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