Physics

Velocity and Acceleration

len Alfred Ajibola - Tue, 24th December, 2019 @ 15:02: PM

Topics in Physics

Derived Units: Similarities and Differences with Fundamental Units Gravity: Interesting facts on Gravity Relative Density of Substances and Specific Gravity Types of Heat Transfer: Conduction Types of Heat Transfer: Convection Types of Heat Transfer: Radiation Physics Scheme of Work, SS1, First Term Physics Scheme of Work, SS1, Second Term Physics Scheme of Work, SS1, Third Term Velocity and Acceleration Newton's Laws of Motion Importance of Gravity What is Density? Density of various Substances Concepts of Force and Motion Motion and Speed Concept of Heat Transfer Concepts of Heat and Temperature Gravity: What is Gravity? Zeroth Law of Thermodynamics - Thermal Equilibrium Fundamental Quantities and Units in Physics


Academic Questions in Physics

Please check out our Test Your Knowledge page to see all Questions and Answers

The Law of Inertia is also referred to as _____.

  • A. 1st Law of Thermodynamics
  • B. 2nd Law of Thermodynamics
  • C. 3rd Law of Thermodynamics
  • D. Newton's 1st Law of Motion
  • E. Newton's 2nd Law of Motion
  • F. Newton's 3rd Law of Motion

The process whereby the velocity of an object increases and decreases over a period of time is best associated with the term _____.

  • A. Speed
  • B. Velocity
  • C. Momentum
  • D. Constant Velocity
  • E. Acceleration
  • F. Average Velocity

The rate of motion is best referred to as _____.

  • A. Speed
  • B. Velocity
  • C. Momentum
  • D. Inertia
  • E. Acceleration
  • F. Constant Velocity

Consider this expression below:

A body X exerts a force FX on another body Y. In return, body Y exert a force FY back on body X. The forces FX and FY are equal in magnitude but opposite in direction.

Putting the above expression into equation:

FX = -FY

Where FX is the action force

FY is the reaction Force

The above expression relates to _____.

  • A. Theory of Force
  • B. Force Postulate
  • C. Einstein's proposal on Relativity
  • D. Newton's 1st law of motion
  • E. Newton's 2nd law of motion
  • F. Newton's 3rd law of motion

The tendency of a body to remain in a state of rest or in uniform motion is referred to as _____.

  • A. tension
  • B. uniform acceleration
  • C. constant acceleration
  • D. deceleration
  • E. inertia
  • F. velocity

A change in the position of an object with reference to time is best described as _____.

  • A. momentum
  • B. displacement
  • C. velocity
  • D. acceleration
  • E. direction
  • F. motion

The saying "what goes up on earth must come down" can be best attributed to _____.

  • A. force
  • B. motion
  • C. mass
  • D. acceleration
  • E. average velocity
  • F. constant velocity

We have _____ laws of Thermodynamics.

  • A. 1
  • B. 2
  • C. 3
  • D. 4
  • E. 5
  • D. 6

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What is Velocity?

Although velocity and speed are often used interchangeably by students, they are NOT the same thing. As a student, you will need an understanding on motion and speed to better comprehend velocity and acceleration.

Please read on Motion and Speed here.

The direction in which an object is moving is what differentiates velocity from speed.

Velocity can be defined as speed in a given direction.

Velocity can also be defined as the rate of change of displacement.

Velocity = Change in distance/Change in time

Please read on Newton's Laws of Motion here.

Note: Velocity is a vector quantity because it has both magnitude and direction.

Below is a narrative that differentiates speed from velocity:

A bus is moving on a highway at a speed of 100 meters per 20 seconds. If the bus changes its direction and moves at a different speed (or even the same speed), then that's velocity.

As an instance, the bus (above) may move at a velocity of 100m/20s in the northern direction and 100m/20s in the eastern direction.

Note: Speed and velocity both have the same Standard International (SI) unit which is meter per second (m/s).

Please read more on Fundamental and Derived Units here.

 

Acceleration

The velocity of a moving object can either decrease or increase over a period of time; and this is where acceleration comes into play. Consider the instance below:

When you ride a bicycle, you start slowly but as soon as you increase the push on the pedals, the bicycle moves faster (accelerate). When you stop pushing the pedals, the bicycle begins to move slowly (negative acceleration).

Please read on the Concept of Force and Motion here.

From the above instance, we can therefore say that acceleration can also be negative.

Note: Deceleration is an English term used to describe negative acceleration; but in physics, we use the term acceleration to denote both the positive and negative changes in velocity.

Please read more on Synonyms with various Examples here.

Acceleration can be 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).

Consider the instance below:

If we throw a table tennis ball down a slope, it will roll downwards more rapidly at each second.

On the 1st second, let's assume it's velocity to be 20m/s.

On the 2nd second, its velocity becomes 25m/s.

On the 3rd second, it becomes 30m/s.

With regards to the above velocities, such ball is said to have a constant acceleration of 5m/s.

This means that: for every 5 meters moved, the tennis ball accelerates by 1 second.

Please read on the Basic and Fundamental Physics Concepts here.

Note: 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).

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Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.


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Amazing facts in Physics

Image Credit: Ball and Roller Store

Glass Balls actually bounce higher than Rubber Balls

Every planet has its own unique gravitational force, for instance, Mars has a gravity of 3.711 m/s2 while earth’s gravitational force is 9.807m/s2Please read on gravity here

When two metals are put together in space, they will stick together as if they are welded. This phenomenon is called cold welding

The fastest animal on land is Cheetah. It can reach a maximum speed of about 113km per hour.
Please read on motion, speed, velocity and acceeration here


NOTABLE POINTS IN Physics

The Classical Mechanics (Laws of Motion) is a fundamental part of Physics.

Below are the Newton's Laws of Motion:

An object at rest 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.

Please read on Motion and Speed here.

The rate of change of momemtum is proportional to the applied force and will take place in the direction of that force.

Newton's Second Law of Motion.

To every action, there is an equal and opposite reaction.

Newton's Third Law of Motion.

Please read on Newton's Laws of Motion here.

The study of Thermodynamics revolves around the relationship between heat, temperature, energy and mechanical work; and these can be summarised under the 4 laws of Thermodynamics (Numbered zero through three).

You can read on the Concepts of Heat and Temperature here.

Below are the 4 laws of thermodynamics:

Zeroth law of thermodynamics – If two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

Please read on the Zeroth Law of Thermodynamics here.

1st law of thermodynamics – Energy can neither be created nor destroyed but can be changed from one form to another.

You can read on the Food Chain here.

2nd law of thermodynamics – The entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium.

3rd law of thermodynamics – As temperature approaches absolute zero, the entropy of a system approaches a constant minimum.

Fuses are present in many electrical devices. They are basically πŸ”₯ fire-breakers πŸ”₯

If there is a power surge, the fuse will break, preventing damage to the electrical devices. It will also prevent the incidence of πŸ”₯ fireπŸ”₯ on/from such device.

Physics is one of the core sciences.

Physics is defined the scientific study of matter and the movement of matter through the space and time of the universe.

Understanding the basic and fundamental concepts of physics will help you better comprehend this subject. Below are some of the concepts:

  1. The Laws of Motion (Classical Mechanics)
  2. Electromagnetism
  3. Relativity
  4. Thermodynamics

Please read on the basic introduction of the above physics concept here