b. How far has each object travelled at time t = 3 s? c. What is the slope of each line? A 20 g mass and a 50 g mass are dropped from rest from the same height above the oon a. If we ignore air resistance, which mass will hit the floor first? b. What is the weight of the 20 g mass? The following diagram shows three masses connected by wires and hung vertically. Draw a FBD for each mass, and determine the tensions in the three wires. 15.0 kg it! ku I 1.3.0 kg 7. A plane travelling at 63 m/s[S] down a runway begins accelerating uniformly at 2.8 m/s? [S]. How far does it travel in 4.0 s? 8. A flying saucer moving initially at 20 m/s[E] accelerates to 50 m/s[W] in 3.8 s. Find the saucer's average acceleration during the time interval.Match the definition from the 15t column to the best term in the 2"d column and place the matching letter in the appropriate space on your answer sheet. 1. Total displacement of an object per unit time A acceleration 2. The area under this graph is used to construct the corresponding position-time acceleration-time graph displacement graph. distance 3. Quantity that has magnitude, but no direction. position-time graph . Total length of path travelled by an object as it moves from one position to scalar quantity another speed 5. The slope of this graph is used to construct the corresponding velocity-time H) vector quantity velocity graph. velocity-time graph 6. Complete the following: An object moves as shown on the d-t graph. An object moves as shown on the v-t graph. 40 40 20 position (m[N]) 20 2.0 4.0 6.0 8.0 10.0 t(s) 0 t(s) Velocity (m/s) [N] Position (m) [N] 20 10 velocity (m/s[N]) 0 t(s) t(s) Sketch the graph of velocity vs time. Sketch the graph of position vs time. Determine the object's: Determine the object's: 1 position at 7.0 s m[N] @ velocity at 7.0 s [Njs/w 2 total distance m 2 total distance m 3 total displacement m[N] 3 total displacement m[N] 4 average speed 4 average speed for entire trip m/s for entire trip m/s 5 average velocity average velocity for entire trip m/s[N] for entire trip m/s[N]1. A golf pro drives a ball through the air. Which of the following correctly lists the force(s) acting on the golf ball for the entirety of its flight? a. force of gravity only b. force of gravity and the force of the \"hit\" c. force of gravity and the force of air resistance d. force of gravity, the force of the \"hit,\" and the force of air resistance 2. Student A and student 8 sit in identical office chairs facing each other. Student A, who is heavier than student B, suddenly pushes with his feet, causing both chairs to move. Which of the following occurs? a. Neither student applies a force on the other. b. A exerts a force on B, but A experiences no force. c. Each student applies a force, but A exerts a larger force. d. The students exert the same amount of force on each other 3. Which of Newton's laws is the above situation an example of? Name the law and what it states. 4. Again, using the situation in Question 2: a. If the flooring surface and office chairs are identical, which student will accelerate quicker? b. Which of Newton's laws did you use to make this decision? c. What is Newton's rst law? Provide an example. 20 fist 5. The three lines on the graph represent the motion of three objects. a. Which object has travelled farthest at time t = 5 s? 1. How can you tell if two objects are in motion with respect to one another? 2. Is there a right or wrong way to choose a frame of reference? 3. Design a concept organizer (like a flow chart) to help organize your thoughts as they relate to inertial and non-inertial frames of reference. 4. Passengers in a high-speed elevator feel as though they are being pressed heavily against the oor when the elevator starts moving up. After the elevator reaches its maximum speed, the feeling disappears. a. When do the elevator and passengers form an inertial frame of reference? A non-inertial frame of reference? b. Before the elevator starts moving, what forces are acting on the passengers? How large is the external (unbalanced) force? How do you know? c. Is a person standing outside the elevator in an inertial or noninertial frame of reference? d. Is the pressure that the passenger's feel a fictitious force? Justify your answer. 5. Suppose you are on a train moving with a constant velocity. Another train on parallel tracks is moving with the same velocity. A passenger in the other train is tossing a ball vertically in the air. a. Describe how the path of the ball would look to you. b. Describe how the path of the ball would look if the trains moved in opposite directions