Momentum

This week we began to learn about momentum. We told that momentum is the movement of inertia, which makes it a vector quantity. This meaning that is has direction and magnitude. We also talked about the Law of Conservation of Momentum, which states that in an isolate system, momentum is conserved. Another element that deals with momentum directly is impulse. Impulse is defined as the change in momentum. Momentum is measured through mass and velocity. The momentum of an object can be found only when you multiply the objects mass by its velocity. My example is my turtle. We are going to say that my turtle is roughly 2 kg, which is kinda heavy for a turtle… I think. Anyway, we are also going to say that its velocity is about 5 m/s, which also may be a little too fast for the turtle. To find the momentum of the turtle we multiply the mass by the velocity. 2 kg x 5 m/s = 10 kg m/s.

Forces that Accelerate

This week we talked about forces that accelerate. Newton’s 2^nd Law tells us that the acceleration of an object is directly proportional to the net force of an object, and the acceleration of an object is inversely proportional to the objects mass. In simpler terms we just have to remember an equation. This equation is Fnet=ma. Where Fnet is the sum of all forces, m is the mass, and a is the acceleration. In previous units we dealt with gravitational pull, which comes into play here as well. The gravitational acceleration is 9.8 m/s². This is important to remember. In this image my moms cousin, and his wife are riding a motorcycle. Simply put if a bug were to hit the bike, the forces would be equal of both objects. This is because the bug hit the bike, and the bike hit the bug. It is an equal force.

Unit 4

Unit 4 we began to talk about Newtons laws. First we talked about force. Force is strength or energy as an attribute of physical action or movement. Then we talked about Newtons Laws. Isaac Newton created 3 laws of motion. The first law of motion or the Law of Inertia states that objects in motion tend to stay in motion unless acted upon by an outside unbalanced force, or the other way around where an object at rest tends to stay at rest. In this photo the volleyball was in motion. However, the ball started at rest. It was only in motion, and only stays in motion because it is being acted upon by multiple outside, unbalanced forces.

Projectile Motion... again

In this chapter we talk about projectile motion. We analyze projectile motion to find position, time of flight, and range. Using knowledge that we have already talked about in the couple previous blogs we use projectile motion for many different problems that we come across. An important rule to remember when using projectile motion is the Vegas rule. “What happens in Vegas stays in Vegas.” The axis are independent. What happens on the x-axis stays on the x-axis. What happens on the y-axis stays on the y-axis. If looking at this picture of the water fall. We could use projectile motion to tell how fast that water is traveling, and how far from the rocks the water falling is hitting the water collected at the bottom.