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Flashcards in C4 Terms Deck (86)
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61

What symbol should you use to identify a system's position in one-dimensional motion?

x

62

What quantity does the formula for speed provided?

Average speed

63

Acceleration can occur if velocity changes _________, ___________ or both.

magnitude
direction

64

(T/F)Negative acceleration always means a system is slowing down.

False. Negative acceleration means that an acceleration is occurring in the negative direction of the coordinate system.

65

Contrast views of Greeks and scientists after Galileo & Newton.

4.1 Greeks - matter behaved in mysterious ways. After Galilieo/Newton, scientists observe how things move and then describe their motion with math.

66

How does kinematics differ from dynamics?

kinematics - how things move, dynamics - what makes them move.

67

A skier is schussing down a snowy slope. Describe everything that is part of the skier-system.

Jacket, snowpants, skis, poles, helmet, goggles, boots, gloves.

68

On a flight simulator game. What is the reference frame for the computer image?

The cockpit.

69

What evidence do we have that time began at creation?

Time began at creation. Gen 1:1

70

A vector quantity can be represented by a stylized arrow. How does this symbol represent a vector quantity.

The length of the vector arrow indicates the size of the scalar value and the direction the arrow points is the direction of the vector

71

When would actual distance traveled = the magnitude of a system's displacement?

The displacement and distance traveled are = when an object has traveled in a straight line in one direction between two points.

72

Explain why speed is a rate?

It compares the change in the value of a quantity in a certain span of time.

73

Explain why acceleration is a rate?

It is the rate of change of the speed or velocity during a given time interval.

74

What instrument displays the instantaneous speed of a car (the speed a car is moving at an instant in time)?

The speedometer.

75

What is significant about the sign of velocity in one dimensional motion?

It indicates the direction the objects are moving.

76

What kind of coordinate system is required to describe most real-world motion? Why?

Two and three dimensional motion.
Most real world motion occurs in these.

77

(T/F) In mechanics it is vital to understand how to measure motion before you try to understand the causes of motion.

True.

78

(T/F)When studying the motion of a thrown ball, the system is the ball and the hand that throws it.

True.

79

(T/F)The weather-vane on top of a barn measures the wind vector.

True.

80

(T/F) Position in a 1 dimensional requires only a single number.

True.

81

(T/F) The magnitude of -15.0 m/s is 15.0 m/s

True.

82

(T/F) * The instantaneous speed of a car must equal it's average speed at least once during a trip.

True.

83

(T/F) In most cases of motion, scientists try to avoid measuring velocities because it complicates measuring the data.

False.

84

(T/F) Increasing speed always indicates positive acceleration and decreasing speed always indicates negative acceleration.

False.

85

(T/F) Acceleration is the rate of change of the rate of change of position.

True.

86

(T/F) The definition of distances, displacement, speed, velocity and acceleration are the same in 1,2,or 3 dimensional coordinate systems.

True.