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NEWTON'S LAW AN INCLINED PLANE
Mahidol University International Demonstrate School AP Physics class 2018-2019 Susana Alulod Made by: Phaphat Aowsathaporn
OBJECTIVE - To demonstrate the newton’s second law. - To be able to calculate an acceleration in an incline plane. - To understand more about an incline plane. - To apply Mathematic and Physic together to solve the problems.
INTRODUCTION
There was an scientist in England named Sir Isaac Newton. He has a bad hair style, but quite an intelligent guy. He worked on developing calculus and physics at the same time. During his work, he came up with the three basic ideas that are applied to the physics of most motion. The ideas have been tested and verified so many times over the years, that scientists now call them Newton's Three Laws of Motion. The first law says that an object at rest tends to stay at rest, and an object in motion tends to stay in motion, with the same direction and speed. Motion (or lack of motion) cannot change without an unbalanced force acting. If nothing is happening to you, and nothing does happen, you will never go anywhere. If you're going in a specific direction, unless something happens to you, you will always go in that direction. Forever. The second law says that the acceleration of an object produced by a net applied force is directly related to the magnitude of the force, the same direction as the force, and inversely related to the mass of the object; F = ma. The third law says that for every action force there is an equal and opposite reaction force. Forces are found in pairs. For example, if object 1 exerts a force on object 2, then object 2 experts a force back on object1, equal in strength but in the opposite direction. In this experiment, we did about an incline plane to find an acceleration by using two different equation. There were s = ut + (at^2)/2 and a = g sinθ.
MATERIALS 1. cart
2. track
3. Stop watch
4. Ruler
5. stand
SET UP
PROCEDURE 1. Set up the ramp with the height 25 cm at the end of the ramp(start with 0 cm side) by using the ramp stand. 2. Make sure that distance along the ramp at 140 cm the height is 13 cm. 3. Starting with a cart at rest at the distance 20 cm, use the stopwatch to measure the time to roll down the ramp. 4. When the cart passed the distance of 80 cm, press the stop watch(Lab). 5. When the cart passed the distance of 140 cm, press it another time. 6. Record the time we used. 7. Repeat step 3-6 for three time and average them.
DATA & RESULT 1. Finding the angle
cm
2. Finding the acceleration by using newton's second law equation
3. Finding the acceleration by using linear motion equation
1. Newton's second law equation
2. Linear motion equation
Analysis In the calculation part, there are two different equations that be used to calculate an acceleration of the cart, which is Newton’s second law equation and Linear motion equation. As you can see in the calculation part, a mass of a cart is independent from an acceleration. They are not related. As the result, an acceleration from Newton’s second law equation is 0.98 m/s^2 in the first 60 cm. At the same distance (first 60 cm), an acceleration from a linear motion equation is 0.94 m/s^2. There is an error in this experiment, which is human error. It can happen when the observers are in a different position. It may cause the effect to the time we took. Furthermore, when the observer presses a stopwatch button, the time isn’t accurate. So, I have to do many trials and average it. At the distance of 120 cm, an acceleration of the cart is 0.98 m/s^2 by using Newton's second law. And from a linear equation, an acceleration is 0.85 m/s^2. Also, there is a mistake that causes acceleration not to be the same, which is human error. Without a human error, an acceleration should be the same.
Conclusion To conclude, an acceleration of a cart that slides down an inclined plane is independent from a mass of the cart. From the equation, a = g sinx, it shows that no mass needed to plug in the equation. Thus, the only thing that needs to be measured in this experiment is height and the distance of an inclined plane to find an angle of it.
Reccommendation There is a mistake that make an experiment isn't become accurate, which is about human error. In this experiment, it is a group work. So, our group have many observer from a different position that makes a mistake about timing. Because we saw the cart in different perspective. However, we solve this problem by using only one observation who was standing in front of a distance at 120 cm because it will be the most accurate one to see the cart pass the point.
References - (n.d.). Retrieved from https://study.com/academy/lesson/inclined-plane-lessonfor-kids-definition-examples.html - Inclined plane facts Kids Encyclopedia Facts. (n.d.). Retrieved from https://kids.kiddle.co/Inclined_plane - E. (n.d.). What is an inclined plane simple machine. Retrieved from https://eschooltoday.com/science/simplemachines/what-is-an-inclined-plane.html - Inclined Plane Examples. (n.d.). Retrieved from http://www.softschools.com/examples/simple_machines/i nclined_plane_examples/508/
Mahidol University International Demonstrate School AP Physics class 2018-2019 Susana Alulod Made by: Phaphat Aowsathaporn
OBJECTIVE - To demonstrate the newton’s second law. - To be able to calculate an acceleration in an incline plane. - To understand more about an incline plane. - To apply Mathematic and Physic together to solve the problems.
