Physics – First and Second Six Weeks Review Worksheet #2 AISD DCBA

Name: ______Period: ______

State Standards: PHYS.4 (B) describe and analyze motion in one dimension using equations PHYS.4 (C) analyze and describe accelerated motion in two dimensions;PHYS.4 (D) calculate the effect of forces on objects, including the law of inertia, the relationship between force and acceleration, and the nature of force pairs between objects; PHYS.4 (E) develop and interpret free-body force diagrams;

1(3). An airplane flies due north at 100 m/s through a 30 m/s cross wind blowing from the east to the west. Determine the resultant velocity of the airplane.

6. Using the graph above, calculate the velocity of the object between 5 seconds and 10 seconds.
7. Describe the motion of the object between 1 second and 5 seconds.

For the next several questions (#11 – 15), consider the velocity-time plot below for the motion of an object along a horizontal surface. The motion is divided into several time intervals, each labeled with a letter.

2(11). During which time interval(s), if any, are there no forces acting upon the object? List all that apply.

3(12). During which time interval(s), if any, are the forces acting upon the object balanced? List all that apply.

4(13). During which time interval(s), if any, is there a net force acting upon the object? List all that apply.

5(14). During which time interval(s), if any, is the net force acting upon the object directed toward the right? List all that apply.

6(15). During which time interval(s), if any, is the net force acting upon the object directed toward the left? List all that apply. ______

The motion of an object is shown in the position-time graph below. (use for questions # 7-12(16 – 21)).

7(16). Calculate the average velocity of the object between 10 s and 15 s. a. 2.4 m/s b. 2.0 m/s c. 0.5 m/s d. 0.42 m/s

8(17). During which time intervals is the object at rest? a. between 6-10 s and 15-17 s b. between 6 and 10 s c. between 15 and 17 s d. the object is never at rest

9(18). How far does the object travel between 0 s and 30 s? a. 3.0 m b. 35 m c. 30 m d. 20 m

10(19). What is the object ’s displacement between 0 and 30 s? a. 3 m b. 35 m c. 30 m d. 20 m

11(20). Calculate the object ’ s average speed from 10-15 s. a. 1.9 m/s b. 1.7 m/s c. 1.0 m/s d. 2.0 m/s

12(21). Calculate the object ’s average velocity between 2 s and 4 s. a. 1.0 m/s b. -1.0 m/s c. 6.0 m/s d. -6.0 m/s ______

13(30). A ball is dropped from rest from a height 6.0 meters above the ground. The ball falls freely and reaches the ground 1.1 seconds later. What is the average speed of the ball? a. 5.5m/s b. 6.1m/s c. 6.6m/s d. 11m/s

14(31). A car is at rest at a stop light. The light turns green and the car accelerates uniformly to a velocity of 8 meters/second in 12 seconds. How far does the car travel during these 12 seconds? a. 42 m b. 44 m c. 46 m d. 48 m

15(32). A piece of chalk is dropped by a teacher walking at a speed of 1.5 m/s. From the teacher ’s perspective, the chalk appears to fall ______.

______

For the next several questions (#33 – 37), consider the trajectory diagram shown below for a projectile thrown at an angle to the horizontal. The vector arrows represent the horizontal and vertical components of the projectile's velocity. Several points in the trajectory are labeled with a letter. Use the trajectory diagram to answer the next several questions. (Consider air resistance to be negligible.)

16(33). At which point(s), if any, are there no forces acting upon the object? List all that apply.

17a(34). At which point(s), if any, are the forces acting upon the object balanced? List all that apply.

17b(35) . At which point(s), if any, is there a net force acting upon the object? List all that apply.

18(36). At which point(s), if any, is the net force acting upon the object directed toward the right? List all that apply.

19(37). At which point(s), if any, is the net force acting upon the object directed upward? List all that apply.

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20(39). A hammer drives a nail into a piece of wood. Identify an action-reaction pair, and compare the forces exerted by each object.

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21(40). Suppose the force of friction on a sliding object is 10 N. The force needed to maintain a constant velocity is _____. a. more than 10 N. b. less than 10 N. c. 10 N. d. 0 N.

22(42). According to Newton's First Law, a moving object acted on by a net force of zero —

a. remains at rest b. increases its inertia c. decelerates at a constant speed d. moves at a constant rate

23(43). A 1200 kg car increases its speed from 12 m/s to 18 m/s in 4.0 seconds of travel. What is the net force acting on the car? a. 4800 N b. 7200 N c. 9000 N d. 1800 N

44 . The figure shows a block that is being pulled along the floor. According to the figure, what is the acceleration of the block?

a. 0.5 m/s2 b. 1.5 m/s2 c. 2 m/s2 d. 3 m/s2

24(50) . A bug with a mass of 0.15 kilograms is flying with a speed of 2 m/s and is hits the windshield of a moving truck. The bug accelerates to a stop in 0.05 seconds. How much force does the bug hit the truck with?

a. 6 N b. 270 N c. 0.004 N d. 11 N

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25. Using the free body diagrams above, calculate and label the missing information.