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Material Science > Midterm > Flashcards

Midterm Flashcards

1
Q

True or False: The best way to mathematically represent a vector is force and direction.

A

False: Magnitude and Direction

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2
Q

True or False: Two vectors in the same direction can be added together.

A

True

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3
Q

True or False: You represent a vector on a graph by an arrow starting at the origin.

A

True

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4
Q

True or False: An arrow is the only way to represent a vector on a graph.

A

False: Rectangular coordinates can also be used

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5
Q

True or False: The vertical coordinate of a force at an angle is equal to amplitude.

A

False: Vertical Velocity, altitude, or velocity against gravity.

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6
Q

True or false: The horizontal coordinate of a force of an angle is equal to the horizontal velocity.

A

True

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7
Q

True or False: Newton’s first law is F=MA

A

False: An object in motion stays in motion and an object at rest stays at rest.

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8
Q

True or False: Newton’s second law is F=MA

A

True

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9
Q

True or False: Newton’s Third law is For every action there is an equal and opposite reaction.

A

True

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10
Q

True or False: Inertia is the tendency to resist change in state.

A

True

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11
Q

True or False: The less mass you have the more inertia you have

A

False: The more mass you have the more inertia.

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12
Q

True or False: The more velocity you have the more inertia you have.

A

True

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13
Q

True or False: If a weight is hanging from the ceiling and you pull slowly, the lower string will break.

A

False: the upper string.

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14
Q

True or False: If a weight is hanging from the ceiling and you pull quickly, the lower string will break.

A

True

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15
Q

True or False: Newton’s third law of motion is demonstrated when you break a car and your head hits the windshield.

A

False: Newton’s first law

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16
Q

True or False: Kinetic friction is when there is enough force between the object and the surface it’s on to not move.

A

False: Static Friction

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17
Q

True or False: Static Friction is when there I enough force to overcome the friction of the ground to move the object.

A

False: Kinetic Force

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18
Q

True or False: All the force of the biceps muscle is used to move the elbow.

A

False: The force also is used to stabilize the joint.

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19
Q

True or False: Potential energy is stored energy.

A

True

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20
Q

True or False: Gasoline does not have potential energy.

A

False: Gasoline has potential energy

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21
Q

True or False: An object in motion has kinetic energy.

22
Q

True or false: The slower the velocity, the greater the kinetic energy

A

False: faster the velocity

23
Q

True or false: The greater the mass the greater the kinetic energy.

24
Q

True or false: Kinetic energy involves mass and velocity.

25
Q

True or False: Momentum is mass X velocity.

26
Q

True or False: Work is a unit of power.

A

False: It’s a unit of energy

27
Q

True or false: Work is force x distance

28
Q

True or false: Torque is used to measure linear motion.

A

False: Rotary motion

29
Q

True or False: Torque is force x distance

30
Q

True or False: The center of gravity for women is 2 inches above the hips.

A

False: It is at the hips

31
Q

True or False: The center of gravity of men is the same as women.

A

False: It’s two inches above the hips

32
Q

True or false: A first order lever has the fulcrum in the middle.

33
Q

True or false: A second order lever has the load in the middle and an example is a see saw

A

False: Load is in the middle, but an example is a wheelbarrow.

34
Q

True or false: A third order lever has the force in the middle and gets little range of motion.

A

False: Third order lever gets a lot of range of motion.

35
Q

True or False: Biceps is an example of a first order lever.

A

False: third lever

36
Q

True or false: limits of stability is related to the center of gravity centered over the silhouette of the foot.

37
Q

True or false: The center of gravity is always within the body.

A

False: It can be outside.

38
Q

True or False: To stabilize a wheelchair the center of gravity should be behind the axil.

A

False: In front of the axil.

39
Q

True or false: Elasticity is when the object bends and stays bent, but doesn’t break.

A

False: Plasticity

40
Q

True or false: Elasticity is when the material bends then returns to its original shape.

41
Q

True or false: The fracture point of a material is within the plastic region.

A

False: After

42
Q

True or false: Bone is very plastic.

A

False: Elastic not plastic

43
Q

True or False: The muscle keeps from tearing because of ligaments.

A

False: tendons

44
Q

True or False: A spiral fraction is because of twisting or rotation.

45
Q

True or False: Hylain cartilage protects the tendon by covering the bone during motion.

46
Q

True or False: Discs are elastic.

47
Q

True or False: discs do not lose their elasticity.

A

False: Get dehydrated and lose elasticity

48
Q

True or false: The center of rotation on an orthotic device should be right over the center of rotation of the knee.

49
Q

True or false: There is no center of rotation of the knee.

50
Q

True or False: Standing on your toes is a first class lever:

A

False: Second

51
Q

True or False: Muscle is a linear force generator

A

False: Nonlinear

52
Q

True or False: Pennet muscle generates more force then long ranged fibers

Material Science (2 decks)

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