Our Lady of CarmelEducational Center, Inc.

81 R. Tirona St., BF Homes, Paranaque

SCIENCE & TECHNOLOGY IVSECOND QUARTER EXAMINATION

NAME:______________________ Date:____________ Score:__________

I. Complete the concept map using the terms below. Some terms may be used more than once.

force second first equal third meeting

II. Complete the following sentences using the terms listed below.

unbalanced force first third friction speed

1. A ____________________ is a push or pull on an object.

2. When an object remains at rest or moves in a straight line with constant speed until it is acted upon by an unbalanced

force, the ____________________ law of motion is demonstrated.

3. A(n) ____________________ force allows you to pick up your book bag.

4. The ____________________ law of motion says that for every action there is an equal but opposite reaction.

5. ____________________ is a way to measure the rate of motion.

6. If you are trying to ice skate and you fall, the ____________________ was too great between your skates and the ice.

III. MULTIPLE CHOICE. Write the letter of the correct answer. Use CAPITAL LETTERS only.

_____1. Consider the five graphs (note the axes carefully) below. Which of these represents motion at constant speed?

A. IV only B. IV and V only C. I, II, and III only D. I and IV only

_____2. An object is dropped from rest. Which of the following five graphs correctly represents its motion? The positive direction is taken to be downward.

_____3. A ball is in free fall. Its acceleration is:A. downward during both ascent and descentB. downward during ascent and upward during descent

C. upward during ascent and downward during descentD. upward during both ascent and descent

_____4. A ball is in free fall. Upward is taken to be the positive direction. The displacement of the ball during a short time interval is:A. positive during both ascent and descentB. negative during both ascent and descent

C. negative during ascent and positive during descentD. positive during ascent and negative during descent

_____5. A baseball is thrown vertically into the air. The acceleration of the ball at its highest point is:A. zero B. g,down C. g,up D. 2g,down

_____6. A freely falling body has a constant acceleration of 9.8 m/s2. This means that:A. the body falls 9.8 m during each secondB. the body falls 9.8 m during the first second onlyC. the speed of the body increases by 9.8 m/s during each secondD. the acceleration of the body increases by 9.8 m/s2 during each second

_____7. The inertia of two objects must be the same if:A. the acceleration of both objects is the same.B. the same force causes the same acceleration in both objects.

C. the product of their mass and speed are the same.D. both objects are moving at the same speed in the same direction.

_____8. When an object is accelerating due to the force of gravity with no other forces acting on it, it is:A. changing direction. B. motionless. C. in free fall. D. at terminal speed.

_____9. The acceleration due to gravity is:A. 9.8 m/sec2 on Earth.B. signified by the letter g.

C. a downward acceleration.D. All of the above

_____10. When you throw a ball up in the air, it travels up and then stops instantaneously before falling back down. At the point where it stops and changes direction to fall back down its:A. acceleration is zero.B. velocity is zero.

C. force is zero.D. mass is zero.

_____11. A feather, initially at rest, is released in a vacuum 12 m above the surface of the earth. Which of the following statements is correct?A. The maximum velocity of the feather is 9.8 m/sB. The acceleration of the feather decreases until terminal velocity is reachedC. The acceleration of the feather remains constant during the fallD. The acceleration of the feather increases during the fall

_____12. Neglecting the effect of air resistance a stone dropped off a 175-m high building lands on the ground in:A. 3 sB. 4 s

C. 6 sD. 18 s

_____13. A bungee jumper falls off a tower and travels 2 seconds before the bungee cord starts to slow her down. What was her average velocity in free fall?A. 4.9 m/secB. 9.8 m/sec

C. 14.5 m/secD. 19.6 m/sec

_____14. A ball is dropped off the roof of a tall building. If the ball reaches the ground in 3 seconds, how tall is the building?A. 9.8 metersB. 14.7 meters

C. 29.4 metersD. 44.1 meters

_____15. A baseball is hit straight up and is caught by the catcher 2.0 s later. The maximum height of the ball during this interval is:A. 4.9mB. 7.4m

C. 9.8mD. 12.6m

_____16. One object is thrown vertically upward with an initial velocity of 100 m/s and another object with an initial velocity of 10 m/s. The maximum height reached by the first object will be that of the other.A. 10 timesB. 100 times

C. 1000 timesD. 10,000 times

_____17. An object is thrown vertically upward with a certain initial velocity in a world where the acceleration due to gravity is 19.6 m/s2 . The height to which it rises is that to which the object would rise if thrown upward with the same initial velocity on the Earth. Neglect friction.A. halfB. √ 2 times

C. twiceD. four times

_____18. The velocity of a projectile equals its initial velocity added to:A. a constant horizontal velocityB. a constant vertical velocity

C. a constantly increasing horizontal velocityD. a constantly increasing downward velocity

_____19. Two bodies are falling with negligible air resistance, side by side, above a horizontal plane. If one of the bodies is given an additional horizontal acceleration during its descent, it:A. strikes the plane at the same time as the other bodyB. strikes the plane earlier than the other body

C. has the vertical component of its velocity alteredD. has the vertical component of its acceleration altered

_____20. A bomber flying in level flight with constant velocity releases a bomb before it is over the target. Neglecting air resistance, which one of the following is NOT true?A. The bomber is over the target when the bomb strikesB. The acceleration of the bomb is constantC. The horizontal velocity of the plane equals the vertical velocity of the bomb when it hits the targetD. The bomb travels in a curved pathE. The time off light of the bomb is independent of the horizontal speed of the plane

FIGURE 21 FIGURE 22 FIGURE 23

_____21. Which of the curves on the graph in FIGURE 21 best represents the vertical component vy of the velocity versus the time t for a projectile fired at an angle of 45o above the horizontal?A. OC B. DE C. AB D. AE

_____22. The airplane shown in FIGURE 22 is in level flight at an altitude of 0.50 km and a speed of 150 km/h. At what distance d should it release a heavy bomb to hit the target X? Take g=10m/s2.A. 150 m B. 295 m C. 420 m D. 2550 m

_____23. A dart, shown in FIGURE 23, is thrown horizontally toward X at 20 m/s as shown. It hits Y 0.1 s later. The distance XY is:A. 2 m B. 1 m C. 0.5m D. 0.05 m

_____24. A projectile is fired from a level ground with an initial velocity that has a vertical component of 20 m/s and a horizontal component of 30 m/s. Using g=10m/s2 , the distance from launching to landing points is:A. 40 m B. 60 m C. 80 m D. 120 m

_____25. Mass differs from weight in that:A. all objects have weight but some lack massB. weight is a force and mass is not

C. the mass of an object is always more than its weightD. mass can be expressed only in the metric system

IV. If the initial velocity,v0,equals 50.00 m/s, find the maximum height and range for each of the launch angles listed in the table below.

.

Answer key Test I

1. D2. B3. A4. D5. B

6. C7. B8. C9. D10. B

11. C12. C13. B14. D15. A

16. B17. A18. D19. A20. C

21. D22. C23. D24. D25. B

The racquet does not swing backwards because the force of your arm keeps it from going back. The action force is the ball hitting the racquet (which your arm “absorbs”), the reaction force is the racquet pushing back on the ball causing it to go back across the net.