VelocityAcceleration Speeding Up or Slowing Down #1 #2 #3 #4 When the acceleration is in the same direction as the motion (velocity) the object is speeding up. (++ or --) When the acceleration is in the opposite direction of the motion (velocity) the object is slowing down. (+- or -+) Speeding Up and Slowing Down Activity As you hopefully noticed in the previous examples, whether the cart is speeding up or slowing down can not be determined from only the sign of the acceleration. There is, thankfully, a pattern that can be used to determine whether the cart is speeding up or slowing down. (+) or (-) (speeding up) or (slowing down) speeding up - - slowing down speeding up +slowing down

5. Up away from the motion detector and then down the ramp a. Observe the motion of the cart after an initial push without using the motion detector. Answer the following questions for the cart while coasting. c. Record the graphs as displayed by the motion detector and circle the correct answers to the questions. t position 0 + t velocity 0 + t 0 + acceleration

5. Up away from the motion detector and then down the ramp a. Observe the motion of the cart after an initial push without using the motion detector. Answer the following questions for the cart while coasting. c. Record the graphs as displayed by the motion detector. + t position 0 + t velocity 0 + t 0 + acceleration

5. Up away from the motion detector and then down the ramp a. Observe the motion of the cart after an initial push without using the motion detector. Answer the following questions for the cart while coasting. c. Circle the correct answers to the questions. d. Draw a motion map including both velocity and acceleration vectors. e. Is the velocity positive or negative? f. Is the acceleration positive or negative? Does the direction of the velocity change? Does the direction of the acceleration change? + then - - yes no t position 0 + t velocity 0 + t 0 + acceleration Up the hill i.Is the slope (constant), (increasing) or (decreasing)? ii.Is the slope (positive) or (negative)? iii.This slope represents the cart’s ? Velocity vs. Time i.Is the slope (constant), (increasing) or (decreasing)? ii.Is the slope (positive) or (negative)? iii.This slope represents the cart’s ? Down the hill i.Is the slope (constant), (increasing) or (decreasing)? ii.Is the slope (positive) or (negative)? iii.This slope represents the cart’s ? velocity acceleration