Free KCSE Physics Topical Questions KNEC Standards

The readings tabulated below shows how the length of a helical spring varied with the load hanging on it

18/10/2021

0 Comments

The readings tabulated below shows how the length of a helical spring varied with the load hanging on it

(a)
(i) Complete the table to show the values of extension (2mks)

0,4.5,9.2,13.8,18.5,23.2 cm

(ii) Draw a graph of extension (y-axis) against load for the spring (5mks)

Graph

Labeling of axes
Straight line
Location of points
Scale used

(ii) Determining form the graph the proportionality constant of the spring (2mks)

(b) Two springs Q and R have proportionality constants 20N/M and 25N/M respectively. Q weighs 0.2 N while the weight of R is negligible. The two springs are arranged to support a load of 3.0N as shown in the diagram below

Determine the extension in
(i) Q……………………………………………..(1mk)

ii) R ……………………………………………(1mk)

(c) State two factors that determine the proportionality constant of a helical spring (2mks)

Diameter of spring, length of the spring/thickness of the wire coiled to make the spring
Diameter of wire used

0 Comments

The diagram below shows two trolleys, A and B connected to each other by an elastic strip of negligible mass. The trolleys are pulled apart on a smooth plane till tension in the elastic strip is 4.0N and are then released suddenly

18/10/2021

0 Comments

The diagram below shows two trolleys, A and B connected to each other by an elastic strip of negligible mass. The trolleys are pulled apart on a smooth plane till tension in the elastic strip is 4.0N and are then released suddenly

(a) State with reason the total momentum of the trolleys when they are just released (2mks)

Zero (0) –It is because their velocities are still zero/ They are still stationary

(b) Calculate the initial acceleration of trolley A when released (3mks)

(c) The velocity of the trolley B is 0.9ms^-1 just before it collides with A. Determine the velocity of A just before the collision

(d) Which trolley covers a longer distance before collision? Explain (2mks)

trolley A, because of it moves with high velocity

(e) Explain why the elastic strip may not stretch to the same original length after impact (2mks)

Friction force

0 Comments

K.C.S.E Physics Q & A - MODEL 2018PP1QN15

29/7/2020

0 Comments

(a) State Newton’s first law of motion.
(b) A wooden block resting on a horizontal bench is given an initial velocity u so that it slides on the bench for a distance x before it stops. Various values of x are measured for different values of the initial velocity. Figure 9 shows a graph of u² against x.

(i) Determine the slope S of the graph.
(ii) Determine the value of k given that u² = 20kd where k is a frictional constant for the surface.
(iii) State with a reason what happens to the value of k when the roughness of the bench surface is reduced.
(c) An object is thrown vertically upwards with an initial velocity of 30ms^-1. Determine its maximum height (acceleration due to gravity g is 10 ms^-1)

answers

(a) A body remains in its state of rest or uniform motion in a straight line unless acted upon by an external force.

0 Comments

Using the definition of impulsive force, show that F =ma

27/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 2017PP1QN08

Using the definition of impulsive force, show that F ma

answer

0 Comments

K.C.S.E Physics Q & A - MODEL 2016PP1QN18

27/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 2016PP1QN18

(a) State Newton’s first law of motion
(b)A wooden block resting on a horizontal bench is given an initial velocity, u, so that it slides on the bench surface for a distance d, before coming to a stop. The values of d were measured and recorded for various values of initial velocity. Figure 10 shows the graph of u² against d.

(i)Determine the slope, S of the graph
(ii)Given that u² = 20 kd, where k is a constant for the bench surface, determine the value of k from the graph
(iii)State how the value of k would be affected by a change in the roughness of the bench surface
(c) A car of mass 800 kg starts from rest and accelerates at 1.2 ms^-2.
Determine its momentum after it has moved 400 m from the starting point

answers

(a)A body at rest or motion at uniform velocity tends to stay in that state unless acted on by an unbalanced force/ compelled by some external force to act
otherwise.

(b)(iii) Increase in roughness increases k and vice versa
Uniform speed in a straight line – uniform velocity

0 Comments

K.C.S.E Physics Q & A - MODEL 2016PP1QN13

27/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 2016PP1QN13

The graph in figure 10 shows the velocity of a car in the first 8 seconds as it accelerates from rest along a straight line.

Determine the distance traveled 3.0 seconds after the start

answer

0 Comments

K.C.S.E Physics Q & A - MODEL 2012PP1QN16

21/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 2012PP1QN16

(a) Figure 9 shows a trolley on a smooth surface being pulled by a constant force F.

(i) On the axis provided, sketch the velocity-time graph for the motion of the trolley.

