PHY101 Physics Assignment 01 Fall 2020 Solution / Discussion Due Date: 16-12-2020
Assignment # 1
Semester: FALL 2020
Total Marks: 25
Due Date:16 December, 2020
The assignment has been designed to enhance your knowledge and understanding of Physics & and their applications in your daily life.
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Question No. 1 Marks = = 3 +3 = 6
Which of the following events involves the utmost human appearance of talent, passion, and intelligence?
Write the reason of your above selected choice as well.
Question No. 2 Marks = 10
Question No. 3 Marks = 5+4 = 9
b) Write at least five applications of frication from your daily life.
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(a) Painting and sculpture :
Art forms have always been created to communicate important messages and to inspire people to act and think. Before humankind learned to read, we depended solely on word of mouth or on visual symbols to express meanings and to learn something.
Knowledge is a soul. Knowledge loving us. They play a very important role in our talent, passion and intelligence. We can learn a lot from literature and because of that we can progress in a lot of things. By reading literature. We can make a lot of changes in our lives and learn a lot because of which we can progress in the world.
Music plays a very important role in our daily lives. It is a spiritual peace that creates passion in us, creates new hope in us. Encourages us to move forward.
Religion teaches us a lot about how to live and the good ways and things that come into our daily lives. It inspires us to do what is good inside. This is essential for our intelligence.
Science plays a very important role in artificial intelligence and it inspires us to move forward in our daily lives, it inspires new inventions. Enthusiasm for making new things. It passionate us for new inventions.
Question No. 2
A 1400-kg car eners a passing zone and accelerates from 70 to 95 km/h. (a) How much work is done on the car? (b) If the car then brakes to a stop, how much wrok is done on it?
vi=70 km/h=(70*1000)/3600 m/s= 19.44m/s
vf=95 km/h=(95*1000)/3600 m/s= 26.39m/s
By Work-Energy Theorem
W= ∆ K.E
W=1/2(1400)(26.39 – 19.44)2
(b) Given Data
vf=0 km/h= 0*1000/3600= 0 m/s
vi=95 km/h= 95*1000/3600 = 26.39 m/s
By Work-Energy Theorem
W= ∆ K.E
W= 487,502.5 J
(b) Write at least five applications of frication from your daily life.
Walking We can walk only if we apply frictional force. Friction is what holds your shoe to the ground. The friction present on the ice is very little, this is the reason why it is hard to walk on the slippery surface of the ice.
Writing A frictional force is created when the tip of the pen comes in contact with the surface of the paper. Rolling friction is what comes into play while writing with a ballpoint pen while sliding friction arises when one writes with a pencil.
Skating A thin film of water under the blade is necessary to make the skate slide. The heat generated by the skate blade rubbing against the surface of ice causes some of the ice to melt right below the blade where the skater glides over the ice. This water acts as a lubricant reducing friction.
Lighting a matchstick when the head of the matchstick is rubbed against a rough surface, heat is generated and this heat converts red phosphorous to white phosphorous. White phosphorous is highly inflammable and the match stick ignites. Sometimes, matchsticks fail to ignite due to the presence of water. Water lowers friction.
Driving of the vehicle on a surface while driving a vehicle, the engine generates a force on the driving wheels. This force initiates the vehicle to move forwards. Friction is the force that opposes the tire rubber from sliding on the road surface. This friction avoids skidding of vehicles.
Applications of breaks in the vehicle to stop it Friction braking is the most widely used braking method in vehicles. This process involves the conversion of kinetic energy to thermal energy by applying friction to the moving parts of a vehicle. The friction force resists the motion and in turn, generates heat. This conversion of energy eventually bringing the velocity to zero.
Flight of airplanes Drag is the force that opposes the forward motion of the aeroplane. The friction which resists the motion of an object moving through a fluid or immobile in a moving fluid, as occurs when we fly a kite. The friction of the air is created as it meets and passes over an airplane and its components. Drag is generated by air impact force, skin friction, and displacement of the air.
Drilling a nail into the wall Friction is responsible for fixing of nails in a wall. As the nail is driven into the wall, the nearby material to the nail of the wall gets compressed. This exerts a force on the nail. This force is the friction that converts the normal force exerted by the compressed layers of the wall into the resisting shear force. In this manner the friction cause nails and screws to hold on to walls.
The dusting of the carpet by beating it with a stick- When the carpet is beaten with the stick, the dust comes out. The dust is carried off by the wind or falls on the floor. The carpet exhibits a little static friction that holds the dust to the carpet. When the carpet is beaten, it will overcome the friction and the carpet will move away from the dust making the carpet free from dust.
Sliding on a garden slide- We know that friction is a force that is present whenever two objects rub against each other. In case of a slide in the garden such as a slide and a person’s backside rub each other’s surface. Without friction, a slide would accelerate the rider too quickly, resulting in possible injury due to the fall. The friction reduces the velocity of the sliding person and makes him stop.