Free Printable PLTW POE Unit 2 Review

1.

A vector has both ____ and _____

a)

speed and length

b)

magnitude and direction

c)

degrees and radians

d)

style and grace

2.

The _______ of two or more vectors is the sum of the vectors.

a)

components

b)

scalar

c)

resultant

d)

magnitude

3.

When a member is being pushed together or crushed, this is known as a ______ force

a)

tension

b)

shear

c)

torsion

d)

compression

4.

____________ occurs when a force is pulling a member apart.

a)

compression

b)

torsion

c)

shear

d)

tension

5.

If a truss has the proper combination of joints and members, it is said to be

a)

statically determinate

b)

unstable

c)

statically indeterminate

6.

Consider the following forces, what additional force is needed to keep the block in static equilibrium?

a)

9N force pointing up

b)

9N force pointing down

c)

16N force pointing down

d)

16N force pointing up

7.

If a structure is statically determinate it

a)

is mathematically solvable

b)

cannot be disfigured

c)

can handle large forces

d)

will break easily

8.

Supplies one reaction force, perpendicular to a surface in a truss

a)

Node

b)

Member

c)

Roller

d)

9.

The 500 lb force causes a ____ moment about point A.

a)

positive

b)

negative

c)

maximum

d)

neutral

10.

If this truss is stable, the sum of the forces in the vertical direction

a)

equals 500 lb.

b)

equals 250 lb.

c)

equals 0.

d)

is unknown at this time.

11.

The deflection of the beam is ___ the Modulus of Elasticity.

a)

directly proportional to

b)

inversely proportional to

c)

equal to

d)

not dependent on

12.

A 100-lb vertical force is applied to the end of a lever which is attached to a shaft at O. Determine the moment about point O.

a)

1200 lb⋅in CW

b)

2400 lb⋅in CW

c)

2078 lb⋅in CW

d)

100 lb⋅in CW

13.

Determine the Moment about point A.

a)

361.8 lb⋅in CW

b)

260 lb⋅in CW

c)

277.6 lb⋅in CW

d)

322.4 lb⋅in CW

14.

TRUE OR FALSE:

A moment is equal to the force times the parallel distance from the pivot point to where that force is acting.

a)

True

b)

False

15.

Set up the problem.

a)

sin(47) = x/28

b)

cos(47) = x/28

c)

tan(47) = x/28

d)

cos(47) = 28/x

16.

Which Trig function do you use?

a)

Sine

b)

Cosine

c)

Tangent

17.

What is the length of side x?

a)

6.57 cm

b)

7 cm

c)

7.44 cm

d)

26.33 cm

18.

Find the measure of the missing angle.

a)

64^o

b)

26^o

c)

61^o

d)

.008^o

19.

Quantity with both magnitude and direction

a)

scalar

b)

vector

c)

moment

d)

centroid

20.

Support that prevents movement in one direction

a)

pinned support

b)

roller support

c)

gusset

d)

joint

21.

Geometric center of an object

a)

joint

b)

vector

c)

centroid

d)

moment

22.

Name the missing force....

a)

weight force

b)

normal force

c)

frictional force

d)

tension force

23.

Name the missing force...

a)

applied force

b)

weight force

c)

tension force

d)

drag

24.

Match description with free-body diagram.

a)

A book is at rest on a tabletop.

b)

A gymnast holding onto a bar, is suspended motionless in mid-air. The bar is supported by two ropes that attach to the ceiling. Diagram the forces acting on the combination of gymnast and bar.

c)

An egg is free-falling from a nest in a tree. Neglect air resistance.

d)

A flying squirrel is gliding (no wing flaps) from a tree to the ground at constant velocity. Consider air resistance.

25.

Tension is a force that..

a)

pulls

b)

stresses

c)

compresses

26.

Determine the force in member B.

a)

6.71 kN in compression

b)

6.71 kN in tension

c)

6 kN in compression

d)

6 kN in tension

27.

Two kids are sitting on a see-saw. On one side, there is a person 3 m away from the fulcrum with a weight of 600 N. On the other side, is a person weighing 450 N. How far away must the second person sit in order for the see-saw to be at equilibrium?

a)

4 m

b)

2 m

c)

3.5 m

d)

5 m

28.

