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```					 Review Test 2.1 Conceptual Physics draft.doc Period______ Name:______________________
Directions: Show work, show units. Ask questions!

1)    (TEKS 2E – Proficient) Which of the following pieces of equipment would be selected to
measure the mass of a toy car?

A) Graduated cylinder        B)Thermometer       C)Triple-beam balance       D)Meter stick

2)    (TEKS 2H – Proficient) The mass of a paperclip is approximately

A) 1 x 10-3 mL        B) 1 x 10-3 m       C) 1 x 10-3 kg      D) 1 x 10-3 N

3)    Convert: 1,250 grams = ______________ kg

4)    (TEKS 2H – Proficient) The weight of a small dog is approximately

A) 102 kg             B) 102 m            C) 102 mL           D) 102 N

5)    (TEKS 2F & 2H – Proficient) According to the equipment below, the correct mass of the
baseball is   ______________

6) (TEKS 2J - Developing) On the set of axes below, label the x and y axes, and also indicate
which axis is used for the dependent variable, and which is used for the independent variable.

7)    (TEKS 1A - Proficient) Which of the following safety concerns would best relate to a Forces
Lab?

A)   Closed containers should never be heated.
B)   Never allow eye exposure to either direct or reflected laser light.
C)   Heavy masses should be used only as directed.
D)   You should never cut objects toward you.
8)   (TEKS 3E – Proficient) On the website http://www.infrastructurereportcard.org/ , the
American Society of Civil Engineers claim that \$2.2 trillion dollars of investment is needed to
repair America’s aging infrastructure. List 5 categories in which such work is needed to be
done:
__________________,__________________,_____________
_____,__________________, __________________, . What kind
of engineer performs this kind of work? __________________

9)   (TEKS 4D – Developing) What are the units of “Newtons”? Hint: Use Newton’s 2nd Law, F = m·a.
__________________

10) (TEKS 3F – Developing) Make sketches showing a 6.0-Newton force and an 8.0-Newton force
acting at simultaneously on a point at angles 0°, 45°, 90° and 180°. For each, show the
magnitude of the resultant force.

11) (TEKS 3F – Developing) Two forces act concurrently, at the same time in the same direction,
on an object. Their resultant force has the largest magnitude when the angle between the
forces is what angle? ________

12) (TEKS 3F – Proficient) A motorboat, which has a s peed of 6.0 m/s in still water, is headed
east as it crosses a river flowing south at 4.5 m/s. What is the magnitude of the boat's
resultant velocity with respect to the starting point? Hint: Draw the vectors, and use the
Pythagorean theorem.

12) (TEKS 4D – Developing) For each of the following bodies, state whether it is in equilibrium,
or Not in Equilibrium:
A)   EQ     Not   in   EQ   a projectile at the highest point in its trajectory
B)   EQ     Not   in   EQ   a car moving with a constant s peed along a straight, level road
C)   EQ     Not   in   EQ   a satellite orbiting Earth in a circular orbit
D)   EQ     Not   in   EQ   a ball falling freely toward the surface of Earth
E)   EQ     Not   in   EQ   a skydiver falling through the air at terminal velocity
F) EQ      Not in EQ an apple falling freely toward the surface of Earth
G) EQ      Not in EQ a cart rolling down a frictionless incline
H) EQ      Not in EQ a block siding at constant velocity across a tabletop
θ

14) (TEKS 4D – Developing) Consider the angle, θ, formed by two force vectors acting concurrently
on an object as shown above. The force vectors are of equal magnitude. Equilibrium for this
system can be achieved at a ______________ angle.

A)   00          B)   90 0       C)   180   0
D) 45   0

15) (TEKS 4D – Developing) The diagram below represents two concurrent forces, F1 and F2.

Draw the vector, FNET, that represents the vector sum of these two forces.
Draw the force vector that will produce equilibrium with FNET.

16) (TEKS 4E – Proficient) For each of the following diagrams, draw the net force vector. Which
diagram represents a box in equilibrium? ______

A)                                                C)

B)                                                D)
17) (TEKS 4D – Developing) Which of the following graphs best represents the motion of an
object in equilibrium?

A)                                                  C)

B)                                                  D)

18) (TEKS 4E – Proficient) In the diagram below, a 10.-Newton force due north and a 10.-
Newton force due east act concurrently on an object, as shown in the diagram below.

10 N

10 N

What additional force is necessary to bring the object into a state of equilibrium?

19) (TEKS 4D – Proficient) A force of 20 Newtons east and a force of 20 Newtons west act
concurrently on a 5.0-kilogram cart. What is the acceleration of the cart? Hint: Draw the
vectors, and the net force. Use “N2L”, a = F/m.
20) (TEKS 4D & 4E – Proficient) The diagram below shows a 4.0-kilogram object accelerating
at 10.0 m/s2 on a rough horizontal surface.

What is the magnitude of the frictional force Ff acting on the object?

21) (TEKS 4D & 4E – Proficient) Two forces, F1 and F2 , are applied to a block on a frictionless,
horizontal surface as shown below.

