project Physics 1

Section A: Short Answer Questions (5 points each) 1. Describe the scientific method. 2. To convert 1.8 h to minutes, by what conversion factor should you multiply? 3. Does a car that is slowing down always have a negative acceleration? Explain. 4. If an object has zero velocity at some instant, is its acceleration zero? Give an example. 5. Ramon pushes on a bed that has been pushed against a wall. Draw a free-body diagram for the bed and identify all the forces acting on it. Make a separate list of all the forces that the bed applies to other objects. Figure 4-17 Figure 4-18 6. Complete the following concept map using the following terms and symbols: Normal, FT, Fg force tension gravity FN7. Which of the following actions is permissible when you graphically add one vector to another: moving the vector, rotating the vector, or changing the vector's length? 8. If your textbook is in equilibrium, what can you say about the forces acting on it? 9. What is the sum of three vectors that, when placed tip to tail, form a triangle? If these vectors represent forces on an object, what does this imply about the object? Secton B Calculating Average Speed As an object moves, it often undergoes changes in speed For example, during an average trip to school, there are many changes in speed. Rather than the speedometer maintaining a steady reading, the needle constantly moves up and down to reflect the stopping and starting and the accelerating and decelerating. One instant, the car may be moving at 50 mi/hr and another instant, it might be stopped (i.e., 0 mi/hr). Yet during the trip to school the person might average 32 mi/hr. The average speed during an entire motion can be thought of as the average of all speedometer readings. . Click on the links in the Red Box to view the Project Rubrics for this project. A position displacement Average Speed = Distance Traveled Average Velocity = Time of Travel & time time 1. Frank's car rolled 300 cm in 1.5 s. Noah's car rolled 360 cm in 2 s. What is the average speed for each car? 2. It took Ellie 4 hours to paddle her canoe 10 km upstream. After a leisurely 3 hour picnic, she paddled home in 1 hour. a. What was Ellie's average speed while paddling upstream? b. What was Ellie's average speed while paddling downstream? 3. Newton's first law of motion is often stated as: 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 . Based on Newton's 1 st Law describe (in no less than 100 words) a real world scenario where you would be subject to these forces. 4. What is Inertia. Explain the relation of Inertia with Newton's 1 st Law on a person not wearing a seatbelt when a car moving 70 miles per hour suddenly slams on the brakes