**Mechanics**

designed by Dr T. Marlow

## Specification:1. use the equations for uniformly accelerated motion in one dimension:
= v u + at s = ut + ½at^22 = v^ u^2 + 2as2 demonstrate an understanding of how ICT can be used to collect data for, and display, displacement/time and velocity/time graphs for uniformly accelerated motion and compare this with traditional methods in terms of reliability and validity of data. Determine speed and acceleration, for example use light gates 3 identify and use the physical quantities derived from the slopes and areas of displacement/time and velocity/time graphs, including cases of non-uniform acceleration 4 investigate, using primary data, recognise and make use of the independence of vertical and horizontal motion of a projectile moving freely under gravity. Understand using strobe photography or video camera to analyse motion 5 distinguish between scalar and vector quantities and give examples of each 6 resolve a vector into two components at right angles to each other by drawing and by calculation 7 combine two coplanar vectors at any angle to each other by drawing, and at right angles to each other by calculation 8 draw and interpret free-body force diagrams to represent forces on a particle or on an extended but rigid body, using the concept of centre of gravity of an extended body. Find the centre of gravity of an irregular rod9 investigate, by collecting primary data, and use Σ F = ma in situations where m is constant (Newton’s first law of motion ( a = 0) and second law of motion). Use an air track to investigatefactors affecting acceleration 10 use the expressions for gravitational field strength g = F/m and weight W = mg. Measure g using, for example, light gates.Estimate, and then measure, the weight of familiar objects 11 identify pairs of forces constituting an interaction between two bodies (Newton’sthird law of motion) 12 use the relationship Ek = ½ mv^2 for the kinetic energy of a body13 use the relationship Δ Egrav = mgΔh for the gravitational potential energy transferred near the Earth’s surface14 investigate and apply the principle of conservation of energy including use of work done, gravitational potential energy and kinetic energy. Use, for example, light gates to investigate the speed of a falling object 15 use the expression for work Δ W = FΔs including calculations when the force is not along the line of motion16 understand some applications of mechanics, for example to safety or to sports 17 investigate and calculate power from the rate at which work is done or energy transferred |