Today we discussed a little more about Net Force and I think everyone is on the same page now and understands the total amount of force exerted on an object is the net force. Also, the direction of the larger force is the direction the object will move. Like we did in class today with the stick, the image below of people playing tug-o-war where there is equal force on each side is an example of a balanced with the net force = 0 N.
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| Photo courtesy of http://www.tutorvista.com/content/science/science-i/force-laws-motion/balanced-unbalanced.php |
The second part of class we looked at speed and how to go about calculating it when you are given certain information. Below is an awesome website that has animations explaining a whole lot of things relating to Physics, this link deals with speed specifically.
Just so everyone is on the same page - speed and velocity are sometime interchanged in Physics class. The biggest difference to note is that velocity just refers to speed in a certain direction. The formula for calculating speed (or velocity) is...
When working through a problem you should always write down what you know and what you are trying to find. Let's do 1 problem together -
Ronny is going from their home to the Bears game at Soldier Field. Ronny is walking at 3.55 km/hr and it takes him 2.5 hours to get to the game. How far is soldier field from his house?
First we write down what we are trying to find. Since "How far" is asking us a question about distance, that is what we will be solving for - D.
That then means that in the somewhere in the problem they must give us the speed and time. Since we know that a measure of time is hours, 2.5 hr would be our time. This leaves only 3.55 km/hr to be our speed.
Using that information - 3.55 km/hr = D / 2.5 hr. To solve for D, we then multiply each side by 2.5 hr giving us the answer of 8.875 km.
For homework, you are supposed to complete the five circled questions on the back of the worksheet. See you tomorrow.
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