Questions on Physics
The first problem for all of us, men and women, is not to learn, but to unlearn - Gloria Steinem
The act of unlearning is an excellent form of learning. Infact, you will need the skills of unlearning if you intend to become an expert in your desired field.
Do yourself a favor by unlearning, learning and re-learning on a daily basis
If you don't design your own life plan, chances are you'll fall into someone else's plan. And guess what they have planned for you? Not much - Jim Rohn
There's something special about you. It doesn't matter whether you work for a company or someone; what matters is the amount of investment you've made on yourself.
Investing in yourself is the best life plan you can design for your future
Peace begins with a smile - Mother Teresa
Never underestimate the power of your smile. It can lift up the depressed, improve the mood of the downtrodden and even discourage a suicidal attack. Also remember that your smile makes you more beautiful
Smile always for your own good and the good of others
The only person who is educated is the one who has learned how to learn …and change - Carl Rogers
To perfect your learning process, you must learn, unlearn and re-learn. Infact, we all need to learn how to unlearn those vices we know about ourselves.
Do you know that seeing the devastating consequences of vices (perhaps in movies or real-life) can initiate the unlearning processes in one who does such?
Start where you are. Use what you have. Do what you can - Arthur Ashe
Start now. You've got all it takes to achieve greatness, so no environment can limit you. Just begin something, give in your best and don't stop.
Remember, don't stop giving your best if you truly desire greatness. Nothing can stop you except yourself
A measurement of how much the velocity of an object changes with time is termed _____.
E. Velocity-Time graph
F. Average velocity
Acceleration is defined as the rate of change of velocity. Acceleration is also defined as the measurement of how much the velocity of an object changes with time.
Acceleration = Change in velocity/Change in time
If an object changes velocity after a fixed amount of time, then such acceleration is said to be constant (that is: constant acceleration).
We also have the concept of average acceleration in motion.
Average acceleration is the total change in velocity over a period of time, divided by the duration of that period.
Acceleration is a vector quantity and its Standard International (SI) unit is meter per second (m/s) or meter per second square (m/s2).
Which of the following differentiates velocity from speed?
F. Distance and Time
The direction in which an object is moving is what differentiates velocity from speed. In short, velocity is defined as speed in a given direction. It is also defined as the rate of change of displacement.
FA = -FB
FA is the action force while FB is the reaction force.
The above statement expresses _____.
A. Force and Acceleration
B. Force and Gravity
C. Force and Momentum
D. Newton's first law of motion
E. Newton's second law of motion
F. Newton's third law of motion
ANSWER: Newton's third law of motion
Newton's third law states that action and reaction are equal and opposite.
According to the third law of motion, if a body 'A' exerts a force FA on another body 'B', body B will in return exert an equal and opposite force FB on body A. The forces FA and FB are therefore equal in magnitude but opposite in direction.
A natural force that pulls a body towards the center of the earth is termed _____.
A. Centripetal force
B. Centrifugal force
C. Black hole
D. Average acceleration
Gravity is defined as a natural force that pulls a body towards the center of the earth or another physical body having a greater mass.
The effects of gravity on the earth and it's inhabitants are crucial for life.
A Greek letter that expresses density is _____.
rho is a Greek letter that expresses density.
Density is defined as the mass of a unit volume of a substance. It's standard international (SI) unit is kg/m3.
A glass of water has a higher density than an exact glass of oil.
A glass of water has a higher density than an exact glass of oil. This is true because water has more weight (is denser) than oil. For this reason, if oil is poured on water, it floats on it because it's lighter.
It is noteworthy to state that water has a density of 1000kg/m3 while oil has got a lesser value.
An 🍎 apple 🍎 falling from a tree has an unbalanced force.
An apple falling from a tree has an unbalanced force. Think of it this way:
When forces from different directions act on an object and consequently bring about the object's movement, then such forces are unbalanced. If the forces were to be balanced, then the object will remain in a static position.
Force is a quantity measured in _____.
D. Meter per second square (ms-1)
Force is a quantity measured in Newton. This is in honor of Sir Isaac Newton for the great work he had done on motion and force.
Heat transfer indicates two systems of varying temperatures and will always be transferred from a region with lower temperature to another with higher temperature.
Heat transfer indicates two systems of varying temperatures and will always be transferred from a region with higher temperature to another with lower temperature.
Understand that heat is always transferred from a higher temperature region to a lower temperature region.
To better understand the processes of heat transfer, a knowledge on the movement of particles (in matter) is required.
Heat can be created.
Heat cannot be created nor destroyed. Also it cannot be lost. This is true because it's a form of energy (heat energy).
