What I Have Learned Directions: Complete the paragraph by filling in the blanks using the correct word/s from the box. Write your answers in your Science activity notebook. acceleration displacement position average distance scalar constant deceleration speedometer direction motion velocity Motion is a change in (1.) with respect to a reference point. Distance and displacement, speed and velocity, and acceleration are ways to describe motion. Distance is a (2.) quantity having magnitude but no direction while (3.) is a vector quantity having both magnitude and direction. (4.) speed refers to the total distance travelled divided by the total time and (5.) is displacement divided by total time of travel. А (6.) measures instantaneous speed/velocity. (7.). motion refers to an object moving with constant speed or constant velocity. (8.) is defined as the change in velocity in a time interval. Acceleration may change in any of the following conditions: when the velocity changes, when the (9.) of motion changes, or when both velocity is the opposite of and direction of motion changes. (10.) acceleration where the velocity of an object decreases. 18​