We live in the century of science and technology, which has altered our lives. Even when humans had little knowledge of science, their lives were ruled by scientific principles. When we kindle a fire, it is a chemical reaction, and when we eat and digest food, it is a biological reaction. No one action in our lives defines our scientific field. Similarly, physics regulates our daily lives and engages us in many activities and objects. Here we shall examine how physics helps us conduct our daily work efficiently and successfully.
Physics is a natural science that studies matter, force, energy, and motion. Physics investigates how the cosmos works, how Earth revolves around the sun, how lightning strikes, how our refrigerator works, etc. In summary, physics governs our world, and our reality cannot be separated from the miracles of Physics. Look at you, and you will see many objects that work on Physics principles. Using Physics knowledge, we may describe our various actions. Here, we will help with examples of how physics affects our daily lives and how we may benefit from it.
Walking involves several physics principles. It includes weight, friction, gravitational law, potential, and kinetic energy. We walk like an inverted pendulum. When we stand, our foot becomes our axis, and our bulk is concentrated in our belly, forming an arc. The Earth responds to our weight by exerting an opposing vertical force on our leg, slowing us down until our portion is closest to our belly. In motion, kinetic energy exceeds potential energy, but potential energy increases as the part approach belly or arc. The stored potential energy is transformed into kinetic energy in subsequent steps. We are a flawed pendulum because not all potential energy is converted to kinetic. Only 65% of energy is provided by stored potential energy, the rest 35% by biochemical processes. (2001)
W=F*S, therefore, we accomplish work when we apply force and traverse a distance. Walking uses Newton's three laws of motion. So long as a body is at rest, it obeys the first rule of action. Inertia is maximal at rest. The body needs the most force to break free of inactivity, i.e., to walk. During walking, inactivity increases when we place our foot on the ground and reduces when we lift our foot. The second law of motion asserts that acceleration is precisely proportionate to the force we utilize or exert when walking. To illustrate the third law of action, we apply pressure on the ground, which imposes a reactive vertical pressure on our bodies. (Kramer, 2011)
Thermodynamics is the study of heat, temperature, and its work. Heat is a kind of energy that may be exchanged across media. Heat moves from hotter to colder surfaces. When we put a hardpan on a hot burner, the energy in the flame transfers heat to the pan, making it more desirable. This is conduction. Convection moves molecules in liquids and gases. When we heat the pan, the water molecules on the bottom start heating up, and when they are hot enough, they start migrating to the top of the water. The surface water molecules are colder and heavier than hot water molecules, so they start migrating down and this continues until all moisture is at the same temperature (touch math, 2011)
Cooking is an open system because matter and energy are lost. In our scenario, the energy lost by the flame is utilized by the pot to heat water. Hence the total energy is saved. A pressure cooker employs heat energy to cause chemical changes in food, thereby obeying the rule of thermodynamics that spontaneous works are done by work energy. (Lethbridge)
Cutting fruits and vegetables
We don't think about physics when we chop fruit and vegetables, yet it is. To cut something, we must apply pressure to the knife. With more tension, we may easily cut an item. Stress is directly dependent on force and inversely dependent on area. In basic terms, we can miss a thing with more power, but not with a knife with thicker edges. We learn from experience that blades with smaller edges can help cut an object effortlessly. Similarly, a sharper knife cuts well than a dull. The rough edges of the blunt knife increase friction, making it harder to miss an item.
God gave us our eyes as a gift. This tiny organ shows us global wonders. When we discuss body components and their functions, we are talking about biology. We often overlook the reality that our bodies' functioning is governed by physics and chemistry. When we talk about sight, we learn that our eyes act like cameras to capture our surroundings. Our eyes' convex lens converges or concentrates light. The cornea and lens concentrate light entering our eyes. The iris limits the quantity of light entering the eye and forms a real and inverted image on the retina. Photoreceptors turn light into electrical signals transmitted to the brain's vision centre. The vision centre analyses the electric signal and reassembles it to be viewed by the eye. The picture we see is due to the object's light reflection. This is why humans can't see in the dark. (Edmondson)
The eye can distinguish between forms and colours. When light hits a red item, it absorbs all the hues and reflects red. This tells us the book's cover is red. When light hits a white thing, it skips all shades; appearing white (we also regard light as white light). Similarly, light falling on a black object absorbs all light and does not reflect it, therefore seeming black. (Pappas)
Close and open doors
Opening and shutting hinged doors require physics. Torque is involved in the door opening and shutting. Torque is the force needed to rotate an item around an axis. We may easily open a door by creating torque, ®=F*l sin, where l is the distance of the hinge from the doorknob or handle. (AP Only) Lesson 27a, 2013)
We need to apply greater torque to the knob near the hinge, resulting in less angular acceleration. The force perpendicular to the door produces more excellent angular acceleration. Using force on the doorknob causes it to revolve on its axis, utilizing the torque principle. The door opens with positive torque clockwise and negatively anticlockwise. (Broholom)
We have seen a modest illustration of physics, yet it governs all life: physics influences many natural phenomena and artificial items such as vehicles, refrigerators, microwaves, and escalators. So physics rules our universe.
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