Download 1. Which will fall faster: a 10 kg bail or a 5.0 kg ball? 2. What two

PART I. CONCEPTS. (just a sample)
1.
Which will fall faster: a 10 kg bail or a 5.0 kg ball?
2.
What two quantities are needed to determine the acceleration of an object?
3. Compare (ball thrown upward): The time it takes for a bail to go up and down. The velocity of the bail going up and the
velocity of the ball when it returns.
4.
What is the difference be~,veen a scalar and vector quantity?
5.
~ich has mo~ ~e~ia: a 5,0 kg block or a 15.0 kg block?
,
6. If you ~ple the net force on an object, its acceleration will ~crease by what factor?~
7. A person is han~ing on a rope. If the rope is pulled ugward, what wili happen to the tension?
~~
g~
8. If the net force on an object ~s zero, what c~ be co.clued about ~ts motton.
9. A person t~ows a ball horizontally; at the same ~st~t ~ identical ball, is &opped from t~e s~e height. ~ich one hits
10. What angle produces the maximum range? The maximum height? The longest time in air?
11. A horizontal force of 10.0 N is required to pull a cart at a constant speed. What is the friction force?
13. What are the units for: distance, velocity, acceleration, force, work, energy, power...
14. ~ object has a weight of 50 N on the E~h ~d a second object has a weight of 50 N on the moon. ~ich has the greater
15. A ear is berg pulled by a force, suddenly the mass of the e~ doubles, what will happen to the cars acceleration?
16. A table cloth can be pulled bom under a gl~s without it movhg. This happens because oD ~ R ~ ~ ~
PART IL PROBLEMS, (just a sample)
1. A c~ is m’avel~g at 12.0 m/s. It skids to a stop in 4.50 m. ~N is the car s acceleration?
[-16 ro2sa]
2. How an& time is ~eeded for a cw to accelerate to 25 m/s if it sta~s born rest and accelerates at 3
[7.1 s]
An arrow is shot upward at a speed of 6.50 m/s.
A. How high will the arrow go? [2.15 m]
B. How long wiil it be in the air? [1.33 s]
X~ ~x/~) ~-~" ~/~
C. What will be its speed when it returns to the same height? [-6.50 m/s] (IL’r"L~L~[-~t:’~{
D. What is the acceleration of the arrow when it is at its highest? [-9.8 m/s2] r, [email protected]~)?~3J<x-t
A 1500. kg plane 1ands and skids to a stop in 805 m on a surface whose !z~ .is 0,85,_0,
~-= ~,’-~C be,5
A. What is the frictional force on the plane? [12500 N]
B, What is the plane s acceleration. [-8.33 m/s ]
~ ,~qc~
C. What was the plane’s initial velocity? [116 m/s]
~
A bail is thrown horizontally from atop a roof that ls 6.00 m high at a speed of 2.25
.~
A. How long wi!l it take to hit the ground? [1.11 s]
B. How far from the base of the buflding willriot~? I].510m~] ~5
C. What will be its velocity when it hits the g . [ . s]
a caanonball is laanched horizontally from a tower with a speed of 100 m/s. ~" (~lJ
A. How far downrange will the cannon ball be after 2.0 seconds? [200 m]
B. If it lands 350 m from the base of the tower, how tall is the tower? [60 m]
; I 7.
~A rope whose tension is 65.0 N is pulling a 35.0 kg wagon.
1~ ~ tvtO’~
A. What will be the acceleration of the wagon if the surface is friotianless? [ 1.85m/s2]
B. What will be the acceleration of the wagon if ~’K : 0.15 ? [0.39 m/s:]
0//C~ ~ ~ ~.
A force of 20 N is needed to pull a 8.0 kg b!ock at co~ Cx’~O ~’~ ~ ~
A. What is the friction force on the object? [-20 N]
B. What is the coefficient of friction? [0.26] ~’|~~" -~:’4" I i’d2 :
;--t~-~= ~ <I
A helicopter is flying horizontally with a speed of 45.0 m/s at an altitade of 65.0 m. The pilot~trying to save a castaway on
an island and drops a care package. How far from the island should the pilot drop in order for the package to land on the
island? v- l.f mls
,/: ya
An 85.0 kg student is standing on a scale (Newton) in an elevator, g~1~at~Zgr}’[~cale read if:
A. The elevator is at rest? [833 N] .~-C>
B. 3t~e elevator accelerates upward at 3.0 rn/s ? [1088 N]
C. The elevator accelerates downward at 7.50 m/s~? [196 N]
I I. If it takes 50 J to push a crate 6,0 m across a floor, what force was applied to the crate?
[8.3
12. How much power is required to lift a 45 N rock 5 meters in 2 seconds?
-t::
[113 W]
PART iII. SAMPLE FREE RESPONSE PROBLEMS
A train starting from rest, accelerates at a rate of 1.5 m/s2 for 30 seconds. After this, the train continues at a constant velocity
for 5 minutes more. The train then decelerates at a rate of 2.3 m/s2 until it is stopped. What distance did the train travel from
start to stop?
2. A ball is launched at 35 m/s at an ~gle of~~.
a. How long will it be in the ak? [2.4 s]
B. How far away wil! it land? [77 m]
C.v0H°w high= 35 ~s will itgo?
.........
..............................................................................
Vo 3 os o: .1 ~
Add the follow~g forces to determine the magnitude
Fe =l.10 N~_:
150 N
[Mag: 202 N]
[Di~:
21ON of S]
4. Complete the foll,,._owthg:
~
~tK = 0.25
D. ~mt will be the acceleration of the blocks?
E. ~at is Ne tension in the s~Ng while the blocks ~e movNg?
B. 2,80 rrgs2
-- T- 1 ¢,7-
5. Physic~)aphs.
X
V, I"13/$
15
i0
o
246
-]o
-15
A. Sketch the equivalent x-t graph.
B. Calculate the acceleration from 0 to 3 seconds. [+3.3 rMs2]
C. What is the total distance traveled? [105 m] Displacement? [75 m]
C,
Sketc-h the v-t graphs for (a) & (b). Sketch the x-t graph’s for (d), (e), & (f)
q
@) 5"D (~ 3
C. 10.5N
T: Io.5-t4