Question

What two things must you know to describe the motion of an object?
Choosing a Frame of Reference (pages 328–329)
2. Is the following sentence true or false? A frame of reference is not
necessary to describe motion accurately and completely.
3. What is a frame of reference?
4. Movement in relation to a frame of reference is called
.
5. Imagine that you are a passenger in a car. Circle the letter of the best
frame of reference you could use to determine how fast the car is
moving relative to the ground.
a. the people sitting next to you in the backseat
b. the driver of the car
c. a van traveling in the lane next to your car
d. a sign post on the side of the road
Measuring Distance (page 329)
6. Distance is
.
7. Circle the letter of the SI unit best suited for measuring the length of
a room in your home.
a. kilometers
b. meters
c. centimeters
d. millimeters

Answer 1

1. You must know the object's position and the frame of reference (a reference point from which position is measured).
2. False.
3. A frame of reference is a set of reference points or a coordinate system (and associated observer) used to describe the position and motion of an object.
4. Movement in relation to a frame of reference is called motion (or relative motion).
5. d. a sign post on the side of the road
6. Distance is the length of the path between two points (how far an object has moved); it is a scalar.
7. b. meters