Question.3683 - Go to the University of Colorado Boulder website and select the Forces and Motion simulation (https://phet.colorado.edu/en/simulation/legacy/forces-and-motion). You can activate it right in the window by clicking on it. You can also download to your computer if you wish. This is an older application and it may not be possible to exactly reach certain values. Just get as close as you can. Start in the Introduction tab. You will apply forces to this small crate to get it to move. You can do so by clicking and holding while pulling the box OR by clicking and holding the applied force slider. Set the box position to 0.0 meters. Make sure Force Vectors box is selected. Apply a force, Fa, to the right. Is it positive or negative? Then do the same for the left direction. On the right it is positive and, on the left, it is negative. Do the normal or gravitational forces change based on how much force you apply? Does the friction force? I believe neither the normal force nor the gravitational force changes based on how much force is being applied to the box; but certain frictional force tends to play a role based on the applied force as it directly depends on the normal force. Apply around 200 N of force to the right. Then do the same to the left. Does friction care which way youre pushing from? What happens no matter which direction you choose? I believe, due to the flat surface on either side and all the mass being the same, no friction might not care which the box is being pushed from, but it always acts in the opposite direction of the applied force. What magnitude of pushing force is needed to move the crate? What happens to the friction force just before and just after it starts to move? Approximately 490 N is needed to move the crate, the friction force will be equal to the applied pushing force and after the movement of the box I believe the frictional force will experience a drop, becoming kinetic friction as the box eventually transitions to sliding friction.? Which requires a larger force: starting the crate moving or keeping it moving? Why? (Hint: I briefly mentioned this in the first chapter 5 lecture.) The starting requires larger force due to static friction acting on the box opposing the movement. Select the Sum of Forces box. The sum appears in green above the crate. Push the crate until it starts moving again. What is the sum just before and just after is starts moving? (Dont need a value for the after case, just describe the vector. The sum of forces is in the direction of the applied forces when the object starts to move, but before the box moves, the sum of forces is be zero. Bring the crate against one wall and push it the other way enough that it keeps moving even after you let it go. While the crate is still moving is there still a net force? If so, what is it and what does it cause the crate to do? Even after I stop applying the force on the box, there is movement while due to kinetic force acting on it, the box experiences deceleration. On the bottom select the down arrow next to the small crate and select the file cabinet. What force is needed to move this object? How does it compare to the force to move the crate? What is different about the two objects that makes this happen? Approximately 245 N is needed to move the file cabinet, nearly half the force is needed which is proportional to the mass of the object too, since the crate was 100 kg and file cabinet is half the weight of crate, which is 50 kg. Now switch to the sleepy dog object. Compare the force it needs to move to the crate and file cabinet. Does that make sense with what you said in #9? If not, find a new trend for the forces required to move these objects. Approximately 126 N is needed to move the dog when compared to the weight of the?crate and file cabinet the sleepy dog weighs only 25 kg 75% less the weight of the?crate and half the weight of the file cabinet which can easily be seen in the force required to push the object. Swap to the textbook object and find the force needed to move it. Does this fit your trend? Approximately 40 N is required to move the object and yes it fits the trend wherein weight of object being proportional to applied forces, while static and kinetic friction acting on the object before and after applied forces act on it. Note the difference between the normal and gravitational forces on each of these objects youve gone through. Why do they change? How might it relate to the forces needed to move the objects? Due to the differences in the object's weight of the object, the applied force also varies, and the gravitational force remains consistent for all the objects. I believe by utilizing Newtons 2nd law of motion, we can draw a relationship between?forces and the force needed to move an object; implying that net force acting on an object is equal to its mass times its acceleration. Go back to using the crate and under Friction set it to Ice (no friction). Now what force is needed to move the box? Is this different for any other object? Due to?no static friction on the surface, it only requires 22 N to move the object on the icey surface when compared to the previous acting static friction that required around 490 N to move the object. Set the Walls option to Bouncy. After you get an object moving on the ice (use a large force, try to reach a high speed), how long does it take for the object to stop moving? due to bouncy wall with elastic potential energy stored in the collision with the wall that converts kinetic energy back and forth propelling the object, so it will take a longer time to stop the object Swap to the Robot Moving Company tab. In this game try to deliver all three objects to the door while saving the robots energy. When youve completed a round of safely delivering all 3 objects, tell me what your score is.
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