Chapter 07 Test A. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.

Chapter 07 Test A

Multiple Choice

Identify the choice that best completes the statement or answers the question.

____ 1. An example of a vector quantity is:

a. temperature.

b. length.

c. velocity.

d. mass.

____ 2. A quantity whose measurement includes both size and direction is a:

a. scalar.

b. distance.

c. magnitude.

d. vector.

____ 3. Vector quantities are represented by arrows. If two vector arrows are combined, the vector that represents their sum is called the:

a. resultant.

b. equilibrant.

c. component.

d. negligent.

____ 4.

A single force can be represented by two forces (F

and F

) at right angles to each other. The two forces (F

and F

) are called ____ forces.

a. equilibrant b. negligent c. resolution d. component

____ 5. An example of a scalar quantity is:

a. velocity.

b. force.

c. speed.

d. acceleration.

____ 6.

Four forces act concurrently on a point as shown above. The resultant of the four forces is:

a. 0.0 newtons.

b. 5.0 newtons.

c. 14. newtons.

d. 20. newtons.

____ 7.

Using the diagram above, which vector best represents the resultant of forces F

and F

acting at point P?

a. 1 b. 2 c. 3 d. 4

____ 8. An athlete runs 40 meters north and 30 meters south. The resultant displacement of the runner is:

a. 70 meters north.

b. 10 meters north.

c. 70 meters south.

d. 10 meters south.

____ 9. Which pair of concurrent forces may produce a resultant force of 20 newtons?

a. 5 newtons and 10 newtons b. 20 newtons and 20 newtons c. 20 newtons and 50 newtons d. 30 newtons and 5 newtons

____ 10. A boat sailing at 9 kilometers per hour crosses a lake at an angle of 30° to the shore of the lake.If the lake is 18 kilometers wide, the time required for the sailboat to cross the lake is:

a. 0.5 hours.

b. 1 hours.

c. 2 hours.

____ 11. A flock of Canada geese are flying at 41 miles per hour headed due south. If a 52 mile per hour east wind were to begin blowing, the resultant velocity of the flock would become approximately:

a. 11 mph.

b. 47 mph.

c. 66 mph.

d. 93 mph.

____ 12. The normal force is:

a. the force acting to always oppose motion.

b. the force acting perpendicular to the surface.

c. the force from gravity.

d. the force acting parallel to the surface.

____ 13. Which force always opposes the motion of an object?

a. Gravity b. Normal c. Parallel d. Friction

____ 14. An object is moving at constant speed on a slanted surface while a force is applied on the object parallel to the surface of the inclined plane. Which forces are in equilibrium?

a. Gravitational and normal forces b. Frictional and the normal forces c. Normal and parallel forces d. Frictional and parallel forces

____ 15. A 5-newton force directed north and a 5-newton force directed west both act on the same point. The resultant of these two forces is approximately:

a. 5 newtons northwest.

b. 5 newtons southwest.

c. 7 newtons northwest.

d. 7 newtons southwest.

____ 16.

The diagram above shows an object on an inclined plane. The object does not move on the inclined plane because F

balances F

and:

a. F

balances F

b. F

balances F

c. F

balances F

d. F

balances F

____ 17. A 1.0-kilogram block is placed on each of the four frictionless ramps inclined at different angles as shown in the diagram below. Which block will experience the greatest acceleration?

a. 1 b. 2 c. 3 d. 4

____ 18. A 75-kilogram block rests on an incline which makes an angle of 35° with the horizontal. The force exerted on the block by the incline is about:

a. 420 newtons.

b. 515 newtons.

c. 600 newtons.

d. 735 newtons.

____ 19. Gerry rides down a 25° hill on a snowboard. With a combined mass of 80 kilograms, Gerry and the snowboard accelerate at a rate of 2.0 m/s

. The force of friction acting on Gerry and the snowboard is approximately:

a. 160 newtons.

b. 170 newtons.

c. 330 newtons.

d. 785 newtons.

____ 20. Projectiles travel the greatest distance horizontally when the launch angle is:

a. 10°

b. 25°

c. 45°

d. 60°

____ 21. A projectile launched at which angle will have the greatest range?

a. 60°

b. 45°

c. 30°

d. 15°

____ 22. A water balloon is launched horizontally at a height of 1.5 meters above the ground. Its launch speed is 30 m/s. The instant before the balloon hits the ground, its horizontal speed is:

a. 0 m/s.

b. 1.5 m/s.

c. 20 m/s.

d. 30 m/s.

