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Unit 3 - Matter
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Presentation on Collisions (Physics Cambridge AS/A-level Course)
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AS LEVELPHYSICS
,5 Forces, density and pressure ............................... 3
5.1 Types of force .............................................................3
Moving through fluids ..................................................4
5.2 Turning effects of forces ...............................................6
Turning effect of a force ...............................................6
5.3 Equilibrium of forces ....................................................8
5.4 Density and pressure ...................................................9
6 Work, energy and power ..................................12
6.1 Energy conversion and conservation ...........................12
6.2 Work and efficiency ...................................................13
Doing work, transferring energy .................................14
Energy transfers .........................................................17
6.3 Potential energy and kinetic energy ............................18
Kinetic energy ...........................................................18
Down, up, down - energy changes ..............................19
Gravitational potential energy....................................20
6.4 Power .......................................................................20
Power .......................................................................20
9 Deformation of solids.........................................23
9.1 Stress and strain ........................................................23
Compressive and tensile forces ...................................23
Stretching materials ...................................................24
9.2 Elastic and plastic behaviour ......................................27
Elastic potential energy ..............................................27
, 5 FORCES, DENSIT
AND PRESSURE
In this topic, the natures of some different types of force are studied, includ
give rise to both translational and rotational equilibrium.
The concept of pressure is introduced. This acts as a starting point for later
pressure in gases.
5 .1 T Y P E S O F F O R C
LEARNING OUTCOMES
C ANDIDATES SHOULD BE ABLE TO:
A. describe the force on a mass in a uniform gravitational field and on a c
uniform electric field
- Force on a mass in a uniform gravitational field: a region of space in w
experiences an (attractive) force due to the presence of another mass.
- Force on a charge in a uniform electric field: a region of space where a
experiences an (attractive or repulsive) force due to the presence of anoth
B. understand the origin of the upthrust acting on a body in a fluid
- Any object placed in a fluid such as water or air experiences an upwards fo
what makes it possible for something to float in water.
- Upthrust arises from the pressure which a fluid exerts on an object; the de
greater the pressure. So there’s more pressure on the lower surface of an o
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