39 Questions
What is the definition of energy in physics?
The capacity to cause change in an object
What is the law of conservation of energy?
The total energy of an isolated system cannot change
What is the equation that expresses the first law of thermodynamics for a closed system?
E2 - E1 = Q – W
What is the internal energy (E) equal to?
The difference of the heat transfer and the work done
What is the physical property that must be transferred to an object to perform work on it?
Energy
What is the characteristic of energy that makes it a conserved quantity?
It can change form but not amount
What is displacement in linear motion?
The vector difference between the ending and starting positions of an object.
What is the formula for average velocity?
Vav = ∆x / ∆t
What is the instantaneous velocity of an object?
The velocity of an object at a specific point in time.
What is the difference between average velocity and average speed?
Average velocity is a vector, while average speed is a scalar.
What is the unit of average velocity?
Meter per second
What is the name of the type of motion a pendulum exhibits when released?
Simple harmonic motion
What is the period of a pendulum dependent on?
Both the length of the pendulum and the amplitude of the pendulum's swing
What is the frequency of a pendulum related to?
The number of times the pendulum swings back and forth per second
What is the equation that relates the period of a pendulum to its length and gravitational acceleration?
T = 2π√(l/g)
What is the purpose of a centrifuge in a laboratory?
To separate fluids, gas, or liquid based on density
What is the principle behind the operation of a centrifuge?
Sedimentation principle
What happens to objects that are less dense in a centrifuge?
They move to the center of the tube
What is the force that retards a sphere moving through a viscous fluid proportional to?
The velocity of the sphere, the radius of the sphere, and the viscosity of the fluid
What are the units of Fd in Stokes' law?
N
What is the role of the buoyant force in Stokes' law?
It is in equilibrium with the difference between the download gravitational force and upward buoyant force
What is the symbol for the viscosity of the fluid in Stokes' law?
η
What is the direction of the frictional force (Fd) acting on the interface between the fluid and the particle?
Opposite to the direction of motion
What is the direction of the buoyant force relative to the external force?
Parallel to the external force but in the opposite direction
What is the purpose of a centrifuge in relation to gravity?
To increase the acceleration due to gravity
What is the retarding force acting on a particle moving in a fluid due to?
Frictional resistance
What are the three forces that act on a rigid particle moving in a fluid?
External force, buoyant force, and drag force
What is the drag force exerted by a fluid on a solid?
A force in the direction of the fluid flow
What do Newton's laws of motion describe?
The relationship between a body and the forces acting upon it
The unit of force is Kg.m/s²
True
Momentum is a scalar quantity
False
Impulse is equal to the change in momentum
True
The gravitational force between two objects is inversely proportional to the square of the distance between them
True
A net force of 0 Newtons acting on an object means it is accelerating
False
The weight of an object is the same as its mass
False
The acceleration of an object is directly proportional to the net force acting on it
True
The unit of momentum is Kg.m/s
True
The force of gravity is a contact force
False
The mass of an object is 1 kg, its weight is also 1 N
True
Test your understanding of energy, its properties, and the principles of conservation of energy in physics. Learn about the capacity to do work, the ability to cause change, and the laws that govern energy transfer. Take this quiz to see how well you grasp the concepts of mechanics and motion.
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