Work and Power:
Work is the result of force applied over a distance.Work= force * distance.
Work is measured in Joules (J).
The image above is an example of work. Although it may not seem like it, work is only present when the force and distance are parallel. Trick Question: If you are going up/ or down stairs do you have work? Yes, You do but the confusing part is which distance you would use because there are two. In this case, one would use the vertical distance.
Power is how quickly work is done. It is measured in Watts which is also Joules/ seconds (joules over seconds). Power is calculated by work/ time (work divided by time).
I horsepower= 746 watts
Powerhouse lab- This lab was conducted for us to find how much power we could generate by running up the stairs.
WORK AND KINETIC ENERGY RELATIONS
Energy is the ability to do work. Kinetic energy is the energy of movement.
Hence, Kinetic Energy is the ability to move.
Work is the change is movement.
Kinetic energy's equation is: 1/2mv^2
Change in kinetic energy=KE(final)-KE(initial)
Note: kinetic energy is the energy something has when moving.
Ed from one of my favorite childhood tv shows is generating kinetic energy because he has velocity and mass as a result his movement is applied to kinetic energy.
Does Taylor Swift have kinetic energy?
She doesn't have kinetic energy because she does not have a velocity. In order for something to have kinetic energy they must have velocity, which she doesn't have.
CONSERVATION OF ENERGY
Why do airbags keep us safe? (in terms of energy not momentum)
1. The car was once in motion meaning it was doing work.
2. kinetic energy=1/2mv^2
3. change in kinetic energy=KEfinal-KEinitial
4. change in kinetic energy=work
5. work=force x distance
6. An airbag increases the distance therefore decreasing the force. POTENTIAL ENERGY
Potential energy is the energy of position. The movement of potential energy can be transferred into kinetic energy.
Note: When something is thrown up, the force of gravity, will cause the kinetic energy to decrease and be transferred into potential energy.
PE=mgh
So how do roller coasters work?Roller coasters are able to work because they store up potential energy that is then converted into kinetic and then back to potential, then back to kinetic, and so on. This means that with height potential energy exist and when height decreases energy is transferred into kinetic energy.The law of conservation of energy. INCLINED PLANES + MACHINESA machine reduces the amount of force by increasing its distance.Ramps are an example of simple machines which are used to reduce the amount of force needed to do move something. By increasing the distance the force is decreased.
Pulleys are another example of simple machines. Note: The tensions on each side of a pulley are equal.
Note: kinetic energy is the energy something has when moving.
Ed from one of my favorite childhood tv shows is generating kinetic energy because he has velocity and mass as a result his movement is applied to kinetic energy.
Does Taylor Swift have kinetic energy?She doesn't have kinetic energy because she does not have a velocity. In order for something to have kinetic energy they must have velocity, which she doesn't have.
CONSERVATION OF ENERGY
Why do airbags keep us safe? (in terms of energy not momentum)
1. The car was once in motion meaning it was doing work.
2. kinetic energy=1/2mv^2
3. change in kinetic energy=KEfinal-KEinitial
4. change in kinetic energy=work
5. work=force x distance
6. An airbag increases the distance therefore decreasing the force. POTENTIAL ENERGY
Potential energy is the energy of position. The movement of potential energy can be transferred into kinetic energy.
Note: When something is thrown up, the force of gravity, will cause the kinetic energy to decrease and be transferred into potential energy.
PE=mgh
So how do roller coasters work?Roller coasters are able to work because they store up potential energy that is then converted into kinetic and then back to potential, then back to kinetic, and so on. This means that with height potential energy exist and when height decreases energy is transferred into kinetic energy.The law of conservation of energy. INCLINED PLANES + MACHINESA machine reduces the amount of force by increasing its distance.Ramps are an example of simple machines which are used to reduce the amount of force needed to do move something. By increasing the distance the force is decreased.
Pulleys are another example of simple machines. Note: The tensions on each side of a pulley are equal.
Note: Scissors have long handles and short blades to allow scissors to cut with more force
EFFICIENCY=workout/workin * 100=
the work out can never be more than the work in
WHAT I FOUND MOST DIFFICULTYet again I was amazed by how confusing and difficult physics is. No matter how much time I put into studying and being attentive, my hard work doesn't seem to pay off.
I struggled particularly the machine section and potential energy. So far the light bulb affect is not coming for me, no matter how hard I try. I attend conference period and it doesn't seem to help. I think I know whats going on and then a test comes and I'm completely wrong. One thing that could help me is just review sessions with my teachers, because when someone ask me if I need help I generally say no.
My problem solving skills got better have gotten better in some cases more than others. I guess by working more on problem solving I will ultimately get better.
My goals for next unit is to do better on quizzes and test, because I've recently scored poorly quizzes. In order to do this, I plan to come in for extra help or more problems so I have more experience grasping the concepts.
My problem solving skills got better have gotten better in some cases more than others. I guess by working more on problem solving I will ultimately get better.
My goals for next unit is to do better on quizzes and test, because I've recently scored poorly quizzes. In order to do this, I plan to come in for extra help or more problems so I have more experience grasping the concepts.
