Work and Energy
The definition of Work
the transfer of energy
Kinetic energy is a?
scalar quantity
vector quantity
physical quantity
Scalar Quantity
What is the unit of gravitational potential energy?
Joules
According to law of conservation of energy, energy can be?
Created
Destroyed
Neither be created nor destroyed
Neither be created nor destroyed
Which state of matter is most packed together?
Solids
Liquids
Gases
Solids
Which is needed to calculate work on an angle:
Cos
Tan
Sin
Cos
Which of the following has kinetic energy?
A book on a shelf
A girl sprinting
A stretched spring
A girl sprinting
A mass of 40 kg and a mass of 80 kg are dropped from rest, from the same height. If air resistance is ignored, which would hit the ground first?
The 40 kg mass
The 80 kg mass
Both at the same time
Why is there a noise that comes when you bounce a basketball?
Air molecules are disturbed around the ground causing the ground to move.
How much heat energy is needed to raise the temperature of a 2 kg piece of iron pipe from 20 degrees celsius to 60 degrees celsius if the specific heat capacity of iron is 462 J/Kg degrees celcius?
36,960 J
What variables are needed to calculate work?
Force applied and displacement
A girl of mass 60 kg can sprint at 8 m/s. What is her kinetic energy?
240 J
1920 J
1920 J
Which of the following has gravitational potential energy?
A book on a shelf
A girl sprinting
A stretched spring
A book on a shelf
According to the law of conservation of energy, total energy is?
Increasing
Decreasing
Constant
Constant
Transfer between objects through direct contact