

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