Get premium membership and access questions with answers, video lessons as well as revision papers.
Gravitational force –this is the force of attraction between two bodies of given masses. - Earth’s gravitational force is the force which pulls a body towards its center. This pull of gravity is called weight.
Magnetic force – this is a force which causes attraction or repulsion in a magnet.
Electrostatic force – this is the force of attraction or repulsion of static charges.
Centripetal force – this is a force which constrains a body to move in a circular orbit or path. 9. Surface tension – this is the force which causes the surface of a liquid to behave like a stretched skin. This force is cohesive.
Force of friction – this is a force which opposes the relative motion of two surfaces in contact with each other. Friction in fluids is known as viscosity.
Tension force – this is the pull or compression of a string or spring at both its ends.
Upthrust force – this is the upward force acting on an object immersed in a fluid.
Cohesive and adhesive forces – cohesive is the force of attraction of molecules of the same kind while adhesive is the force of attraction of molecules of different kinds.
Mutiso answered the question on October 9, 2018 at 06:51
- State three properties of gamma rays which differ from that of alpha and beta particles(Solved)
State three properties of gamma rays which differ from that of alpha and beta particles.
Date posted: September 20, 2018. Answers (1)
- The speed of sound in air is 340 m/s.A loudspeaker placed between two walls X and Y, but nearer to wall x than wall y,...(Solved)
The speed of sound in air is 340 m/s.A loudspeaker placed between two walls X and Y, but nearer to wall x than wall y, is sending out constant sound pulses.How far is the speaker from wall Y if it is 200 m from wall X and the time between the two echoes received is 0.176 s.
Date posted: September 17, 2018. Answers (1)
- The ship sends out an ultrasound whose echo is received after 10s. If the wavelength of the ultrasound in water is 0.05 m and the...(Solved)
The ship sends out an ultrasound whose echo is received after 10s. If the wavelength of the ultrasound in water is 0.05m and the frequency of the transmitter is 50kHz, calculate the depth of the ocean
Date posted: September 17, 2018. Answers (1)
- A cog wheel rotating uniformly produces sound of wavelength 1.65 m. If it makes 10 revolutions/second, find the number of teeth on the wheel, given...(Solved)
A cog wheel rotating uniformly produces sound of wavelength 1.65 m. If it makes 10 revolutions/second, find the number of teeth on the wheel, given that the velocity of sound in air is 330 m/s.
Date posted: September 17, 2018. Answers (1)
- Two girls stand 200 m from a wall. One bangs two pieces of wood together while the second starts a stop watch and stops it...(Solved)
Two girls stand 200 m from a wall. One bangs two pieces of wood together while the second starts a stop watch and stops it when he hears the echo. If the time shown on the stop watch is 1.2 s, calculate the speed of sound.
Date posted: September 17, 2018. Answers (1)
- It is noted that 250 cm^3 of fluid flows out of a tube, whose inner diameter is 7 mm,in a time of 41 s. What...(Solved)
It is noted that 250 cm^3 of fluid flows out of a tube, whose inner diameter is 7 mm,in a time of 41 s. What is the average velocity of the fluid in the tube?
Date posted: September 17, 2018. Answers (1)
- A water wave travels 12 m in 4 s. If the frequency of the waves is 2 Hz, calculate the speed and the wavelength of...(Solved)
A water wave travels 12 m in 4 s. If the frequency of the waves is 2 Hz, calculate the speed and the wavelength of the wave.
Date posted: September 17, 2018. Answers (1)
- The length of a spring is 16cm. Its length becomes 20cm when supporting a weight of 5.0N.Calculate the length of the spring when supporting a...(Solved)
The length of a spring is 16cm. Its length becomes 20cm when supporting a weight of 5.0N.Calculate the length of the spring when supporting a weight of 200N and comment based on the answer.
Date posted: September 17, 2018. Answers (1)
- A metal cube suspended freely from the end of a spring causes it to stretch by 5 cm. A 500g mass suspended from the same...(Solved)
A metal cube suspended freely from the end of a spring causes it to stretch by 5 cm. A 500g mass suspended from the same spring stretches it by 2 cm. If the elastic limit is not exceeded, by what length will the spring stretch if a mass of 1.5 kg is attached to its end?
Date posted: September 17, 2018. Answers (1)
- Express each of the following numbers in standard form
a) 0.0000009047=
b) 201=
c) 0.087=
d) 2670=
(Solved)
Express each of the following numbers in standard form
a) 0.0000009047=
b) 201=
c) 0.087=
d) 2670=
Date posted: September 17, 2018. Answers (1)
- What will happen if you throw an empty glass jar with lid on and tight into a fire? Explain(Solved)
What will happen if you throw an empty glass jar with lid on and tight into a fire? Explain
Date posted: September 11, 2018. Answers (1)
- Why can't alternating current be used for recharging a battery?(Solved)
Why can't alternating current be used for recharging a battery?
Date posted: August 23, 2018. Answers (1)
- Explain the difference in the shape of the drops of mercury and water when placed on a clean glass surface(Solved)
Explain the difference in the shape of the drops of mercury and water when placed on a clean glass surface.
Date posted: August 21, 2018. Answers (1)
- The count rate of a radioactive indium falls from 3200 counts per minute to 200 counts per minutes in 220 minutes(Solved)
The count rate of a radioactive indium falls from 3200 counts per minute to 200 counts per minutes in 220 minutes. Determine the half-life of the radioactive isotope
Date posted: August 19, 2018. Answers (1)
- A white paper is a good reflector of light but does not form an image like a mirror. Explain this observation(Solved)
A white paper is a good reflector of light but does not form an image like a mirror. Explain this observation
Date posted: August 19, 2018. Answers (1)
- You are provided with the following apparatus. - a spring balance - a beaker - cork - a sinker - water(Solved)
You are provided with the following apparatus.
- a spring balance
- a beaker
- cork
- a sinker
- water
Using the above apparatus, describe an experiment to determine the relative density of cork.
Date posted: August 19, 2018. Answers (1)
- State the ways of increasing magnitude of the induced current and electromotive force produced by both the ac and dc generators (Solved)
State the ways of increasing magnitude of the induced current and electromotive force produced by both the ac and dc generators
Date posted: August 14, 2018. Answers (1)
- Describe eye defects(Solved)
Describe eye defects
Date posted: August 14, 2018. Answers (1)
- Explain the effects of surface tension(Solved)
Explain the effects of surface tension
Date posted: August 7, 2018. Answers (1)
- Distinguish between thermionic emission and photoelectric effect(Solved)
Distinguish between thermionic emission and photoelectric effect.
Date posted: August 7, 2018. Answers (1)