GR: Lubricating and oiling of mechanical machines?
to reduce the friction between moving parts to prevents their erosion
The relation between the friction force and the speed of the object is......................
inverse
GR: We can see lightning before hearing thunder.
Electromagnetic waves, mechanical waves.
Infrared rays are used in.......................
Night vision, cooking food, remote sensing instruments.
What is the idea of electromagnet?
Electric energy - Magnetic energy
Mention types of periodic motion?
Wave, Circular , Vibrating motion.
What are forces originate due to motion?
Inertia, Friction
What are fundamental forces in Nature?
Earth's gravitational force, Electromagnetic force, Nuclear force
Visible light used in ....................
TV cameras, photographic cameras, Light show
If you are in a stopping car and another car is moving forward beside you, you will imagine your car ...............
moving backward
this figure represents.....................motion.
circular
GR: Blood is pumped all over the body organs?
Due to Heart muscles contraction and relaxation.
What is the type of motion?
Transitional
Mention one use of gamma rays?
Medical purposes
What are uses of electromagnet?
Electric winches, Electric bells
Electric motor changes .................into..................... and it is used in...............
Electric, Kinetic , Mixer
GR: Importance of nuclear force.
Medicine, industry, Scientific researches, production of electric energy, Military proposes