Newton's First Law Of Motions Notes
http://www.physicsclassroom.com/Class/newtlaws/u2l1a.cfm
1) State Newton's first law of motion:
An object at rest stays 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.
2) What causes motion to change?
An unbalanced force
3) Ms. Aston decided to buy a hot cup of coffee at her local brewery. Not knowing about Newton's laws of motion, she placed the cup of coffee in her lap and took off. Much to her surprise the coffee spilled and she crashed into the car in front of her. Using Newton's fist law of motion, describe what happened to Ms. Aston's coffee.
When she was in the car, the coffee was still, but when Ms. Aston got in her car and sped up, the coffee did not have sufficient time to increase the speed at which it can be steady, therefore the coffee spilled.
4) Using Newton's first law, describe why we should wear seat belts in our car. Use the animation from the website to help you answer the question.
When the acceleration increases or decreases, we would need something to stop us from that force acting upon us as much, therefore, protecting us.
*Click the "Next section Inertia and Mass" button at the bottom of the website.
5) What is inertia?
The resistance an object has to a change in its state of motion.
6) What force causes objects to slow and stop? What would happen if that force was not applied?
Friction. The objects would go at a constant speed.
7) Are forces required to keep an object in motion? Explain.
No because forces only help the object have positive and negative acceleration.
8) Who has more inertia, Mr. Parraz or Mr. Gollner? Explain your answer.
Mr. Parraz because has more mass than Gollner.
9) Watch video at the end of the website and explain how this proves Newton's first law of motion.
10) Answer questions 1-7 below the video. Try not to click the answer tab until you have thought about it for yourself. Answer each question in your notebook in complete sentences. Make sure and restate the question and the diagram that goes with the question.
1. Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose that you visit that place (just suppose) and throw a rock. The rock will continue in motion in the same direction at constant speed.
2. A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this speed and in this direction?
0N
3. Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the Jell-O with a greater speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with? Explain why.
Tosh, the more mass, the more inertia
4. Supposing you were in space in a weightless environment, would it require a force to set an object in motion?
yes.
5. Fred spends most Sunday afternoons at rest on the sofa, watching pro football games and consuming large quantities of food. What effect (if any) does this practice have upon his inertia? Explain.
Fred's intertia would increase
6. Ben Tooclose is being chased through the woods by a bull moose that he was attempting to photograph. The enormous mass of the bull moose is extremely intimidating. Yet, if Ben makes a zigzag pattern through the woods, he will be able to use the large mass of the moose to his own advantage. Explain this in terms of inertia and Newton's first law of motion.
The moose will have a harder time turning around quickly since it has more inertia
7. Two bricks are resting on edge of the lab table. Shirley Sheshort stands on her toes and spots the two bricks. She acquires an intense desire to know which of the two bricks are most massive. Since Shirley is vertically challenged, she is unable to reach high enough and lift the bricks; she can however reach high enough to give the bricks a push. Discuss how the process of pushing the bricks will allow Shirley to determine which of the two bricks is most massive. What difference will Shirley observe and how can this observation lead to the necessary conclusion?
The brick with the more inertia will resist more, therefore shirley will know which one has the most mass.
11) Click the "Next Section State of Motion" tab and read through the first couple of paragraphs, then watch the video and answer questions 1-2 in complete sentences. Make sure and restate the question and the diagram that goes with the question.
1. A group of physics teachers is taking some time off for a little putt-putt golf. The 15th hole at the Hole-In-One Putt-Putt Golf Course has a large metal rim that putters must use to guide their ball towards the hole. Mr. S guides a golf ball around the metal rim When the ball leaves the rim, which path (1, 2, or 3) will the golf ball follow?
2, because it will follow a straight path
2. A 4.0-kg object is moving across a friction-free surface with a constant velocity of 2 m/s. Which one of the following horizontal forces is necessary to maintain this state of motion?
0N because if the object has a resisting force, it will not be able to keep moving.
1) State Newton's first law of motion:
An object at rest stays 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.
2) What causes motion to change?
An unbalanced force
3) Ms. Aston decided to buy a hot cup of coffee at her local brewery. Not knowing about Newton's laws of motion, she placed the cup of coffee in her lap and took off. Much to her surprise the coffee spilled and she crashed into the car in front of her. Using Newton's fist law of motion, describe what happened to Ms. Aston's coffee.
When she was in the car, the coffee was still, but when Ms. Aston got in her car and sped up, the coffee did not have sufficient time to increase the speed at which it can be steady, therefore the coffee spilled.
4) Using Newton's first law, describe why we should wear seat belts in our car. Use the animation from the website to help you answer the question.
When the acceleration increases or decreases, we would need something to stop us from that force acting upon us as much, therefore, protecting us.
*Click the "Next section Inertia and Mass" button at the bottom of the website.
5) What is inertia?
The resistance an object has to a change in its state of motion.
6) What force causes objects to slow and stop? What would happen if that force was not applied?
Friction. The objects would go at a constant speed.
7) Are forces required to keep an object in motion? Explain.
No because forces only help the object have positive and negative acceleration.
8) Who has more inertia, Mr. Parraz or Mr. Gollner? Explain your answer.
Mr. Parraz because has more mass than Gollner.
9) Watch video at the end of the website and explain how this proves Newton's first law of motion.
10) Answer questions 1-7 below the video. Try not to click the answer tab until you have thought about it for yourself. Answer each question in your notebook in complete sentences. Make sure and restate the question and the diagram that goes with the question.
1. Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose that you visit that place (just suppose) and throw a rock. The rock will continue in motion in the same direction at constant speed.
2. A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this speed and in this direction?
0N
3. Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the Jell-O with a greater speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with? Explain why.
Tosh, the more mass, the more inertia
4. Supposing you were in space in a weightless environment, would it require a force to set an object in motion?
yes.
5. Fred spends most Sunday afternoons at rest on the sofa, watching pro football games and consuming large quantities of food. What effect (if any) does this practice have upon his inertia? Explain.
Fred's intertia would increase
6. Ben Tooclose is being chased through the woods by a bull moose that he was attempting to photograph. The enormous mass of the bull moose is extremely intimidating. Yet, if Ben makes a zigzag pattern through the woods, he will be able to use the large mass of the moose to his own advantage. Explain this in terms of inertia and Newton's first law of motion.
The moose will have a harder time turning around quickly since it has more inertia
7. Two bricks are resting on edge of the lab table. Shirley Sheshort stands on her toes and spots the two bricks. She acquires an intense desire to know which of the two bricks are most massive. Since Shirley is vertically challenged, she is unable to reach high enough and lift the bricks; she can however reach high enough to give the bricks a push. Discuss how the process of pushing the bricks will allow Shirley to determine which of the two bricks is most massive. What difference will Shirley observe and how can this observation lead to the necessary conclusion?
The brick with the more inertia will resist more, therefore shirley will know which one has the most mass.
11) Click the "Next Section State of Motion" tab and read through the first couple of paragraphs, then watch the video and answer questions 1-2 in complete sentences. Make sure and restate the question and the diagram that goes with the question.
1. A group of physics teachers is taking some time off for a little putt-putt golf. The 15th hole at the Hole-In-One Putt-Putt Golf Course has a large metal rim that putters must use to guide their ball towards the hole. Mr. S guides a golf ball around the metal rim When the ball leaves the rim, which path (1, 2, or 3) will the golf ball follow?
2, because it will follow a straight path
2. A 4.0-kg object is moving across a friction-free surface with a constant velocity of 2 m/s. Which one of the following horizontal forces is necessary to maintain this state of motion?
0N because if the object has a resisting force, it will not be able to keep moving.