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3.3 Optional application 1 – mechanics

3.3.1 MA: Dimensional analysis

 
Content
MA1
Finding dimensions of quantities; checking for dimensional consistency.
 
Content
MA2
Prediction of formulae; finding powers in potential formulae.

3.3.2 MB: Momentum and collisions

 
Content
MB1
Conservation of momentum for linear motion and cases where velocities are given as one or two dimensional vectors (problems which require resolving).
 
Content
MB2
Coefficient of restitution and Newton’s Experimental Law. Use in direct collisions and impacts with a fixed smooth surface. Problems which require resolving.
 
Content
MB3
Impulse and its relation to momentum. Use of
Ft=mv-mu
. Problems which require resolving.
 
Content
MB4
Impulse for variable forces. One dimension only. Use of
I=Fdt
.

3.3.3 MC: Work, energy and power

 
Content
MC1
Work done by a force acting in the direction of motion or directly opposing the motion. Use of
WD=Fd cosθ
 
Content
MC2
Gravitational potential energy. Use in conservation of energy problems.
 
Content
MC3
Kinetic energy. Use in conservation of energy problems.
 
Content
MC4

Hooke’s Law including using modulus of elasticity.

Use of

T=kx
or
T=λlx

 
Content
MC5

Work done by a variable force. Use of

WD=Fdx
.

Use in conservation of energy problems.

 
Content
MC6

Elastic potential energy using modulus of elasticity. Use of

EPE=kx22
and
EPE=λx22l
.

Use in conservation of energy problems.

3.3.4 MD: Circular motion

 
Content
MD1

Motion of a particle moving in a circle with constant speed (knowledge of radians assumed).

 
Content
MD2

Understand the definition of angular speed.

Use both radians and revolutions per unit time.

 
Content
MD3
Relationships between speed, angular speed, radius and acceleration. Use of
v=rω
,
a=rω2
and
a=v2r
 
Content
MD4
Use position, velocity and acceleration as vectors in the context of circular motion.
 
Content
MD5
Conical pendulum, with one or two strings.
 
Content
MD6
Circular motion in a vertical plane. Includes conditions to complete vertical circles. Use of conservation of energy in this context.

3.3.5 ME: Centres of mass and moments

 
Content
ME1
Centre of mass for a system of particles.
 
Content
ME2
Centre of mass for a composite body.
 
Content
ME3
Centre of mass of a lamina by integration.
 
Content
ME4
Centres of mass of bodies formed by rotating a region about the
x
-axis.
 
Content
ME5
Conditions for sliding and toppling. Problems including suspension and on an inclined plane.
 
Content
ME6
Determine the forces acting on a rigid body in equilibrium. Use of moments and couples.