Physics Question Bank Flashcards
(24 cards)
What is an example of conservative force?
Conservative forces include gravitational force, force in elastic springs, and electrostatic force between two charges.
What is an example of gravitational force?
The force exerted by Earth on an object.
Gravitational force is a force that attracts any two objects with mass.
What is the definition of a conservative force?
A force that does work independent of the path taken.
Conservative forces have potential energy associated with them.
Fill in the blank: _______ is an example of a conservative force.
Gravitational force
True or False: Electrostatic force is a non-conservative force.
False
Electrostatic force is considered a conservative force.
Which forces are classified as conservative forces? List them.
Gravitational force
Force in elastic spring
Electrostatic force
1 kW is equal to:
1000 W
1 kW (kilowatt) is a unit of power equal to 1000 watts.
What is the numerical representation of 1 kW in watts?
1000 W
Fill in the blank: 1 kW is equal to _______ W.
1000
True or False: 1 kW is equal to 10^6 W.
False
True or False: 1 kW is equal to 10^3 W.
True
What are the options provided for the equivalence of 1 kW in watts?
106 W
102 W
103 W
104 W
What is the power calculated when a pump lifts 60kg of water through a vertical height of 14m in 10s?
840 watt
Power is calculated using the formula: Power = Work done / Time taken.
Work done can be calculated as the weight of the water (mass * gravity) times height.
Rate of doing work is called:
Power
Power is defined as the amount of work done per unit of time.
If a car has a kinetic energy of 2500 joules, what will be its kinetic energy if its speed is doubled?
10000 J
Kinetic energy is proportional to the square of the speed. If speed is doubled, kinetic energy increases by a factor of four.
A force of 12N is exerting on a box with a displacement of 4m. If the frictional force is 2N, what is the work done?
40 J
Work done is calculated as (Net Force) * (Displacement). The net force is 12N - 2N = 10N.
What is the work done by a boy pushing an object with a force of 15N in a circular path of radius 6m?
1500J
This calculation is based on the work-energy principle and the specific parameters given.
In Einstein’s mass-energy equation, what does ‘c’ represent?
speed of light
‘c’ is a fundamental constant in physics, crucial for understanding relativity.
What form of energy is the work done on a body of mass m lifted through a height h stored as?
potential energy
This concept is key in mechanics, relating to gravitational potential energy.
At what angle is the work done on a body considered negative?
90°
This occurs when the force and displacement are perpendicular.
Fill in the blank: The work done by a force is equal to the force multiplied by the _______.
displacement
True or False: The speed of sound is represented by ‘c’ in Einstein’s mass-energy equation.
False
‘c’ specifically refers to the speed of light, not sound.
What is the unit of work done in the context of physics?
Joule
The Joule is the standard unit of work and energy in the International System of Units.
Work done on the body will be negative if the inclination between force and displacement is what angle?
180 degrees
