Table Of Contents PHS 100-552 Lab Part I: Scenario H Graph……………………………………………… 2 Scenario H Regions and Force Diagrams……………………………. 3 Region and Force Diagram Information……………………………… 4 Part II: Graph 6 …………………………………………………………. 5 Step-By-Step Instruction……………………………………………….. 6 Regions and Force Diagrams……………………………………………7 Region Information………………………………………………………. 8 Newton’s Laws…………………………………………………………… 9 Self-Assessment………………………………………………….. …….. 10 Scenario H You are stopped at a stop sign. Your friend pushes your car forward at an increasing velocity for two seconds.
She then pushes your car for three more seconds at a constant velocity. Your friend stops pushing and you immediately apply the brakes for one second, but do not come to a stop. Regions and Force Diagrams Graph #6 Step-by-Step Instruction Regions and Force Diagrams Region Information Region A Region B Region C Region D Region E The cart remains still for 2. 6 seconds 0. 7 meters away from the sensor. Net force equals zero. All three graphs show the cart is stationary with a flat line across the 0. 7 line. Acceleration graph begins sloping negatively once the force of hand is applied.
After 2. 6 seconds the cart is pushed towards the sensor until it reaches 0. 2 meters. At this point the power of fan becomes greater than the power of the hand and the cart changes direction. Net force equals Fhand. All three graphs show this movement with a negative sloping and then a positive sloping in Acceleration halfway through Region B which in turn makes velocity slope upwards. For 3. 2 seconds the cart moves away from the sensor until it reaches 1. 6 meters. Net force is equal to Ffan. Velocity and Position graphs show this movement with a positive slope.
Acceleration graph becomes moderately straight until the cart is about to be stopped towards the end of Region C. For 0. 6 seconds the cart begins the transition to a complete stop at 2. 0 meters. The position graph begins to flatten at the end of Region D. Velocity and Acceleration graphs become negative due to the slowing of the cart. The cart is stopped at 2. 0 meters. Net force equals zero. All three graphs show the cart is stopped with a flat line across 2. 0 meters. Newton’s Laws Region A Region B Region C Region D Region E Newton’s 1st Law: The cart is at rest and will remain at rest until a force is applied.
Newton’s 2nd Law: The two forces acting upon the cart (hand and fan) are equal so there is no acceleration. At 2. 5 seconds the acceleration is changed because of the force of hand. Newton’s 3rd Law: The force of hand is applied at 2. 5 seconds so the cart moves towards the sensor as a reaction to the force. Newton’s 1st Law: The force of hand is applied which puts the cart in motion towards the sensor. Newton’s 2nd Law: The force of hand is applied to the cart which changes the Acceleration and moves the cart towards the sensor. Newton’s 3rd Law: Force of hand was applied at 2. seconds in Region A, the force of hand built momentum until the cart moves at the start of Region B. This motion continued until the force of fan overcame the force of hand, forcing the cart way from the sensor. Newton’s 1st Law: Force of fan is applied to the cart which overcomes the force of hand putting the cart in motion away from the sensor. Newton’s 2nd Law: Force of fan is applied changing the direction of the cart away from the sensor. Newton’s 3rd Law: Force of fan overcomes the force of hand pushing the cart away from the sensor.
Newton’s 1st Law: Force of hand is starting to be applied which slows the cart as it approaches 2. 0 meters. Newton’s 2nd Law: Force of hand is slowing the cart and the momentum declines before coming to a complete stop. Newton’s 3rd Law: Force of hand begins to overcome the force of fan slowing the cart as it keeps moving away from the sensor. Newton’s 1st Law: The cart is at rest and will remain at rest until a force acts upon it. Newton’s 2nd Law: The two forces acting upon the cart are equal so there is no acceleration. Newton’s 3rd Law: The force of hand and force of fan become equal so the cart remains at rest.
