Chapter 1 Motion in a Straight Line (Defs.)

Question 1

The study of motion.

Answer 1

Kinematics

Question 2

A change in an object’s location as measured by a particular observer.

Answer 2

Motion

Question 3

The total length of the path travelled by an object in motion.

Answer 3

Distance (d)

Question 4

The line an object moves along from a particular starting point.

Answer 4

Direction

Question 5

A quantity that has only magnitude (size).

Answer 5

Scalar

Question 6

A quantity that has magnitude (size) and direction.

Answer 6

Vector

Question 7

The distance and direction of an object from a reference point.

Answer 7

Position (d->)

Question 8

The change in position of an object.

Answer 8

Displacement (Δd->)

Question 9

A vector diagram drawn using a specific scale.

Answer 9

Vector scale diagram

Question 10

A straight line between two points with a specific direction.

Answer 10

Directed line segment

Question 11

The total distance travelled divided by the total time taken to travel that distance.

Answer 11

Average speed (Vav)

Question 12

The total displacement, or change in position, divided by the total time for that displacement.

Answer 12

Average velocity (V->av)

Question 13

A graph describing the motion of an object, with position on the vertical axis and time on the horizontal axis.

Answer 13

Position-time graph (d-> -t)

Question 14

A measure of the steepness of a line.

Answer 14

Slope (m) = rise/run

Question 15

Vertical change between two points on a line.

Answer 15

Rise

Question 16

Horizontal change between two points on a line.

Answer 16

Run

Question 17

Motion of an object at a constant speed in a straight line.

Answer 17

Motion with uniform or constant velocity

Question 18

Motion in which the object’s speed changes or the object does not travel in a straight line.

Answer 18

Motion with non-uniform velocity (accelerated motion)

Question 19

How quickly an object’s velocity changes over time (rate of change of velocity).

Answer 19

Acceleration (a-> av)

Question 20

A graph describing the motion of an object, with velocity on the vertical axis and time on the horizontal axis.

Answer 20

Velocity-time graph (v-> -t)

Question 21

Motion in which velocity changes at a constant rate.

Answer 21

Motion with uniform acceleration

Question 22

The velocity of an object at a specific instant in time.

Answer 22

Instantaneous velocity (V-> inst)

Question 23

Line to a curve at a given point is the straight line that “just touches” the curve at that point. Only one point.

Answer 23

Tangent

Question 24

Represents the instantaneous velocity at the point of tangency.

Answer 24

Slope of the tangent

Question 25

A graph describing motion of an object, with acceleration on the vertical axis and time on the horizontal axis.

Answer 25

Acceleration-time graph (a-> -t)

Question 26

The acceleration that occurs when an object is allowed to fall freely; close to Earth’s surface, g has a value of 9.8 m/s^2.

Answer 26

Acceleration due to gravity (g)

Question 27

The acceleration due to gravity of an object in the absence of air resistance.

Answer 27

Free fall

Question 28

The velocity of an object when the force due to air resistance equals the force due to gravity on the object. 200 km/h.

Answer 28

Terminal velocity