IP PHYSICS

[lukeypotatoes]

Here is a simple picture of the one they call “THE HAWK” hunting with his bow and arrow. This bow has a lot of potential energy stored with it. There is also Gravitational Potential energy which is the work that was required to elevate the object against gravity. The formula of that is PEg=mgh. Potential energy and kinetic energy both play important roles with each other.

[vmart95-blog]

This is a great example of potential energy that we might no think about when we first see a bow and arrow. Kinetic energy is also shown in the conversion of PE to KE when he lets go of the arrow.

[vmart95-blog]

Here is a video of different types of energy at work in a cartoon.

[vmart95-blog]

Friday in class we had a lab that included pulleys and weights. The lab was to determine if with the use of more intricate pulleys (more string moving about pulleys) what is the relationship between the effort distance and resistance distance. The more intricate the setup, the less effort distance and the more resistance distance.

[vmart95-blog]

Potential energy

This week we learned about potential energy. Some of these things are:

Potential energy is the energy stored in position

it is energy in a stored state

there are different types of potential energy, such as chemical energy, which is energy stored in bonds of molecules

PE depends on the weight and height of its object

[lukeypotatoes]

Wednesday Posting

On Wednesday we started talking about the types of collisions we might see. Two collisions we talked about are Elastic and Inelastic collisions. An elastic collision is one where 2 objects collide and bounce apart with no less energy and the object retain their original shapes. An inelastic collision is a collision in which objects collide and some mechanical E transformed into heat and object deform in the collision and do not return to their original shape. 

[vmart95-blog]

An example of an elastic collision is a tennis ball hitting a wall and bouncing back. An example of an inelastic collision is play-doh hitting the wall, deforming, and not bouncing back. Good job Luke.

[vmart95-blog]

Elastic and inelastic collisions

in an elastic collision, objects bounce apart with no energy loss and objects may deform when force is applied but will return to original shape. In Inelastic collisions, objects collide and some energy is turned into heat. The objects will deform and not return back to shape.

[vmart95-blog]

This week in physics

we learned several facts about impulse

it is the product of force and a time interval that acts upon it

impulse= (force) x (elapsed time)

if impulse is increased, change in momentum is increased

[vmart95-blog]

In class this week we learned about impulse.  Impulse is a change in momentum.  An equation to find the impulse of an object is J=FΔt.  In baseball if you decrease the contact time between the bat and the ball during a bunt, you will create a small impulse.  But, if you swing and hit a homerun the contact time will between the bat and the ball will be longer, therefore creating a greater impulse.

[vmart95-blog]

In this video, the conservation of momentum is present in all hits and collisions seen. Momentum is transferred between and acts on all objects and people hit.

[pattylight25-blog]

11-27-11

Here is a really great example of a change in momentum, and a pretty big one. The rapid change causes the players helmet to pop right off of his head which is impressive but also strange how a human with not such a great mass can inflict this kind of energy change, enough to cause the other players hemet to come right off.

[vmart95-blog]

This is a great picture of you hitting that guy Pat. Also it is a good example of a change in momentum as you said.

[vmart95-blog]

This picture shows the conservation of momentum. Momentum is seen with the cannon ball being shot forward, and also with the cannon moving backwards. There is no momentum lost in the picture and it is distributed between both objects.

[vmart95-blog]

This week in physics, we observed a short presentation by B Fay demonstrating what happens when he throws a bowling ball while standing on a skateboard. This showed the conservation of momentum as when the ball was thrown one way, Bryan started rolling in the opposite direction.

[ipphysics-blog-blog]

The famous newton cradle is a great example of how both energy and momentum are conserved in a collision. I was always fascinated by this invention when I was a child but I now understand how it works thanks physics! 

[vmart95-blog]

This is an interesting way to show the conservation of energy and momentum. I also did not know what this mechanism represented for a good amount of time but it is good to know now with out lesson on momentum.

[vmart95-blog]

Friday we learned..

Friday we learned more about momentum and also about kinetic energy, which is 1/2 mv squared. We used several equations to find out different variables in different collision situations, which varied in masses and velocities. We also observed what would happen in a collision with no elasticity compared to one with elasticity. The difference was there was no rebound, or bounce back in the no elasticity collision.

[vmart95-blog]

Today we learned about momentum. Momentum is 'moving inertia' and an object's momentum is the product of its mass and velocity. Momentums equation is p=mv and its si unit is kg x m/s. An example of 2 objects involved with momentum is a baseball and a bat. The bat hits the ball, giving the ball momentum to move the same direction as the bat is swung. If the bat breaks, its momentum keeps it moving in the direction as it was swung as well.

[vmart95-blog]

Monday and Tuesday we reviewed Kepler's laws and Gravitation for our exam Wednesday. The most important equation we went over was F=G(m1m2/(r squared)). F represents force of gravitation, G represents the gravitational constant, in this case 6.67x10 to the -11th, m1 and m2 represent the 2 masses, and r represents the radius. The picture represents Kepler's 2nd law which shows how all the areas are travelled at the same amount of time.

[pbnswellyswag-blog]

[vmart95-blog]

pbnswellyswag:

This week we learned about gravitation.  This says that the force of attraction between two objects must be proportional to the masses.  This is known as gravitational force.  This can also be displayed through the universal law of gravitation.  The universal law of gravitation is F=G(m1m2/d^2).  This law shows that the mass of an object can be directly related to the force of an object.

This picture makes it easy to understand the variables in the equation. The usual units for the variable are [N]=(Nm2/kg) x (kg1kg2/m2)