(ii) A parachute falling through the air attains terminal velocity after a short-time.
State the reason why it attains terminal velocity.
(b) A ball of mass 200 g is thrown vertically upwards with velocity of 5 m/s. The air resistance is 0.4 N.
Determine;
(1) the net force on the ball as it moves up;
(take acceleration due to gravity g = 10 m/s2)
(ii) the acceleration of the ball;
(iii) the maximum height reached by the ball.
(c) Figure 10 shows the path of an object of mass m attached to a string of length r when whirled in a vertical circle at a constant speed V. A is the highest point on its path.

(i) State the forces that provide the centripetal force on the object when it is at point A.
(ii) Indicate with an arrow on the diagram the direction of the net force F acting on the object when it is at A.

ANSWERS

(ii) Net force on the parachute becomes zero. (Sum of downward forces on it
should be equal to sum of upward forces)

0 Comments

K.C.S.E Physics Q & A - MODEL 2007PP1QN16

15/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 2007PP1QN16

(a) State Newton's first law of motion
(b) A wooden block resting on a horizontal bench is given an initial velocity, u, so that it slides on the bench surface for a distance d, before coming to a stop. The values of d were measured and recorded for various values of initial velocity. Figure 10 shows the graph of u² against d.

(i) Determine the slope, S of the graph
(ii) Given that u² = 20 kd, where k is a constant for the bench surface, determine the value of k from the graph
(iii) State how the value of k would be affected by a change in the roughness of the bench surface
(c) A car of mass 800 kg starts from rest and accelerates at 1.2 ms^-2. Determine its momentum after it has moved 400 m from the starting point

answer

0 Comments

A bullet is fired horizontally at a target. Neglecting air resistance give a reason why the horizontal acceleration of the bullet is zero.

7/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 1999PP1QN24

A bullet is fired horizontally at a target. Neglecting air resistance give a reason why the horizontal acceleration of the bullet is zero.

ANSWERS

Horizontal acceleration is zero because g component horizontally is 0
Horizontal velocity remains constant
Resultant horizontal force is zero
resultant force is Zero.

0 Comments

FORM I - PHYSICS SYLLABUS

Introduction to Physics (4 Lessons)
Measurements 1 (12 Lessons)
Force (16 Lessons)
Pressure (24 Lessons)
Particulate Nature of Matter (12 Lessons)
Thermal Expansion (12 Lessons)
Heat Transfer
Rectilinear Propagation of Light and Reflection at Plane Surface (16 Lessons)
Electrostatics (12 Lessons)
Cells and Simple Circuits (12 Lessons)

FORM II - PHYSICS SYLLABUS

Magnetism (12 Lessons)
Measurements II (16 Lessons)
Turning Effect of Force (10 Lessons)
Equilibrium Centre of Gravity (12 Lessons)
Reflection at Curved Surfaces (16 Lessons)
Magnetic Effect of Electric Current (18 Lessons)
Hooke's Law (8 Lessons)
Waves (14 Lessons)
Sound (12 Lessons)
Fluid Flow (14 Lessons)

FORM III - PHYSICS SYLLABUS

Linear Motion (20 Lessons)
Refraction of Light (20 Lessons)
Laws of Motion (15 Lessons)
Energy, Power and Machines (20 Lessons)
Current Electricity (20 Lessons)
Waves II(10 Lessons)
Electrostatics II (15 Lessons)
Heating Effect of Electric Current (10 Lessons)
Quantity of Heat (20 Lessons)
Gas Laws (15 Lessons)

FORM IV - PHYSICS SYLLABUS

Thin Lenses (20 Lessons)
Uniform Circular Motion (10 Lessons)
Floating and Sinking (15 Lessons)
Electromagnetic Spectrum (15 Lessons)
Electromagnetic Induction (20 Lessons)
Mains Electricity (10 Lessons)
Cathode Rays and Cathode Ray Tube (10 Lessons)
X-rays (8 Lessons)
Photoelectric Effect (15 Lessons)
Radioactivity (15 Lessons)
Electronics (10 Lessons)

The readings tabulated below shows how the length of a helical spring varied with the load hanging on it

(a)
(i) Complete the table to show the values of extension (2mks)

(ii) Draw a graph of extension (y-axis) against load for the spring (5mks)

(ii) Determining form the graph the proportionality constant of the spring (2mks)

(b) Two springs Q and R have proportionality constants 20N/M and 25N/M respectively. Q weighs 0.2 N while the weight of R is negligible. The two springs are arranged to support a load of 3.0N as shown in the diagram below

Determine the extension in
(i) Q……………………………………………..(1mk)

ii) R ……………………………………………(1mk)

(c) State two factors that determine the proportionality constant of a helical spring (2mks)

