Grade 10 Science: Work and Power PDF

LEARNING ACTIVITY ❖ Answer the Learning Activity 1.2: Work and Power ○ Due Date: Sept. 2, 2024 (6:00 PM) v Problem Set 1.1 Coverage will be released today, Aug.27. You may start answering OFFLINE o Deadline to be answered ONLINE is on Week 4 Meeting 2 v Long TEST 1.1 is on Week 4 Mee...

LEARNING ACTIVITY ❖ Answer the Learning Activity 1.2: Work and Power ○ Due Date: Sept. 2, 2024 (6:00 PM) v Problem Set 1.1 Coverage will be released today, Aug.27. You may start answering OFFLINE o Deadline to be answered ONLINE is on Week 4 Meeting 2 v Long TEST 1.1 is on Week 4 Meeting 3  LEARNING ACTIVITY ❖ Answer the Learning Activity 1.2: Work and Power ○ Due Date: Sept. 2, 2024 (6:00 PM) GRADE 10 SCIENCE TOPIC 1.3 When is Work done? TOPIC 1.4 How is Power developed? TEACHER: MR. JRS SANDOVAL, LPT  LESSON OBJECTIVE/S At the end of the lessons, you are expected to: 1. state the operational definition of work; 2. Compute the work done by a horizontal force and a force acting at an angle 3. explain how work is related to power; and 4. Solve problems related to work and power. What have we learned?  In Summary: What is Work? In Physics, work is DONE when… Ø a force is applied to an object causing a motion in the same line of action of the force Ø Work is transfer of energy > when work is done BY a body/system – that body or system loses energy > when work is done ON a body or system- that body or system gains energy Ø Energy is defined as the capacity to do work Who among them is exerting a force? Who among them is able to cause a movement because of the force they exerted?  Is there work done? Is this man doing work on the bag? Is the man doing work on the crate? WORK IS DONE by the force acting on the NO WORK IS DONE ON THE BAG! same line of action of the displacement !  How is work computed? Mathematically….. Ø Work is the product of the magnitude of the The amount of work done displacement multiplied by the component of the force parallel to the displacement when a force acts on a body depends on two things: the size of the force acting on the object the distance through which Joule, J is one of the units of measurement of the force causes the body to work in science; named after English Physicist, move in the direction of the James Prescott Joule(1818-1889) force Work is a scalar quantity. It is Independent of the path.  Sample Problem 1 A horizontal force of 5 N causes a trolley to move a horizontal distance of 3 m. How much work is done on the trolley by the force?  Sample Problem 2 12,000 J of work is done to move a small truck a distance of 80 m. What is the size of the force applied?  Challenge Problem A car with a mass of 1200 kg is moving along a straight road. The car accelerates at a rate of 3 m/s2 over a distance of 50 meters. How much work is done on the car during the acceleration? Answer: W=180,000 J  Work at an angle In many situations, the force and the distance moved are not in exactly the same direction. They are also not perpendicular. Work is done by a force at an angle as seen in the figure below: = Where, represents the angle  Is there a work done? = = 180 =0 Negative work done Positive work done = 90 No work done  Sample Problem 1: Work with angle A person exerts a force of 100 Newtons to push a box across a room at an angle of 30 degrees to the horizontal. If the box moves a distance of 5 meters, calculate the work done by the person. Answer key: w=433.01 J  Sample Problem 2: Work with angle A force of 80 Newtons is applied to pull a cart at an angle of 45 degrees with the horizontal. The force acting at an angle resulted to 565.69 J of work done on the the sled. How far did it move horizontally forward? Answer key: d = about 10 m.  LESSON SYNTHESIS Today, you learned that…  How is power developed? Pertains to HOW FAST YOU DID WORK or TRANSFER ENERGY Walking vs Running (used up your energy or expend) Power – the rate of doing work or how fast work is done  Calculating Power SI Unit Power is defined as the rate at which work is done or the rate at which Since the SI unit of work is energy is expended, or is transferred, joule and the SI unit of or transformed. In equation: time is second, the SI unit of power is Joule/second. This is given a special = name, watt, in honor of James Watt.  REFERENCES Padua,Crisostomo,Rabago.Science and Technology:Physics,2020 “The Physics of Work” YouTube, Physics Video Tutorial Series, https://www.youtube.com/playlist?list=PL3Fs- J5jNT53xmwjC_drtufXFCYNJPFPA; https://www.youtube.com/c/PhysicsclassroomPlus  REFERENCES Other Useful References: UST Library Online Resources: Jove Video https://openstax.org/books/university-physics-volume-1/pages/7-1-work https://openstax.org/books/chemistry-2e/pages/5-1-energy-basics https://openstax.org/books/university-physics-volume-1/pages/7-4-power “Work & Energy”. https://www.youtube.com/c/ProfessorDaveExplains  REFERENCES Padua,Crisostomo,Rabago.Science and Technology:Physics,2020 https://web.njit.edu/~gary/111/assets/Phys111_lecture06.ppt https://www.eia.gov/energyexplained/what-is-energy/ https://www.boyertownasd.org/cms/lib/PA01916192/Centricity/Domain/604/KE%20Energy%20and %20PE%20Energy%20Powerpoint%20no%20equations%20manipulated.pptx