____ 23.

A skateboarder gets a rolling start along a level sidewalk and jumps down meters to a lower level and rolls on.

The time the skater is in the air between rolling off the upper level and touching down on the lower level is:

a. increased if the skater gets a faster rolling start.

b. decreased if the drop is a larger distance.

c. unchanged if the skater gets a faster rolling start.

d. decreased if the skater gets a faster rolling start.

____ 24. Two projectiles are launched at different angles. One is launched at 30° and the other at 60°. Which statement is true?

a. The vertical components of velocity for both projectiles are equal.

b. The 30° projectile has a greater vertical component of velocity than the 60° projectile.

c. The 60° projectile has a greater vertical component of velocity than the 30° projectile.

d. The 60° projectile has a greater horizontal component of velocity than the 30° projectile.

____ 25. As the launch angle of a projectile is increased from an angle of 0° to an angle of 90°, the range of a projectile will:

a. increase then decrease.

b. decrease then increase.

c. remain unchanged.

d. increase only.

____ 26. Which of the following launch angles will give a projectile the same range?

a. 15° and 30°

b. 15° and 45°

c. 15° and 75°

d. 20° and 80°

____ 27. When a projectile is launched, the velocity may be described as:

a. increasing in the vertical direction.

b. decreasing in the horizontal direction.

c. constant in the vertical direction.

d. constant in the horizontal direction.

____ 28. Two balls are kicked upwards from the ground at an angle of 45° from the horizontal. One ball has a speed of 5 m/s, and the second ball has a speed of 15 m/s. (Assume no air friction.) Compared to the slower ball, the faster ball will travel:

a. 3 times farther.

b. 9 times farther.

c. 75 times farther.

d. 1/3 as far.

____ 29.

A golfer hits a golf ball at a 35° angle at a speed of 37 m/s. The maximum height to which the ball travels is about:

a. 1.1 meters.

b. 23 meters.

c. 47 meters.

d. 94 meters.

____ 30.

A ball is rolled across the level surface of a desk which is 0.90 meters high at a speed of 3 m/s. A target is placed 0.75 meters from the desk. At approximately what height must the target be placed to ensure contact with the ball?

a. 0.28 meters

b. 0.31 meters

c. 0.59 meters

d. 0.75 meters

Chapter 07 Test A Answer Section

MULTIPLE CHOICE

1. ANS: C PTS: 1 DIF: basic REF: section 7.1

2. ANS: D PTS: 1 DIF: basic REF: section 7.1

3. ANS: A PTS: 1 DIF: basic REF: section 7.1

4. ANS: D PTS: 1 DIF: basic REF: section 7.1

5. ANS: C PTS: 1 DIF: intermediate REF: section 7.1

6. ANS: A PTS: 1 DIF: intermediate REF: section 7.1

7. ANS: C PTS: 1 DIF: intermediate REF: section 7.1

8. ANS: B PTS: 1 DIF: intermediate REF: section 7.1

9. ANS: B PTS: 1 DIF: advanced REF: section 7.1

10. ANS: D PTS: 1 DIF: advanced REF: section 7.1

11. ANS: C PTS: 1 DIF: advanced REF: section 7.1

12. ANS: B PTS: 1 DIF: basic REF: section 7.2

13. ANS: D PTS: 1 DIF: basic REF: section 7.2

14. ANS: D PTS: 1 DIF: basic REF: section 7.2

15. ANS: C PTS: 1 DIF: intermediate REF: section 7.2

16. ANS: C PTS: 1 DIF: intermediate REF: section 7.2

17. ANS: D PTS: 1 DIF: intermediate REF: section 7.2

18. ANS: C PTS: 1 DIF: intermediate REF: section 7.2

19. ANS: B PTS: 1 DIF: advanced REF: section 7.2

20. ANS: C PTS: 1 DIF: basic REF: section 7.3

21. ANS: B PTS: 1 DIF: basic REF: section 7.3

22. ANS: D PTS: 1 DIF: basic REF: section 7.3

23. ANS: C PTS: 1 DIF: intermediate REF: section 7.3

24. ANS: C PTS: 1 DIF: intermediate REF: section 7.3

25. ANS: A PTS: 1 DIF: intermediate REF: section 7.3

26. ANS: C PTS: 1 DIF: intermediate REF: section 7.3

27. ANS: D PTS: 1 DIF: intermediate REF: section 7.3

28. ANS: B PTS: 1 DIF: intermediate REF: section 7.3

29. ANS: B PTS: 1 DIF: intermediate REF: section 7.3

30. ANS: C PTS: 1 DIF: advanced REF: section 7.3