Mass and Newton's 1st Law

An object at rest stay at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. One example that happens in my own time is when I play basketball with my friends every time I dribble the ball the ball goes on a fast speed because at first it wasn't moving so my force and pressure made it move and bounce around , it shows inertia because I think that inertia is about mass and speed . A other example is when I'm playing volleyball when I spike the ball the pressure of my hand makes the ball go over the net , it shows inertia because of speed. A other example is if you try to pull a table cloth without knocking out what's on top of it, to but the very end on the cloth on the table and then pull it with your two hands very fast if you do it slow it wouldn't work. It shows inertia because it's about weight mas speed. 

Inertia Investigation

Inertia happens in my own time for example , when I'm using my phone I'm not moving but my body cells are and my fingers too because I'm typing etc. Other inertia the happens in my own time is  when I sleeping I staying still but if I have for a example nightmares I going to start moving because of the reaction and imagines that I see in my dreams and if I'm still sleeping im still move why because of my body cells they are still active on less I die. Really everything I do in my own time it with moving because my body cells are active all time , even if you stop moving you're still moving because of you body cells.  

Mu-Friction

I think frictions happens because of the gravity the earth pulls on us . The biggest surface was cardboard , it was like different because we used a box and we didn't use a shoe we used a boat and maybe the boat and maybe the cardboard doesn't attracts one a other. 

Free Body Diagram

My little brother has a bronke leg and his walking on crunshes. When his walking he but's  weight on the crunshes and gravity pulls on him and the crunshes, so you are adding more weight on gravity. 

Balanced and Unbalanced

 A balanced force is when two numbers are the same and equal zero, Ex: if it is at a constant velocity or stationary then the arrows are balanced. A unbalanced force is when two numbers are different and equal to a other number that's it's not zero, Ex: if it is accelerating, then the arrows are unbalanced. 

Salar vs. Vector

Salar: a quantity with only magnitude (or size). Vector: used for force , acceleration , velocity, and other items that need to show a magnitude and direction. Salar and vector are almost the same thing but salar doesn't have force but neither then that they both have the same things in common.