Formula Sheet

DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 1 (FISIKA) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING FORCE/KRAG WORK, ENERGY AND POWER/ARBEID, ENERGIE EN DRYWING WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG ELECTROSTATICS/ELEKTROSTATIKA ELECTRIC CIRCUITS/ELEKTRIESE STROOMBANE ALTERNATING CURRENT/WISSELSTROOM QUESTION 11.2 Hand … Read more

Question 11

In an experiment to demonstrate the photoelectric effect, light of different wavelengths was shone onto a metal surface of a photoelectric cell. The maximum kinetic energy of the emitted electrons was determined for the various wavelengths and recorded in the table below. 11.1 What is meant by the term photoelectric effect? (2) 11.2 Draw a … Read more

Question 10

10.1 A teacher demonstrates how current can be obtained using a bar magnet, a coil and a galvanometer. The teacher moves the bar magnet up and down, as shown by the arrow in the diagram below. 10.1.1 Briefly describe how the magnet must be moved in order to obtain a LARGE deflection on the galvanometer. … Read more

Question 9

A battery with an internal resistance of 1 Ω and an unknown emf (ε) is connected in a circuit, as shown below. A high-resistance voltmeter (V) is connected across the battery. A1 and A2 represent ammeters of negligible resistance. With switch S closed, the current passing through the 8 Ω resistor is 0,5 A. 9.1 … Read more

Question 8

Two charged particles, Q1 and Q2, are placed 0,4 m apart along a straight line. The charge on Q1 is + 2 x 10-5 C, and the charge on Q2 is – 8 x 10-6 C. Point X is 0,25 m east of Q1, as shown in the diagram below. Calculate the: 8.1 Net electric … Read more

Question 7

A very small graphite-coated sphere P is rubbed with a cloth. It is found that the sphere acquires a charge of + 0,5 μC. 7.1 Calculate the number of electrons removed from sphere P during the charging process. (3) Now the charged sphere P is suspended from a light, inextensible string. Another sphere, R, with … Read more

Question 6

6.1 The data below was obtained during an investigation into the relationship between the different velocities of a moving sound source and the frequencies detected by a stationary listener for each velocity. The effect of wind was ignored in this investigation. 6.1.1 Write down the dependent variable for this investigation. (1) 6.1.2 State the Doppler … Read more

Question 5

The track for a motorbike race consists of a straight, horizontal section that is 800 m long. A participant, such as the one in the picture above, rides at a certain average speed and completes the 800 m course in 75 s. To maintain this speed, a constant driving force of 240 N acts on … Read more

Question 4

A bullet of mass 20 g is fired from a stationary rifle of mass 3 kg. Assume that thebullet moves horizontally. Immediately after firing, the rifle recoils (moves back) with avelocity of 1,4 m∙s-1. 4.1 Calculate the speed at which the bullet leaves the rifle. (4) The bullet strikes a stationary 5 kg wooden block … Read more

Question 3

Ball A is projected vertically upwards at a velocity of 16 m∙s-1 from the ground. Ignore the effects of air resistance. Use the ground as zero reference. 3.1 Calculate the time taken by ball A to return to the ground. (4) 3.2 Sketch a velocity-time graph for ball A. Show the following on the graph: … Read more