Three vectors are shown in Figure 1. Their magnitudes are given in arbitrary units. Find the magnitude of the resultant vector.

a)

26.70

b)

27.06

c)

13.50

d)

50

29.

What is the measure of angle BAD?

a)

39.8 degrees

b)

50.2 degrees

c)

29.1 degrees

d)

59.0 degrees

30.

TRUE OR FALSE:

Roller joints have two reaction forces.

a)

True

b)

False

31.

What is the magnitude and direction of the member force CB?

a)

CB = 447 lbs (T)

b)

CB = 447 lbs (C)

c)

CB = 230 lbs (T)

d)

CB = 230 lbs (C)

32.

What is the magnitude and direction of the member force BD?

a)

BD = 0 lbs

b)

BD = 575 lbs (T)

c)

BD = 575 lbs (C)

d)

BD = 230 lbs (C)

33.

The centroid of an object is...

a)

its center of gravity or center of mass

b)

its center point

c)

its balancing point

34.

TRUE or FALSE: in symmetrical objects, the centroid is determined by an object's line of symmetry.

a)

True

b)

False

35.

Given that the centroid of a right triangle is located at a distance of 1/3 its height and 1/3 its base, find the location of centroid of the triangle above if the B = 12 and H = 9.

a)

(12, 9)

b)

(4, 3)

c)

(3, 4)

d)

(9, 12)

36.

A LOW modulus of elasticity means...

a)

a greater resistance to deformation

b)

a lower resistance to deformation

c)

a greater resistance to strain

d)

a lower resistance to strain

37.

Using the equation for the moment of inertia above, find the base of a piece of wood that has moment of inertia 21 and height 5.5.

a)

1.5

b)

2

c)

1

d)

15

38.

A truss that satisfies the equation 2J=M+R is said to be...

a)

statistically determinant

b)

jointly determinant

c)

reactionally determinant

d)

determinant

39.

The formula to calculate the x-bar of this shape.

a)

$\frac{B}{2}$

b)

$\frac{B}{3}$

c)

$\frac{4r}{3\pi}$

d)

$r$

40.

The formula to calculate the x-bar of this shape.

a)

$\frac{B}{2}$

b)

$\frac{B}{3}$

c)

$\frac{4r}{3\pi}$

d)

$r$

41.

The formula to calculate the y-bar of this shape.

a)

$\frac{B}{2}$

b)

$\frac{B}{3}$

c)

$\frac{4r}{3\pi}$

d)

$r$

42.

The formula to calculate the x-bar of this shape.

a)

$\frac{B}{2}$

b)

$\frac{B}{3}$

c)

$\frac{4r}{3\pi}$

d)

$r$

43.

How do you calculate the area of this shape?

a)

$side\ length^2$

b)

$width\ \cdot\ height$

c)

$\pi r^2$

d)

$\frac{1}{2}\left(base\ \cdot\ height\right)$

e)

$\frac{1}{2}\left(\pi r^2\right)$

44.

How do you calculate the area of this shape?

a)

$side\ length^2$

b)

$width\ \cdot\ height$

c)

$\pi r^2$

d)

$\frac{1}{2}\left(base\ \cdot\ height\right)$

e)

$\frac{1}{2}\left(\pi r^2\right)$

45.

Calculate the x-bar for this shape. Round your answer to the tenths place (one number after decimal point, i.e. 0.0).

(a)

46.

Calculate the x-bar for this shape. Round your answer to the a whole number, i.e. 0).

(a)

47.

Calculate the y-bar for this shape. Round your answer to the tenths place (one number after decimal point, i.e. 0.0).

(a)

48.

What type of support is at A?

a)

b)

Roller

c)

Built-In-End

d)

Cable

49.

What type of support is at B?

a)

b)

Roller

c)

Built-In-End

d)

Cable

50.

How many reaction forces are at support A (left)?

(a)

51.

How many reaction forces are at support B (right)?

(a)

52.

Is the moment positive or negative?

a)

Positive

b)

Negative

53.

$M\ =\ F\ \cdot\ D_{\perp}$

Calculate the moment. Note: Distance should be converted to feet.

Provide your answer as a whole number with no units.

(a)

54.

$M\ =\ F\ \cdot D_{\perp}$

Calculate moment C. Round your answer to a whole number and do not include units.

(a)

PLTW POE Unit 2 Review

Total questions: 54

Worksheet time: 3hrs 12mins

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