Grade 11 – Paper 1 (Physics)
Ex: GR
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GRADE 11
PHYSICAL SCIENCE
PAPER 1 - PHYSICS
November 2009
MARKS:150 (Section A – 24 marks. Section B – 126 marks.)
TIME:3 HOURS
EXAMINER:GR
MODERATOR:KW
General Instructions:
1.Answer ALL the questions.
2.Section A: Follow the instructions below.
3Section B: (Instructions on page 4.)
4.Refer to the attached data booklet where necessary.
Requirements:Pocket calculator
Ruler, pencil, pen
SECTION A
INSTRUCTIONS
- Answer questions 1-3 on the printed ANSWER SHEET enclosed in your question paper.
- Do not make any other marks on your answer sheet. Any calculations or writing that may be necessary when answering multiple-choice questions 3.1 to 3.6 should be done on blank / scrap paper.
- Four possible answers, indicated by A, B, C and D are supplied with each question in Q3. Choose only that answer which in your opinion is the correct or best one and mark the appropriate block on your answer sheet with a cross (X).
If more than one block is marked, no marks will be awarded for that answer.
EXAMPLE
QUESTION:The symbol for the SI unit of time is ...
A. t
B. h
C. s
D. m
ANSWER:
A
/B
/C
/D
SECTION A
Answer this section on the attached ANSWER SHEET.
QUESTION 1ONE – WORD / TERMITEMS
Give ONE word/term for each of the following descriptions. Write only the word/term next to the question number (1.1 – 1.4) on the attached ANSWER SHEET.
1.1A ball of clay is dropped from a height of 30 m. It sticks to the ground on impact. Ignore air resistance. The graph below is of ……………. against time. (1)
1.2In a closed system involving a collision where the kinetic energy is conserved, the collision is …………… (1)
1.3Force per unit charge is defined as …………………(1)
1.4Resistors in parallel are also known as ……………… dividers.(1)
[4]
QUESTION 2TRUE OR FALSE
Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only 'true' or 'false' next to the question number (2.1 – 2.4) on the attached ANSWER SHEET. Correct the statement if it is FALSE.
2.1The resultant of two vectors is a single force that has the same effect as the two forces acting together. (2)
2.2The Newton three reaction force to the weight of a person is the force of the person attracting the earth. (2)
2.3When two identically shaped unequal positively charged spheres touch each other, the electrons are transferred from the sphere with the lesser positive charge to the sphere with the greater positive charge. (2)
2.4The effective resistance of two or more resistors connected in parallel, is always less than the resistance of the smallest resistor. (2)
[8]
QUESTION 3MULTIPLE-CHOICE QUESTIONS
3.1Which two quantities are correctly listed below?
VECTOR / SCALARA / energy / distance
B / power / mass
C / momentum / time
D / displacement / acceleration
(2)
3.2When three forces acting at the same point are in equilibrium, which one of the following statements is always true?
AEach force is the equilibrant of the other two.
BThe forces have different magnitudes.
CEach force is the resultant of the other two.
DThe forces have equal magnitudes.
(2)
3.3Two spring balances P and Q are connected to a wall as shown below. A horizontal force of 100 N is exerted on spring balance Q.
What will be the readings on spring balances P and Q? (Assume that the weight of the balances and string is negligible and the system is stationery).
A / 0 N / 100 N
B / 25 N / 75 N
C / 50 N / 50 N
D / 100 N / 100 N
(2)
3.4If the momentum of an object of constant mass doubles, the kinetic energy of the object will be
Aone quarter of the original.
Bhalved.
Cdoubled.
Dfour times the original.
(2)
3.5When two small spheres X and Y, carrying identical positive charges, are placed at a distance apart, they repel each other with a force F. If the charge on sphere X is doubled while all the other variables remain unchanged, the new forces which X and Y experience respectively are:
Force on X / Force on YA / F / F
B / 2 F / 2 F
C / F / 2 F
D / 2 F / F
(2)
3.6Two identical light bulbs, P and Q, are connected in series to a battery of negligible internal resistance. V1 and V2 are two identical voltmeters.
If bulb P were to blow, how will the readings on V1 and V2 respectively change?
V1 / V2A / increase / become zero
B / become zero / increase
C / become zero / become zero
D / remain the same / remain the same
(2)
[2 x 6 = 12]
SECTION B
1.Answer this section on the paper provided.
2.In ALL calculations the formulae and substitutions must be shown.
3.Round off your answers to TWO decimal places.
QUESTION 4
4.1Two forces of 25 N and 35 N act on a point at an angle of 90° to each other.
4.1.1Using a completely labelled rough sketch, determine the resultant of these two forces.(5)
4.1.2Determine the equilibrant of the two forces.(2)
4.2Two successive displacements are made by a person – the one is 3 km East and then 4 km South.
