1) Define what reflection and refraction are and explain how they are different.
Reflection: When a light hits an object and it bounces off, e.g Mirror. Refraction: When a light speed up when it hits a substance, it moves away from the normal and changes direction. 2) What are the primary colors of light? Red, green, and blue. 3) What happens to light when it hits a black surface? Black objects absorb almost all of the light that hits them. They do not reflect any colors of light. 4) What happens to light when it hits a white surface? A white object reflects all the colors in white light. 5) What happens to light when it hits a red surface? When light hits a red object, the object absorbs or takes in all the colors in the light except red. The object looks red because it reflects or bounces back the red light. 1) Define the following: Amplitude, Frequency, Wavelength, Crest, Trough
Amplitude: Measure of the displacement of the wave from its rest position. Frequency: The number of times per second that the wave cycles. Wavelength: Distance between 2 points. Crest: Highest point. Trough: Lowest point. 2) What are the differences between light and sound waves? Sound waves: 1. Require a medium. 2. Travel with a speed of 332 m/s at 0 C. 3. Are longitudinal waves consisting of compressions and rarefactions. 4. Are of different frequencies, giving notes of different pitches. 5. Do not travel far as their energy is dissipated easily. Light waves: 1. Do not require a medium 2. Travel with a speed of 3*10^8 m/s. 3. Are electromagnetic waves consisting of varying electric and magnetic fields. 4. Are of different frequencies, resulting in different colors. 5. Can travel through a much greater distance. 3) How fast is the speed of light in m/s? Is this the fastest thing in the universe? 300,000,000 m/s, yes. 4) How fast is the speed of sound in m/s? Do you think that this is very fast? Why/why not? 343 m / s at 20 c. It's not very fast if you compare it to the lights. 1) List as many electrical devices as you can that you use in your house and everyday life.
Phone, laptop, air conditioner, room lights, television, refrigerator, rice cooker, showers, and etc. 2) Which devices from the first question do you think require lot of electricity? Which ones do you think do not require a lot of electricity? air conditioner require lot of electricity, while phone does not require a lot of electricity. 3) List electrical devices from your life that you think are energy efficient and explain why you think they are. My phone and laptop are energy efficient, because I only need to charge when it runs out of power. While other electricities, needed to be plug in every time. 4) Is there anything you do to conserve energy (electricity) in your everyday life? Why/why not? Use electrical devices wisely, so we can conserve energy in our everyday life. 5) Make a list of at least 4 ways that you and your family could conserve energy (electricity) in your home. - Turn off lights when we don't use it. - Turn off AC when we don't use it. - Turn of water when we have done using it. - Unplug dispenser when we don't use it. Voltage is an electric force that helps electricity move from an atom to another. Every atom has its own electrons. When the electrons are flowing, there is always an electric force pushing them along. Given a voltage and a path for the electrons, then the current will flow. The current can be found from ohm’s law, V = IR. The V is battery voltage, so if the resistance (R) can be determined, then the current can be calculated. The units for voltage is volt. Electrical devices are designed to operate on a particular voltage. For example, a light bulb will operate below the voltage stamped on it, but the light will have a low intensity.
An electrical current is the flow of electric charge. The charge is often called by mocing electrons in the wire. The unit of current is ampere, we can find it out by using a digital multimeter. First, determine the amperage rating. Second, select the correct function. Third, set the max range. Fourth, plug the cord into the correct terminal. Lastly, run the circuit/wire through the multimeter to measure the current. Ohm’s law states that the electrical current flowing in a circuit is equal to the voltage and inversely porpotional to the resistance. Therefore if the voltage increases, the current will increases as well and the other way around with resistance. Reistance is an electrical device which could increase or decrease the current of an electricity flow. Resistance applies to electricity as it acts as a “controller” to manage the amounts of electrical current going through the wire. It is important to adjust the current because if it’s too strong, something might explode. Resistance is measured in Ohm’s, the greater the number of Ohm’s, the greater the resistance. One of the example is when electric current is passed through the electric bulb, the gilament of the bulb is getting heated and it will make a light it happens because of the heating effect of electric current. 1) Where do you think electricity comes from?
Electricity comes from the energy that is being produce by the electricity company. I think electricity comes from magnet and energy. 2) What do you think voltage means? Voltage is the tension of electricity. 3) What do you think resistance is? Resistance is the obstacle or barriers of electricity. 4) What do you think electrical current is? Electric current is the flow and pathway of electricity. 5) Have you ever heard of Ohm's Law? What do you think it is? I think Ohm's law is the law of someone who invented electricity. 6) What is the voltage and current of your laptop? Do you know how to find out? I dont know because I dont know how to find out. 7) Do you know the difference between an insulator and a conductor? I used to know the difference, but I forgot. 8) Do you know the different parts of an atom? If so please explain what they are. I think atom have billions of different parts, but I dont know what they are. 1) Give an example of how you contributed ideas to improve the quality of your group’s work in a project you did this term.
I contributed ideas to participate in a group discussion in order to develop and innovate new ideas to be applied in the project. For example, I help my group to decide what topic should we discuss in our presentation. 2) Give an example of how you motivated others to achieve the group’s goal in a project you worked on this term. I motivated others to achieve our group’s goal by reminding them to do their job, so that we can finish our work on time. Energy Presentation Reflection
1) Do you think your group did a good job on your energy power point presentation? Why/why not?Yes, because we are able to create a short but detail presentation that are able to educate our friends. Besides that, for me our presentation is very easy to understand. 2) Do you feel that you have a good understanding of the law of conservation of energy? Why/why not? I do feel that I have a good understanding of the law of conversation of energy, because I was able to conclude my own information and understand the details after I do my research. 3) Do you feel that everyone in your group collaborated well? Why/why not? We collaborated very well because we are able to finish our work on time, with a great teamwork that creates a good presentation with good details. 1) Describe the difference between mass and weight
Mass: The quantity of matter which a body contains, as measured by its acceleration under a given force or by the force exerted on it by a gravitational field. Weight: The force exerted on the mass of a body by a gravitational field. 2) Explain Newton's 3 laws of motion in your own words 1: The law of inertia. An object at rest will remain at rest unless acted on by an unbalanced force. 2: The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). 3: For every action there is an equal and opposite reaction. 3) Give 2 examples of Newton's laws of motion in everyday life
4) Do you have any questions about Newton: No MR! Newton's First Law:
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