Name: __________________________ Date: ________________ Science 8th : Physical Science Mrs. Padilla Score _____/50 PART A: VOCABULARY WORD _______1) Motion a. is the rate of change of velocity _______2) Displacement b. is the product of its mass and velocity _______3) Speed c. distance an object travels per unit of time _______4) Velocity d. change in an object’s position relative to a reference point _______5) Momentum e. distance and direction of the object’s change in position. _______6) Acceleration f. includes the speed of an object and the direction of its motion _______7) Centripetal acceleration g. acceleration toward the center of a curved or circular path Part B. Mention the equations of: 1) Speed = _______________________ 2) Momentum =_______________________ 3) Acceleration = ________________________ 4) Changing velocity = ______________________ Part C. Fill in the blanks 1) 2) 3) 4) On a distance-time graph, time is the _________________, and distance is the ______________. The slope of a line plotted on a distance-time graph is the __________________. The speed of an object increases if the acceleration is in the same direction as the ___________. The speed of an object decreases if the acceleration and the acceleration and the velocity of the object are in the _________________. 5) If and object is moving in a straight line, the change in velocity equals the _______________ minus the ________________. Part D. Answer the following questions. 1) What is the difference between average speed and constant speed? 2) What the difference between position in science usage and position in common usage? 3) How can you calculate the average speed? Explain 4) How velocity and speed are different? 5) How to objects could have the same velocity but different momentums? Explain 6) Why you can’t use the acceleration equation for an object that changes direction? 7) Describe the difference between the total distance traveled and the displacement.