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Dynamics & Energy  Objectives
Content
• Centre of gravity
• Turning effects of forces
• Equilibrium of forces
• Force, mass and acceleration
• Work and Energy
• Power
• Motive power
Learning Outcomes
Candidates should be able to:

demonstrate an understanding that mass is the property of a body which resists change in motion.

recall and apply Newton's three laws of motion in appropriate situations.

recall and use the equation F = ma, in situations where mass is constant, appreciating that force and acceleration are always in the same direction.

construct and use freebody diagrams.

describe and use the concept of weight as the effect of a gravitational field on a mass

recall and use the relationship weight = mass x gravitational field strength.

understand that the weight of a body may be taken as acting at a single point known as its centre of gravity.

know that the position of the centre of gravity of a uniform regular solid is at its centre.

define the moment of a force about a point as the force x the perpendicular distance from the point to the line of action of the force.

understand a couple as a pair of equal and opposite coplanar forces tending to produce rotation only.

define the moment of a couple (torque) as the magnitude of one of the forces x the perpendicular distance between the lines of action of the forces.

undertand that, for an object in rotational equilibrium, the sum of the clockwise moments will equal the sum of the anticlockwise moments.

show an understanding that, when there is no resultant force and no resultant moment, a system is in equilibrium

apply the principle of moments to solve problems involving forces acting in two dimensions.

understand the concept of work in terms of the product of force and displacement in the direction of the force.

deal with quantitative and qualitative questions involving variable forces

appreciate the significance of the area under a forcedisplacement graph.

undestand that the work done is equal to the energy transferred.

recall and use the equation W = Fscosθ, where F is a constant force along the direction of motion.

recall and use equations for kinetic energy E_{k} = ½ mv^{2} and change in gravitational potential energy ΔE_{p} = mgΔh.

understand the principle of conservation of energy and apply it to examples involving kinetic energy, gravitational potential energy and work done against resistive forces.

relate power to work done and time taken.

recall and use the equation W = Pt.

recall and use the relationship motive power = driving force x speed.

calculate and express efficiency of a system as a number or percentage.
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