What science ideas did you learn?
This week we learned about Newton's third law- which is when two objects collide, the force that is exerted on both objects is the same in magnitude and they both move in the opposite direction.
How did you learn these ideas?
We discussed and did an experiment. We saw Laura and Kathy both sitting on carts in the opposite directions, facing each other. Kathy pushes Laura's knees as hard as she can and Laura moves. Kathy moves as well. This means that Laura must have pushed Kathy too. This proves that Newton's third law is correct.
Why is it important to know this idea ?
It is important to understand Newton's third law because we should know what happens when someone is pushed and why the other person who is the pusher moves too.
Saturday, December 19, 2009
Friday, December 11, 2009
Force
What science ideas did you learn?
This week we learned more about force and how to draw force diagrams. We where given a lot of different situations and had to draw force diagrams for them. We also learned that your weight changes when you stand on a scale in a moving elevator. This week we also learned how mass and weight are similar and different. Mass is the property of an object and weight is a force.
How did you learn these ideas?
We learned these ideas by discussing as a class, talking in our table groups, and by experimenting. We talked within our table groups about our theories of force and then we discussed as a class how it actually works. We then preform an experiment to prove our hypothesis is correct.
Why is it important to know this idea?
It is important to understand this idea of force because we should know why we are able to stand on the earth. We should know that if you travel to the moon or a smaller planet that you could be flying in the air because there is now gravity or force to pull you down to that planet.
This week we learned more about force and how to draw force diagrams. We where given a lot of different situations and had to draw force diagrams for them. We also learned that your weight changes when you stand on a scale in a moving elevator. This week we also learned how mass and weight are similar and different. Mass is the property of an object and weight is a force.
How did you learn these ideas?
We learned these ideas by discussing as a class, talking in our table groups, and by experimenting. We talked within our table groups about our theories of force and then we discussed as a class how it actually works. We then preform an experiment to prove our hypothesis is correct.
Why is it important to know this idea?
It is important to understand this idea of force because we should know why we are able to stand on the earth. We should know that if you travel to the moon or a smaller planet that you could be flying in the air because there is now gravity or force to pull you down to that planet.
Saturday, December 5, 2009
First Week of Force
What science ideas did you learn?
This week we ended our unit on motion, and we started learning about force. We first talked about gravity and where we can and can't find it. On earth there is gravity, yet in space, there is no gravity. We learned that gravity or the earth's pull forces objects down. For example, when you throw a ball up in the air, it is pushing against gravity, going upward. The earth's pull then brings the ball back down to your hand. We also learned that objects, such as a table gives off force. You can sit on a table, stand on a table, and push against a table without falling. We also talked about force diagrams and started to create them. This week we also learned about how much force you may use when you hold something lighter, like a basketball, compared to something heavier, like a bowling ball. When holding the bowling ball you use more force than with holding the basketball.
How did you learn these ideas?
We talked about these ideas as a class and came up with experiments. We experimented how much force you would use with a bowling ball and a basketball. We also experimented the concept of force another way, by going outside and pushing Mr. Finley's car. We also created force diagrams for many different situations through out the week.
Why is it important to know this idea?
It is important to understand these ideas about force because we should know how gravity, and how the earth and other objects affect the way things are. We should also understand why you may use more force with one object and use less force for another. It is important to know that every solid object gives off force such as a table or a piece of paper.
This week we ended our unit on motion, and we started learning about force. We first talked about gravity and where we can and can't find it. On earth there is gravity, yet in space, there is no gravity. We learned that gravity or the earth's pull forces objects down. For example, when you throw a ball up in the air, it is pushing against gravity, going upward. The earth's pull then brings the ball back down to your hand. We also learned that objects, such as a table gives off force. You can sit on a table, stand on a table, and push against a table without falling. We also talked about force diagrams and started to create them. This week we also learned about how much force you may use when you hold something lighter, like a basketball, compared to something heavier, like a bowling ball. When holding the bowling ball you use more force than with holding the basketball.
How did you learn these ideas?
We talked about these ideas as a class and came up with experiments. We experimented how much force you would use with a bowling ball and a basketball. We also experimented the concept of force another way, by going outside and pushing Mr. Finley's car. We also created force diagrams for many different situations through out the week.
Why is it important to know this idea?
It is important to understand these ideas about force because we should know how gravity, and how the earth and other objects affect the way things are. We should also understand why you may use more force with one object and use less force for another. It is important to know that every solid object gives off force such as a table or a piece of paper.
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