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GCSE Physics > General Physics (Forces, Pressure etc) > Flashcards

General Physics (Forces, Pressure etc) Flashcards

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1
Q

What is pressure the result of?

A

A force acting on an area

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2
Q

What is the equation for pressure?

A

P=F/A

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3
Q

What are the units for pressure?

A

N/m^2 or Pascal

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4
Q

Give 2 examples of pressure in everyday life

A

Clicking a button

Walking, as your shoes apply pressure to the ground

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5
Q

How would you get a small pressure?

A

Spread the force over a large area

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6
Q

How would you get a large pressure?

A

Spread the force on a small, concentrated area

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7
Q

Does pressure increase or decrease with depth?

A

Increase

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8
Q

What direction does pressure act in?

A

All directions

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9
Q

What angle does pressure act at?

A

Right angles (90o)

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10
Q

Why do liquids transmit pressure?

A

Because their molecules are free to move about

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11
Q

What is another equation for pressure? (Think boats)

A

P=hgp (P is pressure, h is height from surface, g is gravitational potential and p is density of the liquid

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12
Q

Give 2 examples of where a hydraulic jack is used

A

1) Trolley jack

2) Earth mover

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13
Q

What does the moment (turning effect) of a force rely on?

A

It’s size and position

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14
Q

What is the equation for moments?

A

Distance x force = moment

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15
Q

What is the unit for moments?

A

NewtonMetres (Nm)

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16
Q

What does the principal for moments state?

A

Clockwise moments = anti-clockwise moments

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17
Q

What can moments of a force be increased by?

A

-increasing force applied

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18
Q

What is the weight of an object called?

A

The Load

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19
Q

What is the force someone applies called?

A

The effort

20
Q

What are other terms for the turning point?

A

The pivot or the fulcrum

21
Q

What are some examples of energy?

A

Chemical, kinetic, gravitational potential, elastic potential, electrical, thermal, light, sound and nuclear,

22
Q

What is work?

A

A quantity involving a force moving through a distance

23
Q

What is the equation for work done?

A

Force x distance = work done

24
Q

What unit is work measured in?

A

Joules

25
Q

What is energy?

A

The ability to do work

26
Q

What is gravitational potential energy?

A

The energy an object has due to it’s position above earth

27
Q

What is the equation for gravitational potential energy?

A

GPE = m x g x h

28
Q

What is kinetic energy?

A

The energy an object has due to it’s movement

29
Q

What is the equation for kinetic energy?

A

KE = 0.5mv^2 (m is mass, v is velocity)

30
Q

What is elastic potential energy?

A

The energy an object has because of it’s change in shape or displacement of it’s molecules

31
Q

What does Hooke’s Law state?

A

As you add weights onto a spring, the spring will extend by and equal length each time a new weight is added on

32
Q

What does the Law of the Conservation of Energy state?

A

Energy can neither be created nor destroyed, it can ONLY be transferred into other forms

33
Q

Give some examples of energy transfers

A
  • A torch, chemical energy gets converted to electrical energy which then transfers to heat and light energy
  • A pendulum, GPE to KE to GPE to KE to GPE and so on
34
Q

What is power?

A

The rate of doing work or transferring energy

35
Q

What is the equation for power?

A

Power = work done/time taken

36
Q

What are the units for power?

A

Watts

37
Q

What is efficiency?

A

How useful/unuseful an energy transfer is

38
Q

What is the equation for efficiency?

A

(Useful output/total input) x100

39
Q

What is the equation for momentum?

A

M = kg x m/s

40
Q

What is the conservation of momentum?

A

Momentum before = momentum after

41
Q

What is another equation for force?

A

F=M x DeltaV/T

42
Q

What is centripetal force?

A

A circular motion of an object around a point

43
Q

When does centripetal force take place?

A

When the speed is constant

44
Q

What is Boyle’s law?

A

Pressure and volume before = pressure and volume after

45
Q

What is Brownian Motion?

A

The random ‘jiggling’ or motion of small particles

GCSE Physics (4 decks)

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