4.2.1Define the term: ‘displacement’.(2)
4.2.2What is the difference between displacement and distance?(2)
4.2.3Calculate the distance covered in this example.(1)
4.2.4Calculate the resultant displacement in this example. Use a rough sketch.(5)
4.3A mass m of weight W is suspended from a light rope which is attached directly to the rope at point X. The rope is strung between two vertical posts as shown in the diagram.
4.3.1Draw a sketch of the triangle of forces, labelling each force and indicating the size of each angle. (5)
4.3.2In which part of the rope is the force greater, in A or B?(2)
4.3.3The rope will break if the force in the rope exceeds 650N. Calculate the maximum mass which the above arrangement can support. (6)
4.4A slope is inclined at an angle of 37° to the horizontal. A crate weighing 1020 N is stationary on the slope.
4.4.1Draw a labelled sketch of the crate on the slope, showing the components of its weight parallel and perpendicular to the slope. Label relevant angles. (4)
4.4.2Calculate the force preventing the crate from sliding down the slope.(4)
[38]
QUESTION 5
5.1State Newton’s second law of motion in words.(2)
5.2A horizontal force of 12 N accelerates a trolley of mass 5kg, along a horizontal surface as shown in the diagram.
A constant frictional force acts on the trolley as it accelerates from rest to a speed of 10 m.s-1 in 5 s.
5.2.1Calculate the magnitude of the acceleration of the trolley.(3)
5.2.2Determine the magnitude of the frictional force.(4)
5.2.3Classify the frictional force as being either STATIC or DYNAMIC.(1)
5.2.4Hence, calculate the coefficient of friction for this trolley.(4)
5.3State the law of conservation of momentum.(2)
5.4Collisions happen on the roads in our country daily. In one of these collisions, a car of mass 1 600kg, travelling at a speed of 30m·s-1 to the left, collides head-on with a minibus of mass 3 000kg, travelling at 20m·s-1 to the right. The two vehicles move together as a unit in a straight line after the collision.
Calculate the velocity of the two vehicles after the collision.(6)
5.5A boy holds a book against a wall by pressingit firmly at 90° to the wall.
5.5.1Draw a neat sketch showing the forces acting on the book.(4)
5.5.2Why does the book remain stationary?(2)
5.5.3Select one of the forces from 5.5.1 and, after writing down your choice, identify its Newton 3 reaction force. (2)
5.6Given that the mass of the earth is represented by M and the mass of an object on the earth by m. The radius of the earth is represented by r.
5.6.1State Newton’s Law of Universal Gravitation.(2)
5.6.2This law can be used to show that .
(a)what does ‘g’ represent in this equation? (A value is NOT required) (2)
(b)why is ‘m’ not part of the equation?(2)
5.6.3Calculate the value of g at a point 8,0 x 106 m from the centre of the earth. Use 6x1024 kg as the mass of the earth. (3)
[39]
QUESTION 6
6.1Two small spheres, hanging from silk threads, 100 mm apart, carry charges of +2,0 x 10-6 Cand -6x10-6C respectively. The spheres are free to move.
6.1.1Calculate the magnitude of the initial electrostatic force between the spheres.(4)
6.1.2Calculate the charge on each sphere after they have made contact.(2)
6.1.3Calculate the number of electrons which are transferred from one sphere to the other when they make contact. (2)
6.2A small positive charge is placed 0,3 m away from a sphere with a positive charge of 1,6x10-8 C.
6.2.1Draw a diagram of the electric field around the sphere ignoring any distortion that results from the small charge being nearby. (4)
6.2.2Calculate the magnitude and direction of the strength of the electric field at the position of the small positive charge. (4)
6.3In a Millikan experiment, an oil drop with a negative charge of 3,2 x 10-16 C is in equilibrium at point A between oppositely charged horizontal plates which are 50 mm apart. The potential difference across the plates is 100V.
6.3.1What is the magnitude of the electrostatic force exerted on the drop?(4)
6.3.2Calculate the mass of the drop.(3)
6.4When the potential difference across the plates of a capacitor is 10V, the capacitor stores 20µC of charge. Calculate the capacitance of the capacitor. (4)
6.5The two plates of a parallel plate capacitor in air are separated by 3mm. The area of one of the plates is 9m2. Calculate the capacitance of the capacitor in microfarads. (4)
[31]
QUESTION 7
7.1The circuit below has a potential difference of 10 V across the terminals of the battery and r2 has a resistance of 3 Ω.
7.1.1If the total resistance across the parallel combination is 1,6 Ω, calculate the resistance of r1. (4)
7.1.2Calculate the current flowing through the ammeter.(4)
7.2The ammeters have negligible internal resistance. The EMF of the battery is 24 V, with an internal resistance, r. When S is closed, the readings on A1 and A2 are 2A and 1,5 A respectively.
7.2.1Determine the reading on V1 when the switch, S, is closed.(4)
7.2.2What will be the reading on V1 if S is opened?(2)
7.2.3Calculate the internal resistance, r, of the battery.(4)
[18]
TOTAL 150
END OF PAPER
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