Force, Motion and Energy Review

Transcription

1 NAME Force, Motion and Energy Review 1 In the picture to the right, two teams of students are playing tug-of-war. Each team is pulling in the opposite direction, but both teams are moving in the same direction. Which of the following best describes the forces in this situation? A The forces are balanced and the net force is zero. B The forces are balanced and Team A is exerting a greater force. C The forces are unbalanced and Team A s force is greater. D The forces are unbalanced and Team B s force is greater. 2 The Pioneer 10 spacecraft was launched in March 1972 to explore the solar system. Pioneer 10 has continued on its journey and is now traveling beyond the solar system. Which statement best explains why Pioneer 10 continues to travel farther in space? A For every action force, there is an equal and opposite reaction force. B Objects in space accelerate at a greater rate than objects on Earth. C The force of the solar wind moves objects through space at a constant speed. D Objects in motion will remain in motion unless acted on by unbalanced forces. 3 John took a drive to Minute Maid Park at an average speed of 40 Km/Hr in traffic for a distance of 120Km. How long did it take him to get to the park? A 2 Km B 1 Hr C 3 Hrs D 3.5 Km/Hr 4 As a student jumps over a hurdle, she loses contact with the ground and moves upward. She returns to the ground because unbalanced forces cause a change in the- A Mass of the student B Height of the student s jump C Gravitational pull on the student D Speed and direction of the student

2 5 Which location has the greatest kinetic energy? A S B T C U D X 6 Indiana Jones s plane passes over Houston at a speed of 10,000 m/s. As the plane passes over Katy, it flies at 8,000 m/s. The plane experienced-- A positive acceleration B negative acceleration C constant speed D deceleration 7 If a force of 50N is applied to each of the three objects, which one will have the least acceleration? (Hint: Think F=MxA)agg A Object X, because it has the greatest mass B Object Y, because it has the least volume C Object Z, because it has the least mass D Object Z, because it has the greatest volume 8 If the student on the right applies 80N of force, what is the net force? A 40N to the right B 40N to the left C 80N to the left D 120N to the right 9 When the air is released from a balloon, the air moves out one end and the balloon moves in the other direction. Which statement does this situation best illustrate? A What goes up must come down. B For every action there is an equal and opposite reaction. C The shape and size of an object affect air resistance. D The acceleration due to Earth s gravity is 9.8 m/s 2.

3 Speed 10 What is the net force in the diagram below? Round to the nearest whole number. Record and bubble in your answer on the grid below. 11 A student walks home from school, making two stops on the way home. What is the total distance the student traveled? Use the grid to record your answer to the nearest tenth of a kilometer. Use the figure to the right to answer the following question. 12 Which of the following is true of the graph above? A The graph represents fast speed B The graph represents no movement C The graph represents negative acceleration D The graph represents positive acceleration 13 A school bus is traveling 15m/sec east, and then increases its speed to 20 m/sec south. The school bus-- A Changed its speed. B Changed its direction. C Accelerated. D All of the above 14 The diagram to the right is representing which of the following? A Inertia B Speed C Acceleration D Velocity 15 mph North

4 15 Which graph best represents a car traveling down the freeway at a constant speed? A B C D Use the figure below to answer the question. Once you have calculated the answer, bubble your answer choice onto the griddable provided. 16 The graph shows the movement of a car over time. What is the car s speed at point B? C B A

5 Use the figure below to answer the following question. Once you have calculated the answer, bubble your answer choice onto the griddable provided. 17 A foam dart is thrown toward a dartboard. The graph to the right represents its motion. Estimate the speed of the traveling dart when it hits the dartboard, 7 meters from the starting point. A 6.3 m/s B 7.0 m/s C 5.5 m/s D 8.0 m/s 18 Two boxes and their masses are shown below. Which of the following situations shows work being done? A A student is sitting in a chair hold both boxes B A student is hold the large box 1 above the floor C A student is standing and holding the small box D A student is lifting the small box 0.5 m from the floor to the table

6 19 The three vehicles shown below are all traveling at a speed of 15m/s, but only the pickup truck has a changing velocity. The pickup truck has a changing velocity because the pickup truck- A can accelerate faster than the other two vehicles B is traveling in the opposite direction from the other two vehicles C is traveling on a curve in the road D needs a large amount of force to move 20 A car travels at a constant speed of 15 m/s for 2 minutes. The car increases its speed from 15 to 25 m/s during the next minute and then travels at a constant speed of 25 m/s for 2 more minutes. Which of the following graphs best represents the car s motion during the 5-minute period?

7 21 In the classroom demonstration shown below, a rubber ball is dropped from Position 1. The ball bounces as shown. At which of these positions shows the ball have both the greatest kinetic energy and the least potential energy. A Position 1 B Position 2 C Position 3 D Position 4 22 Four students raced toy cars on a track. The mass and the acceleration of each car is rounded in the table below. Which toy car had the greatest applied force? A 1 B 2 C 3 D 4 23 For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records data in the table below. Which of these best explains the student s data? A The speed of the care decreases as the cart rolls down the ramp because of friction between the cart and the ramp. B The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is greater than the force of gravity C The speed of the cart increases as the cart rolls down the ramp because the forces acting on the cart are unbalanced D The speed of the cart decreases as the cart rolls down the ramp because the roces acting on the cart are balanced.

8 24 Some students measure the acceleration of a wheeled cart being acted on by varying forces. The students record their data in the table shown below. According to the data table, how much force is acting on the cart when the students measure an acceleration of 2.6 m/s 2. A 13 N B 7 N C 8 N D 12 N 25 The diagram below shows a boat moving north in a river at 3 m/s while the current in the river moves south at 1 m/s. How will the boat be affected if it enters a part of the river where the current is moving south at 2 m/s? A The boat will move slower. B The boat will move faster. C The boat will stop. D The boat will move to the west.