When we use our muscles to move things, we use:
Mechanical force
Muscular force
Gravitational force
Frictional force
Which energy converts kinetic energy from falling water into electricity ?
Solar energy
Wind energy
Hydropower
Geothermal energy
Geothermal energy is called a renewable energy source because:
Heat is continuously produced by earth
Heat is continuously produced by fire
Heat is continuously produced by sun
Heat is continuously produced by humidity
Which make our work easier and faster?
Simple machines
Generators
Cars
Inverter
What is solar energy?
Energy we get from earth
Energy we get from water
Energy we get from wind
Energy we get from sun
In which of the following is force applied to overcome resistance?
Inclined plane
Lever
Wheel and axle
Pulley
Any influence that causes an object to undergo a certain change, either concerning its movement or direction is called:
Force
Matter
Change
Vibration
Why should energy sources be used carefully?
Because energy sources are in limited supply.
Because energy sources are present in abundance.
Because energy sources are renewable.
Because energy sources are present in unlimited supply.
Which is built to trap water?
Dams
Canals
Well
Tank
When we play a music system, electrical energy gets converted to:
Light energy
Sound energy
Heat energy
Mechanical energy