The diagram below shows two trolleys, A and B connected to each other by an elastic strip of negligible mass. The trolleys are pulled apart on a smooth plane till tension in the elastic strip is 4.0N and are then released suddenly

(a) State with reason the total momentum of the trolleys when they are just released (2mks)

(b) Calculate the initial acceleration of trolley A when released (3mks)

(c) The velocity of the trolley B is 0.9ms^-1 just before it collides with A. Determine the velocity of A just before the collision

(d) Which trolley covers a longer distance before collision? Explain (2mks)

(e) Explain why the elastic strip may not stretch to the same original length after impact (2mks)

K.C.S.E Physics Q & A - MODEL 2018PP1QN15

Using the definition of impulsive force, show that F =ma

Using the definition of impulsive force, show that F ma

K.C.S.E Physics Q & A - MODEL 2016PP1QN18

K.C.S.E Physics Q & A - MODEL 2016PP1QN18

K.C.S.E Physics Q & A - MODEL 2016PP1QN13

K.C.S.E Physics Q & A - MODEL 2016PP1QN13

K.C.S.E Physics Q & A - MODEL 2012PP1QN16

K.C.S.E Physics Q & A - MODEL 2012PP1QN16

K.C.S.E Physics Q & A - MODEL 2007PP1QN16

K.C.S.E Physics Q & A - MODEL 2007PP1QN16

A bullet is fired horizontally at a target. Neglecting air resistance give a reason why the horizontal acceleration of the bullet is zero.

A bullet is fired horizontally at a target. Neglecting air resistance give a reason why the horizontal acceleration of the bullet is zero.

Categories

FORM I - PHYSICS SYLLABUS

FORM II - PHYSICS SYLLABUS

FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

Archives

M.A Nyamoti

HIGH SCHOOL EXAMINATIONS

PRIMARY SCHOOL RESOURCES 8-4-4

PRIMARY SCHOOL RESOURCES CBC

COLLEGE RESOURCES

FREE NOVELS

(a) ​(i) Complete the table to show the values of extension (2mks)

​(ii) Draw a graph of extension (y-axis) against load for the spring (5mks)

​(ii) Determining form the graph the proportionality constant of the spring (2mks)

​(b) Two springs Q and R have proportionality constants 20N/M and 25N/M respectively. Q weighs 0.2 N while the weight of R is negligible. The two springs are arranged to support a load of 3.0N as shown in the diagram below

Determine the extension in (i) Q……………………………………………..(1mk)

ii) R ……………………………………………(1mk)

​(c) State two factors that determine the proportionality constant of a helical spring (2mks)

​(a) State with reason the total momentum of the trolleys when they are just released (2mks)

​(b) Calculate the initial acceleration of trolley A when released (3mks)

(c) The velocity of the trolley B is 0.9ms-1 just before it collides with A. Determine the velocity of A just before the collision

​(d) Which trolley covers a longer distance before collision? Explain (2mks)

​(e) Explain why the elastic strip may not stretch to the same original length after impact (2mks)

Using the definition of impulsive force, show that F ma

K.C.S.E Physics Q & A - MODEL 2016PP1QN18

K.C.S.E Physics Q & A - MODEL 2016PP1QN13

K.C.S.E Physics Q & A - MODEL 2012PP1QN16

K.C.S.E Physics Q & A - MODEL 2007PP1QN16

A bullet is fired horizontally at a target. Neglecting air resistance give a reason why the horizontal acceleration of the bullet is zero.

Categories

FORM I - PHYSICS SYLLABUS

FORM II - PHYSICS SYLLABUS

FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

Archives

M.A Nyamoti

HIGH SCHOOL EXAMINATIONS

PRIMARY SCHOOL RESOURCES 8-4-4

PRIMARY SCHOOL RESOURCES CBC

COLLEGE RESOURCES

FREE NOVELS

(a)
(i) Complete the table to show the values of extension (2mks)

(ii) Draw a graph of extension (y-axis) against load for the spring (5mks)

(ii) Determining form the graph the proportionality constant of the spring (2mks)

(b) Two springs Q and R have proportionality constants 20N/M and 25N/M respectively. Q weighs 0.2 N while the weight of R is negligible. The two springs are arranged to support a load of 3.0N as shown in the diagram below

Determine the extension in
(i) Q……………………………………………..(1mk)

(c) State two factors that determine the proportionality constant of a helical spring (2mks)

(a) State with reason the total momentum of the trolleys when they are just released (2mks)

(b) Calculate the initial acceleration of trolley A when released (3mks)

(c) The velocity of the trolley B is 0.9ms^-1 just before it collides with A. Determine the velocity of A just before the collision

(d) Which trolley covers a longer distance before collision? Explain (2mks)

(e) Explain why the elastic strip may not stretch to the same original length after impact (2mks)