a Draw a free body diagram to show the forces acting on the ball when it is moving upwards at point A. a State whether the volume of the gas will increase or decrease as the temperature increases at constant pressure. Answers to all exercises and exam-style questions are provided on the CD-ROM for students to use to monitor their own understanding and track their progress through the course. Name the charge carriers responsible for the current in a: a metal b salt solution that conducts electricity. d Calculate the work done on the child by this force as she moves from the top of the slide to the bottom.

c A loudspeaker is placed close to the open end of a long tube which is closed at the other end, as shown. a State the direction in which the maximum number of α-particles will be detected after hitting the foil. a State which particles in the carbon atom are leptons and how many leptons in total are found in one neutral atom of carbon.A student wants to obtain a large heating effect in a resistor connected to a laboratory power supply. In the following situations, c to g, state what happens, if anything, to the dark and bright fringes. a Complete these statements about progressive waves: In longitudinal waves the vibrations are _______________ to the direction of the energy transfer.

State whether the collisions between the particle and the walls of the cube are elastic or inelastic. Using stationary wave patterns This exercise helps you to use stationary wave patterns to find wavelengths, frequencies and speed.

a As represented in the diagram of a solid, each atom is in contact with a number of neighbouring atoms. in each of the three closed loops: Choose a direction to follow around a loop, in the direction of the current. These calculations can be performed simply using the idea that resistance is proportional to length and inversely proportional to area. The frequency of sound from the loudspeaker is gradually increased and the next mode of vibration is found.

b Copy the sketch graph and add a second line to the graph representing the motion of a car moving with a higher constant velocity. Sketch the graph you would expect to obtain and indicate how you would deduce the Young modulus from the graph. Air resistance acts in the opposite direction to the ball’s velocity and increases as its velocity increases. A uniform electric field can be produced by applying a potential difference between two parallel plates.This exercise provides practice drawing electric fields and understanding the rules that should be followed. d State the distance in centimetres between a node and the nearest antinode and compare this distance with the wavelength λ of the progressive wave.

At the start of the experiment, one mass is pulled forwards and released so that it swings back and forth. a State what is meant by the other quantities in the formula and, on a copy of the diagram, mark the distances a, x and D. Using the correct terms to explain stationary waves It is important to be able to use terms such as amplitude and phase correctly and to make comparisons. Two important types of electrical thermometer are the resistance thermometer and the thermocouple thermometer. Thermometers and temperature scales There are many different types of thermometer: liquid-in-glass, thermocouple, electrical resistance etc.State whether the pressure of the air would be greater or less than the value you have calculated in part g. Gravitational potential energy and kinetic energy You can calculate the GPE and the KE of an object using these equations: Ep = mgh Ek = 21 mv2 In this exercise you will look at the derivations of these equations. d We can consider the Earth’s gravitational pull as if all of its mass were concentrated at one point, its centre of gravity.