SPM Physics Paper 2 Section C Answering Technique
Physics
Learning the Answering Technique of the SPM Physics Paper 2 Section C
Okay, now class into this lesson, we are going to learn SPM physics paper two section C okay, now basically in this question is a question, okay? So this is a sample from your textbook page one 6 5. We are going to learn how do we identify other four choices which one is the best option. So the table one shows four toy pistols with different specification. You are required to determine the most suitable toy pistol that can shoot the furthest. So the first thing you do is to underline this. Should furthers. Now, instead of rambling about which one is your best choice, we have to look at study the specification for all four toy pistols from the following aspects. So we are going to do four types of discussions. The first one is the first person of the spring, followed by the compression of the spring, then the density of the plastic dot lastly, the body of the dark.
Okay, so let's do it one by one. So to discuss the first concern of a spring K, we need to make sure that we must have a higher spring constant. Why? Because of this formula, elastic potential energy of a spring is equal to half K, X squared. Now we do know that the higher the K value, the more elastic potential energy it can store. So let's look at all the four choices here. Let's look at the four choices here. The K here. So in order to do this question, first thing you do is to map two highest spring constant. So the first one is P and then Q because they are of the highest value. The next one is to talk about the compression of the spring. Now, looking at this Formula One more time, we do know that the more the spring is being compressed, the higher the elastic potential energy. So for example, if the original length of the spring when it's not loaded is to centimeter, we need to ensure that how much compression is the maximum. Don't be fooled by the number here. It means from two centimeter is compressed until it becomes three centimeter. So the total compression here is actually 9 centimeter. What about the total compression here? The total compression is only cheese centimeter because you only successfully compressed to a centimeter all the way to 6 centimeter. Sorry, so a 6 centimeter, not three centimeters, sorry. So what happens now is that we need to choose two choices that has the highest compression.
The first one is 6 centimeter, 9 centimeter, 9 centimeter, and 6 centimeter. So the following two ticks will be Q and R next we look at the density of the dot. We do know that this is the dot and then this will be projected once the spring load is being released. So basically if we want to make sure that this we have a higher trajectory, the density must be low. So we choose two lower density of the dart here. So basically based on our choices here, we know that the lowest density is Q 8 gram per meters per centimeter cubed. And then the other one is 1.2 grams per centimeter cube, which is R at this stage we found out that Q has three ticks already, P has only one R has two ticks. Lastly, it's the body of the dark. Let's look at the body of the dot characteristic is here. So we have either a smooth body or a rough body. So the dot, we all know that once this dot is being compressed into the pistol, there is a friction in between. The circumference of the dot and the pistol here. So in order for it to be released and without having much friction being lost while it is being projected out, we need a smooth body. So we'll circle two answers with smooth body. Q and S 9. At this stage, we found out that Q is the optimum choice among them all. So after discussing all the characteristics, you must now choose the best material for your pistol and for your dot. And the setup is set up Q so thank you, class. We'll see you again.