elastic and inelastic

Elastic collision is when two things bounce back off of each other and inelastic is when two things dont bounce off of each ither because they have the same mass. One elastic collision is when you have a small guy bounce off a big guy. One inelastic collision is when two things with the same mass bump into each other.

elastic collisions

A skateboard because it is moving and it has move work and power because it is in motion which
makes it have more momentum.

work vs power

Work is a applied force and power is the rate in which work is being done. One example of more power is when you run up the stairs and one example of less power is when you walk up the stairs.

Mass and Newtons first law

  One example is when there is a car moving and it pushes into a wall because something is stopping the car. Another example is when you have a small guy running into a big guy because something is stopping it from going. Last example is when you have a ball thrown and the ball is stopped by someones hand. The amount of mass affects this though because the more mass something has the faster it stops and the harder is is to stop.

Inertia Investigation

I see inertia when you have a cup, a coin and a index card and you try to get the coin in the cup by moving the index card. Also when you are running and you drop a ball and try to make it land on the x while running. Also when you have 5 poker chips and hit the bottom one and see what happens. One example of things that don't stop moving are clouds because there is nothing in the air to really stop them. One example of one thing moving and the other staying still is when you have two cars and they push in to each other because one car has a larger force and there is more mass on that one car.

Mu-friction

Friction happens because you rub things together and there is energy. Friction also happens because two different types of energy's are meeting each other and are making bad things happen. I think grass or wood would have a greater amount of friction because there is more energy in those two things. 

balanced and unbalanced

Reference https://www.physicsforums.com/threads/drawing-free-body-diagrams.458441/

These are two free body diagrams the picture is balanced and the link is not. You know if they are balanced because the lines are the same length or they are the same numbers. But you can tell if they are unbalanced if the lines are uneven or they have different numbers.

free body diagrams

This object can be a basketball. The basketball has a applied force when someone is using it or bouncing it. There is always a gravitational force on everything because something is always gonna pull down. There is a normal force because it will come back up when you move your hand because it bounces. Lastly there is a friction force because when the ball rolls on the ground there is a force between the floor and the ball. 

vector vs. scalar

The difference between vector and scalar is with scalar you use speed, time, distance and mass. With vector you use velocity, acceleration, displacement, force and weight. The big difference between vector and scalar is that vector quantities are used for force, acceleration, velocity and other items that need to show a magnitude and a direction. Scalars are a quantity with only magnitude. A example of a vector is displacement and an example of scalar is time.

four forces

The four forces are applied force, normal force, tension force and gravitatational force. Applied force is just how it sounds you applie an amount of force on an object. Normal force is when you have a normal force from an object going up. Tension force is when there is two object that are going at each other with the same force and go against each other. Gravitatational force is how it sounds as well it is when you have a force pulling down on an object.

acceleration

An example of acceleration is when a car goes in reverse and they pick up in speed 10 times more that is an example of acceleration because you are changing direction and changing speed.

GUESS

The GUESS method is a method used to solve equations. the G means to say the given. like whats given to you in the equation. The U means to give the unknown. whats unknown in the problem that you dont know . the E is to make an eqation. The first S is to substitute. this means to use what u already know to put into the equation. the last S is to solve the equation. 

Distance vs. Time

We were given these motion dective things and we hooked them up to the computer and detected or motion when we moved. I think these would be good in science class because you can use ut when you want to see how someone

or something got somewhere.

Distance vs. Displacement

Distance is from going to one point to another on a graph or on just in general when you are walking or running or going anywhere. Displacement is the difference from one point to another point on a graph or in general once again. One thing I saw in class was on the time line when we went from one point to another and. when we counted the distance from 0 to the next #.

Barbie Bungee Data Estimates

I think barbies distance for 10 rubber bands would be close to 130 cm and for 20 rubber bands close to 165 cm and for 30 rubber bands close to 200 cm or more. I got these numbers by looking at my lab sheet from today and seeing that if you add 10 and 20 and 30 rubber bands to the 8 we already had these are close to the numbers that came out.

Metric Units

I think that we use metric in science class because they are a lot easier to use and there are not as many so they ate easier to remember. 

1. A cup

2. Milk

3. Juice

Estimating Distances

I estimated that the length of the front of my house is 32 feet. I did this by measureing my rip-stick and remembering where I placed it so I could keep doing that the whole way. I think this is a reasonable estimate because my house is pretty big and so is guess for what the length of my house is.

Reaction time

Reaction time is when someone or something does something and how long it takes you to react to what is going on. 

1. Im my own life i have expericed that I tend to go slower when I am worried about something and when something bad is going on. 

2. Also I tend to do things faster when i think something  is gonna happen and when I am aware of what is happening in life and with my family.

3. I tend to do things differently and it depends on what I am doing and what people are doing around me and how I am feeling with things.