Physical Quantities & units
What is kilogram (kg)?
This is the SI unit of mass.
What is kinetic energy?
Energy of motion.
What is a third-class lever? Give one example.
Is a type of lever where the effort is between the load and the fulcrum. Example of this are the broom, the shovel, tweezer, etc.
What is velocity?
Speed in a given direction.
What is energy?
The ability to do work.
Give three examples of base quantities?
Electric Current, Temperature, Luminous intensity, Length, mass, and time are examples of these quantities.
What is potential energy?
Energy stored due to position.
What type of forces are electrostatic, gravity and magnetism?
Non-C0ntact Forces.
What is weight?
The force due to gravity acting on mass.
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed, only transformed.
What are derived quantities? Give three Examples.
Volume, force, Area, Work and speed are examples of these.
What is mechanical energy?
The sum of kinetic and potential energy.
What is a contact force? Give two examples.
Is a type of force where the is a physical contact between the objects.
examples of this type of force are Friction, Normal, Applied force. etc.
What is mass?
The amount of matter in an object
What is the main source of energy on Earth?
The Sun.
What is joule (J)?
The SI unit of energy.
What is Work formula?
Work = Force × Distance?
Name two other simple machines besides levers.
Wheel and axle, incline plane, screw, pulley and wedge
How much is the work done by a force if an object doesn’t move?
0 J
Name two forms of energy from the Sun.
Light and heat
What is kelvin (K)?
Temperature is measured in this SI unit
Calculate the work done when a force of 50 N moves an object 8 m.
400 J
In a lever. What is the fulcrum?
Its the point where the bar turns.
What is newton (N)?
The SI unit of force.
What type of energy do the following process?
a) Water behind the dam, (b) A moving bus (c) Service Tower lines.
Potential energy, Kinetic Energy and Electric Energy