According to the first law of thermodynamics, energy can neither be created nor destroyed but can be transferred from one form to another.
Temperature is defined as the measure or ability of an object or substance to transfer heat energy to another object or substance.
Although temperature is popularly defined as the degree of hotness or coldness of a substance or an object with reference to some standard value; the (above definition) in the question is also correct.
The above definition is true because heat is never static, thus it is always transferred.
Which of the following statement is incorrect concerning gravity?
A. It is a natural force of attraction
B. The earth is spherical in shape and we don't fall off it due to gravity
C. The amount of gravity is the same all around the spherical earth
D. Earth's gravity affects the satellites
E. Gravity is affected by size and closeness of objects
F. In an ideal space environment, gravity is absent
ANSWER: The amount of gravity is the same all around the spherical earth
The amount of gravity is not the same all around the spherical earth. It is slightly stronger on earth surfaces with a greater mass underground than those with lesser masses.
If two bodies are in thermal equilibrium with another body, then they are also in equilibrium with each other.
The above statement is the _____ law of thermodynamics.
The Zeroth Law of Thermodynamics states that if two bodies are in thermal equilibrium with another body, then they are also in equilibrium with each other.
Let's assume we have three bodies named X, Y and Z respectively. According to the zeroth law of thermodynamics, if X=Y and Z=Y, then X=Z.
Which of the following is a derived unit?
Newton (N) is a derived unit for the quantity -> force.
Recall that force is a derived quantity. In fact, it's derived from the product of mass and acceleration. This therefore implies that kilogram per second square (kg/s2) is also a derived unit of force.
In summary, the derived unit of force is kg/s2 or N
The following are fundamental quantities except _____.
B. Electric Current
C. Amount of Substance
Power is not a fundamental quantity. (It is a derived unit).
Fundamental quantities are quantities dependent only on themselves and as a result, their units cannot be changed; nor is related to another fundamental unit.
Fundamental quantities are 7 in number.
When a car moves at a speed in a given direction, its referred to as _____.
Velocity is simply speed in a given direction. It's also defined as the rate of change of displacement.
Note: The Standard International (SI) unit of velocity is meter per second (m/s).
As an instance, if a bus moves at a speed of 10m/s in the nothern direction and suddenly turns into the western direction, moving with a different speed or even the same speed; then that's velocity.
In the above instance, velocity comes into action because the direction of movement changed regardless the speed.
Velocity is a vector quantity because it has both magnitude and direction.
The rate of change of momentum is proportional to the applied force and will take place in the direction of that force.
The above statement is attributed to _____.
A. Albert Einstein
B. Isaac Newton
C. Galileo Galilei
D. Neils Bohr
E. Ernest Rutherford
F. Marie Curie
Answer: Isaac Newton
The rate of change of momentum is proportional to the applied force and will take place in the direction of that force is attributed to Sir Isaac Newton; and that's his second law of motion.
Other laws of motion stated by Newton are:
An object will continue in its state of rest while an object in uniform motion will continue in a straight line, unless an external force acts on it - Newton's first law of motion
To every action, there is an equal and opposite reaction - Newton's third law of motion
The Law of Inertia is also referred to as _____.
ANSWER: Newton's 1st Law of Motion
Newton's 1st Law of Motion, also called the Law of Inertia states that:
A body at rest will continue to be in a state of rest while a body in uniform motion will continue in a straight line; unless an external force acts upon it.
The process whereby the velocity of an object increases and decreases over a period of time is best associated with the term _____.
Acceleration is simply defined as the rate of change of velocity.
For instance, when one rides a bicycle, they begin slowly. Along the journey, they increase the push on the pedals, thus increasing the speed of the bicycle. When they are about to make a turn along their path, the speed of the bicycle will be reduced. Finally, towards the end of the journey, the rider slows down and eventually stops.
Notice in the above instance that the rider makes a turn along their path. This change in direction refers to velocity.
The above instance also shows an increase and decrease in velocity; and this is the concept of acceleration. In fact, acceleration can be positive or negative.
Note: In Physics we use the term acceleration to describe both positive and negative acceleration.
Acceleration is a vector quantity because it has both magnitude and direction.
The rate of motion is best referred to as _____.
Speed is simply the rate of motion. It can also be defined as the rate of change of distance.
Note: When we use the term 'rate' to describe an activity; it simple implies the time expended on such activity.
For instance, If a sprinter runs a 100m (meter) track for 9.6s (seconds); that's simply his speed.
Think of speed as a distance (in meter) covered under a specific time (in seconds)
From the above points, it can be deduced that the Standard International (SI) unit for speed is meter per second (m/s)
Speed is a scaler quantity since it has only magnitude. It has NO direction.
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