If the magnitude of the block's acceleration is 2.0 m/s2, what is the mass of the block? Hint:
Determine the net force on the block, then remember that if F = ma, then m = F/a.

22) (TEKS 4D – Proficient) A 25-Newton horizontal force northward and a 55-Newton horizontal
force southward act concurrently on a 15-kilogram object on a frictionless surface. What is
the magnitude of the object's acceleration? Hint: Determine the net force on the object,
then remember that a = F/m.

24) (TEKS 4D – Developing) A carpenter hits a nail with a hammer. Compared to the magnitude
of the force the hammer exerts on the nail, the magnitude of the force the nail exerts on
the hammer during contact is
A)   less                        B)   greater                    C)   the same
25) ____________(TEKS 4D – Developing) If a 65-kilogram astronaut exerts a force, FR, with a
magnitude of 50. Newtons on a satellite that s he is repairing, what is the magnitude of the
force FA that the satellite exerts on her?

FA                        FS

____________
26) _ _ _ _ _ _ _ _ _ _ _ _ (TEKS 4D – Developing) A student pulls a 60.-Newton s led by
applying a force of 20. - Newtons. What is the magnitude of the force that the s led exerts
on the student?

27) (TEKS 4D – Extension) A 0.149-kilogram baseball, initially moving at 15 m/s, is brought to
res t in 0.040 second by a baseball glove on a catcher's hand. The magnitude of the
average force exerted on the ball by the glove is   _____________ Hint: Use “Fat
mav”. That is, F· Δt = m·Δv.

28) ____________(TEKS 4D – Proficient) A 70-kilogram hockey player skating east on an ice
rink is hit by a 0.1-kilogram hockey puck moving toward the west. The puck exerts a
50-Newton force toward the west on the player. Determine the magnitude of the force
that the player exerts on the puck during this collision.

29) (TEKS 4D – Proficient) A motorcycle being driven on a dirt path hits a rock. Its 60.-
kilogram cyclist is projected over the handlebars at 20. m/s into a hays tack. If the
cyclist is brought to res t in 0.50 second, the magnitude of the average force exerted on
the cyclist by the hays tack is_______________ Hint: Use “Fat mav”. That is,
F· Δt = m·Δv.

30)   __________ (TEKS 4D – Proficient) A 2.00-kilogram object weighs          19.6 Newtons on
Earth. If the acceleration due to gravity on Mars is 3.71 m/s2 , what is the object's mass
on Mars? Hint: Weight (in N) = mass (in kg) * a, thus a = ?

31) __________ (TEKS 4D – Proficient) What is the acceleration due to gravity on a
planet where a 15.0-kilogram mass weighs 60.0 Newtons?
32)   __________ (TEKS 4D – Proficient) A 60.-kilogram physics student would weigh
156.0 Newtons on the surface of planet X. What is the magnitude of the acceleration due
to gravity on the surface of planet X?

33) __________ (TEKS 4D – Proficient) What is the weight of a 4.00-kilogram object on
the surface of Earth? Hint: Weight (in N) = mass (in kg) * a, thus a = ?

34) (TEKS 4D – Proficient) A 0.15-kilogram baseball moving at 25. m/s is stopped by a catcher
in 0.010 second. What is the average force s topping the ball? Hint: Use “Fat mav”. That is, F·
Δt = m·Δv. SHOW YOUR WORK

35) Objects tend to resist changes in motion. This property is called:
a. weight     b. momentum         c. potential energy        d. inertia.

36) _____________In the picture below, a girl is sitting motionless on a swing. What is the net
force on the girl?

37) __________A book rests on a table. The force of gravity pulls down on
the book with a force of 20 newtons. What prevents the book from
accelerating downward at 9.8 m/s2?
A)    The table presses back up on the book with an equal and opposite
force of 20 newtons.
B)   The table presses back up on the book with a force greater than 20
newtons.
C)    The table and the book together are accelerating downwards at 9.8
2
m/s .
D)   The inertia of the book holds it up.

38)    A rocket can fly into space because:
a.     when it is launched, the hot exhaust gases hit the ground and push the rocket forward.
b.    the rocket pushes the exhaust gases backward, and there is an equal and opposite
reaction pushing the rocket forward.
c.    when the gases are burning up, the mass of the rocket decreases, changing the amount of
gravity on the rocket.
d.    the launch pad pushes the rocket forward like a slingshot.
39). Two carts are rolling down two different ramps. Cart 1 is of mass 1.0 Kg. Cart 2 is of
mass 10.0 Kg. Both ramps are inclined at the same angle. Both carts are free of friction
and air resistance. Which cart accelerates more rapidly?

a. Cart 1 will have greater acceleration.
b. Cart 2 will have greater acceleration.
c. The carts will accelerate equally.
d. You cannot say which cart has greater acceleration because the acceleration depends on
the intial velocity of the carts.

40) A car is traveling down a straight stretch of highway at 90 kilometers per hour. The driver
suddenly slams on the brakes and brings the car to a quick stop. As a result, the unbelted
passengers will at first:
a.   continue to move forward in a straight line.
b.   come to a stop at the same time as the car.
c.   be pushed against the door on the passenger side.
d.   be pushed against the back of the seat.

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