### Revision videos

#### Mechanics

1 use the equations for uniformly accelerated motion in one dimension:

2 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

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

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

9 investigate, by collecting primary data, and use in situations where *m* is constant (Newton’s first law of motion (a = 0) and second law of motion)

10 use the expressions for gravitational field strength and weight

11 identify pairs of forces constituting an interaction between two bodies (Newton’s third law of motion)

12 use the relationship for the kinetic energy of a body

13 use the relationship for the gravitational potential energy transferred near the Earth’s surface

14 investigate and apply the principle of conservation of energy including use of work done, gravitational potential energy and kinetic energy

15 use the expression for work including calculations when the force is not

along the line of motion

16 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

#### Materials

18 understand and use the terms density, laminar flow, streamline flow, terminal velocity, turbulent flow, upthrust and viscous drag, for example, in transport design or in manufacturing

19 recall, and use primary or secondary data to show that the rate of flow of a fluid is related to its viscosity

20 recognise and use the expression for Stokes’s Law, and

21 investigate, using primary or secondary data, and recall that the viscosities of most fluids change with temperature. Explain the importance of this for industrial applications

22 obtain and draw force-extension, force-compression, and tensile/compressive stress-strain graphs. Identify the *limit of proportionality*, *elastic limit* and *yield point*

23 investigate and use Hooke’s law, , and know that it applies only to some

materials

24 explain the meaning and use of, and calculate *tensile/compressive stress*, *tensile/*

*compressive strain*, *strength*, *breaking stress*, *stiffness* and *Young Modulus*. Obtain the Young modulus for a material

25 investigate elastic and plastic deformation of a material and distinguish between them

26 explore and explain what is meant by the terms *brittle*, *ductile*, *hard*, *malleable*, *stiff *and *tough*. Use these terms, give examples of materials exhibiting such properties and explain how these properties are used in a variety of applications, for example, safety clothing, foodstuffs

27 calculate the elastic strain energy in a deformed material sample, using the expression , and from the area under its force/extension graph