8th Grade Science. Quarterly Assessment

Transcription

1 SCIENCE 8 QUARTERLY ASSESSMENT 3 REVISED: 12/12/12 8th Grade Science Quarterly Assessment Student Name Tolley Zorne Zanesville City Schools Revised: 12/12/12

2 SCIENCE 8 QUARTERLY ASSESSMENT 3 REVISED: 12/12/12 1. [S3] [ K2] The gravitational potential energy of an object depends on which of the following? A. Both the mass of the object and the object s distance from the center of the earth B. The mass of the object but not the object s distance from the center of the earth C. The object s distance from the center of the earth but not the mass of the object D. Neither the mass of the object nor the object s distance from the center of the earth 3. [S3] [K1] A student threw two identical balls up into the air. For the balls to have the same amount of gravitational potential energy at a certain point in time, what must be true? A. They must be moving at the same speed. B. They must be at the same height above the ground. C. They must have been thrown at the same time. D. They must have been thrown with the same amount of force. 4. [S3] [K2] [R1] 2. [S3] [K1] A coconut is falling from a palm tree. A student places two books on a table. One book weighs less than the other book. When does the coconut have the most gravitational potential energy? A. When the coconut is at Position 1 B. When the coconut is at Position 2 C. When the coconut is at Position 3 D. The coconut has the same amount of gravitational potential energy at all the positions. Which book has less gravitational potential energy? (Consider the reference point to be the floor.) A. The book that weighs less has less gravitational potential energy. B. The book that weighs more has less gravitational potential energy. C. Both books have the same amount of gravitational potential energy. D. Neither book has any gravitational potential energy.

3 5. [S2] R3] Which of the following requires a fixed reference point to measure. A. the size of an object 7. [S2] [R3] Which of the objects on the chart below would require the most force to achieve the same increase in speed on a frictionless surface? B. the mass of an object C. the motion of an object D. the color of an object Egg Basketball Metal Plate Glass Vase 10g 100g 200g 400g A. egg 6. [S2] [K1] Force is measured in newtons (N). Two forces are applied to a ball at rest. One force is twice that of the other. Which diagram best illustrates the direction the ball will move? B. basketball C. metal plate D. glass vase Zanesville City Schools 3

4 Motion Diagram (use to answer 8 and 9) The graph below shows the position of a car in motion along an east west road over a period of 10 minutes. The car s position is recorded at 1 minute intervals. At time = 0, the car s position is at the starting point. 8. [ S2] [K1] What is the car s motion relative to the starting point at time = 8 minutes? A. at rest at the starting point B. in motion at the starting point C. moving toward the starting point D. moving away the starting point 9. [S2] [K3] What is the total distance traveled by the car after 10 minutes? A. 600 meters B. 1,200 meters E. 2,000 meters D. 3,600 meters Zanesville City Schools 4

5 10. [S2] [R3] A ball is tossed from one person to another person. The table summarizes the forces acting on the ball at each position. Position Type of Forces Forces Acting on the Ball Description of Forces 1 balanced The upward force on the ball and the downward force of gravity are balanced. 2 unbalanced 3 unbalanced/ balanced 4 unbalanced The forward force on the ball is stronger than the drag force of the air. The upward force on the ball is stronger than the downward force of gravity. The forward force on the ball is stronger than the drag force of the air. The downward force of gravity is stronger than the upward force on the ball. 5 balanced The upward force on the ball and the downward force of gravity are balanced. Which of the following completes the table? A. The forward force on the ball and the drag force of the air are balanced. The upward force on the ball is stronger than the downward force of gravity. B. The drag force of the air is stronger than the forward force on the ball. The upward force on the ball and the downward force of gravity are balanced. C. The forward force on the ball is stronger than the drag force of the air. The upward force on the ball and the downward force of gravity are balanced D. The forward force on the ball and the drag force of the air are balanced. The force of gravity is stronger than the upward force on the ball downward. Zanesville City Schools 5

6 SCIENCE 8 QUARTERLY ASSESSMENT 3 REVISED: 12/12/12 Block and Ramp Students investigated the motion of wooden blocks on ramps. They used two boards, each two meters long, to create ramps. They set the ramps up at different heights, as shown in the diagram below. Next they took two identical blocks (I and II) and placed one at the top of each ramp. They placed the blocks so that the back edge of each block was even with the edge of the ramp (distance = 0 meters). The students held the blocks so that the blocks would not slide until the students released them. The students released the blocks at time = 0 seconds. They measured the total distance traveled by each block at 1 second intervals as the blocks slid down the ramps. The students recorded their results as shown below. 11. [S2] [R3] Which conclusion is supported by the results of this investigation as expressed in the data table? A. As the travel time increases, the speed of the block decreases. B. As the ramp steepness is increased, the travel time of the block increases. C. As the distance traveled increases, the average speed of the block increases. D. As the height of the ramp is increased, the average speed of the block decreases. 12. (4 points) [S2] [R3] In your Answer Document, name two forces that acted on the blocks as they slid down the ramps. Describe or show how each force you listed affected the motion of the block.

7 13. [S1] [K2] The symbol d in Coulomb's law equation represents the distance from. a. A to B b. A to D c. B to C d. B to D e. C to D f. A to G g. B to F h. C to E 14. (4 points) [S1] [K1] [K2] Electrical force also has a magnitude or strength. Like most types of forces, there are a variety of factors that influence the magnitude of the electrical force. Explain the results of the electrical force between different charges A to B and C to D. In your explaination include how distance affects repulsion and attraction. Zanesville City Schools 7

8 15. [S2] [R3] A driver is headed north at 50 km/hr. A box is sitting on the seat next to him. What action by the driver would most likely cause him to observe the box appear to slide to the west? A. applying the brakes B. speeding up to 60 km/hr C. making a turn to the east D. making a turn to the west 16. [S2] [K1] In the diagrams below, g is the force of gravity, r is the force of the ramp acting on the car and f is the force of friction. Which diagram shows the directions of the forces acting on a car as it travels down the ramp? B. C. D. A. AA. B. C. D. Zanesville City Schools 8

9 17. [S1] [K4] In the drawing below, the arrows labeled Force 1 and Force 2 represent two forces acting on an object. The directions of the arrows show the directions of the forces, and the lengths of the arrows represent the strengths of the forces. Which answer choice shows an object being acted upon by forces that do NOT add up to zero? A. Zanesville City Schools 9