INTRODUCTION
There was an scientist in England named Sir Isaac Newton. He has a bad hair style, but quite an intelligent guy. He worked on developing calculus and physics at the same time. During his work, he came up with the three basic ideas that are applied to the physics of most motion. The ideas have been tested and verified so many times over the years, that scientists now call them Newton's Three Laws of Motion. The first law says that an object at rest tends to stay at rest, and an object in motion tends to stay in motion, with the same direction and speed. Motion (or lack of motion) cannot change without an unbalanced force acting. If nothing is happening to you, and nothing does happen, you will never go anywhere. If you're going in a specific direction, unless something happens to you, you will always go in that direction. Forever. The second law says that the acceleration of an object produced by a net applied force is directly related to the magnitude of the force, the same direction as the force, and inversely related to the mass of the object; F = ma. The third law says that for every action force there is an equal and opposite reaction force. Forces are found in pairs. For example, if object 1 exerts a force on object 2, then object 2 experts a force back on object1, equal in strength but in the opposite direction. In this experiment, we did about an incline plane to find an acceleration by using two different equation. There were s = ut + (at^2)/2 and a = g sinθ.
MATERIALS 1. cart
2. track
3. Stop watch
4. Ruler
5. stand
SET UP
PROCEDURE 1. Set up the ramp with the height 25 cm at the end of the ramp(start with 0 cm side) by using the ramp stand. 2. Make sure that distance along the ramp at 140 cm the height is 13 cm. 3. Starting with a cart at rest at the distance 20 cm, use the stopwatch to measure the time to roll down the ramp. 4. When the cart passed the distance of 80 cm, press the stop watch(Lab). 5. When the cart passed the distance of 140 cm, press it another time. 6. Record the time we used. 7. Repeat step 3-6 for three time and average them.
DATA & RESULT 1. Finding the angle
cm
2. Finding the acceleration by using newton's second law equation
3. Finding the acceleration by using linear motion equation
1. Newton's second law equation
2. Linear motion equation
Analysis In the calculation part, there are two different equations that be used to calculate an acceleration of the cart, which is Newton’s second law equation and Linear motion equation. As you can see in the calculation part, a mass of a cart is independent from an acceleration. They are not related. As the result, an acceleration from Newton’s second law equation is 0.98 m/s^2 in the first 60 cm. At the same distance (first 60 cm), an acceleration from a linear motion equation is 0.94 m/s^2. There is an error in this experiment, which is human error. It can happen when the observers are in a different position. It may cause the effect to the time we took. Furthermore, when the observer presses a stopwatch button, the time isn’t accurate. So, I have to do many trials and average it. At the distance of 120 cm, an acceleration of the cart is 0.98 m/s^2 by using Newton's second law. And from a linear equation, an acceleration is 0.85 m/s^2. Also, there is a mistake that causes acceleration not to be the same, which is human error. Without a human error, an acceleration should be the same.
Conclusion To conclude, an acceleration of a cart that slides down an inclined plane is independent from a mass of the cart. From the equation, a = g sinx, it shows that no mass needed to plug in the equation. Thus, the only thing that needs to be measured in this experiment is height and the distance of an inclined plane to find an angle of it.
Reccommendation There is a mistake that make an experiment isn't become accurate, which is about human error. In this experiment, it is a group work. So, our group have many observer from a different position that makes a mistake about timing. Because we saw the cart in different perspective. However, we solve this problem by using only one observation who was standing in front of a distance at 120 cm because it will be the most accurate one to see the cart pass the point.
References - (n.d.). Retrieved from https://study.com/academy/lesson/inclined-plane-lessonfor-kids-definition-examples.html - Inclined plane facts Kids Encyclopedia Facts. (n.d.). Retrieved from https://kids.kiddle.co/Inclined_plane - E. (n.d.). What is an inclined plane simple machine. Retrieved from https://eschooltoday.com/science/simplemachines/what-is-an-inclined-plane.html - Inclined Plane Examples. (n.d.). Retrieved from http://www.softschools.com/examples/simple_machines/i nclined_plane_examples/508/
