Category 2 Test

1. The graph shows the movement of a car over time. What is the car’s 1 The graph shows the movement of a car over time. What is the car’s average speed? A 10 kilometers per hour B 15 kilometers per hour C 30 kilometers per hour D 60 kilometers per hour

2. Which of the following devices converts chemical energy to light 2 Which of the following devices converts chemical energy to light energy? A C Wind turbines Flashlight B D Electric Lamp Solar cells

3 Diesel fuel is used in the engines of the machines and trucks at the quarry. Which of these is the main energy transformation as the fuel is used by the engines? A Electrical energy is converted to heat energy. B Heat energy is converted to potential energy. C Electrical energy is converted to kinetic energy. D Chemical energy is converted to kinetic energy.

4 Which energy transformation occurs when a match is lit? A Chemical energy to heat energy B Heat energy to potential energy C Electrical energy to heat energy D Kinetic energy to potential energy

5 In the diagram above, a wind turbine is transforming energy from the wind. Between which two steps in the diagram is mechanical energy being converted into electrical energy? A 1 and 2 B 2 and 3 C 3 and 4 D 4 and 5

6. When the human heart contracts, it pumps blood to other parts of 6 When the human heart contracts, it pumps blood to other parts of the body. When the heart contracts, the blood moves because the — A pressure in the heart increases B temperature of the blood increases C density of the blood increases D size of the heart increases

7. The diagram above shows a barrel moving toward a waterfall. The 7 The diagram above shows a barrel moving toward a waterfall. The barrel will have the greatest potential energy at which of these locations? A W B X C Y D Z

8 Which of the following best represents stored potential energy? A Air leaking from a flat tire B Stress built up in a rock fault C Heat given off by a forest fire D Water flowing through a hose

9. At which point on the roller coaster will the car have the greatest 9 At which point on the roller coaster will the car have the greatest amount of kinetic energy? A W B X C Y D Z

10 If a force is applied for 15 seconds, in which situation will the box be moved the greatest distance?

Javelina 11 Javelinas need strong leg muscles to help provide enough force for them to accelerate to high speeds. This fast movement can help javelinas escape from predators and reach the safety of the pack. If a javelina runs 42 m in 6 s, what is its average speed? A 6 m/s B 7 m/s C 48 m/s D 252 m/s

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14. Examine the image provided. Which statement describes a condition that would cause the car to move forward? A The force of the engine is less than the force of friction. B The pulling force is greater than the force pushing on the car. C The pushing force is less than the force pulling on the car. D The force of the engine is greater than the force of friction.

15. Which of the following objects would have the greatest acceleration if they each have 15 N of force acting upon it? A 5g ball B 10g rock C 50g orange D 100g book

16. The three vehicles shown below are all traveling at a speed of 15m/s, but only the pick up 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

17. 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 and holding both boxes. B A student is holding the large box 1 m 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 a table.

Which of these best explains the student’s data? 18. 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 cart 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 forces acting on the cart are balanced.

19. Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop? A The car with the smaller mass will require less force to stop than the car with the larger mass. B The car with the larger mass will maintain its velocity while traveling down the hill. C The car with the smaller mass will take longer to stop than the car with the larger mass. D The car with the larger mass will have less inertia than the car with the smaller mass.

20. In the classroom demonstration shown below, a rubber ball is dropped from Position 1. The ball bounces as shown. At which of these positions does the ball have both the greatest kinetic energy and the least potential energy? A Position1 B Position2 C Position3 D Position4

21. Four students raced toy cars on a track. The mass and the acceleration of each car is recorded in the table below. Which toy car had the greatest applied force? A 1 B 2 C 3 D 4

22. A car travels at a constant speed of 15m/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 25m/s for 2 more minutes. Which of the following graphs best represents the car’s motion during this 5-minute period? A C B D

23. A student walks 2 km in 30 minutes. What is the student’s average speed in km/h? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

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 above. According to the data table, how much force is acting on the cart when the students measure an acceleration of 2.6m/s2? A 13N B 7N C 8N D 12N

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26. Sometimes tectonic plates do not move easily past one another, and the plates become stuck. Forces build up, and when the plates finally move, tension is released, as shown below. The sudden movement of the plates is caused by — A the mass of the plates B the weight of the plates C unbalanced forces D gravitational force

27. 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 2m/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.

28. The graph shows the speed of a car traveling east over a 12-second period on a flat surface. In the first 6 seconds shown on the graph, the car is — A increasing its speed B changing direction C heading northeast D gaining potential energy

29. Four professional bowling balls weigh 4,5, 6 and 7 kg 29. Four professional bowling balls weigh 4,5, 6 and 7 kg. Which bowling ball would produce the greatest force on the pins if all of the bowling balls were accelerating at 3 m/s2 down the bowling lanes? A. The 4 Kg ball would produce the greatest force when traveling at 3 m/s2. B. The 5 Kg ball would produce the greatest force when traveling at 3 m/s2. C. The 6 Kg ball would produce the greatest force when traveling at 3 m/s2. D. The 7 kg ball would produce the greatest force when traveling 3 m/s2.

30. How much force (in Newtons) is required to accelerate a 3 30. How much force (in Newtons) is required to accelerate a 3.0 kg remote controlled toy car at a rate of 6.00 m/s2? Record and bubble in your answer below.