##### 1-D Kinematics - Lesson 1 - Describing Motion with Words

Scalar

quantities that are fully described by a magnitude (or numerical value) alone.

Vector

quantities that are fully described by both a magnitude and a direction.

Scalar or Vector?

5m

Scalar

Scalar or Vector?

length

Scalar

Scalar or Vector?

30 m/sec, East

Vector

Scalar or Vector?

acceleration

Vector

Scalar or Vector?

5 mi., North

Vector

Scalar or Vector?

density

Scalar

Scalar or Vector?

20 degrees Celsius

Scalar

Scalar or Vector?

temperature

Scalar

Scalar or Vector?

256 bytes

Scalar

Scalar or Vector?

time

Scalar

Scalar or Vector?

4000 Calories

Scalar

Scalar or Vector?

force

Vector

Scalar or Vector?

drag

Vector

Scalar or Vector?

displacement

Vector

Scalar or Vector?

momentum

Vector

Scalar or Vector?

pressure

Scalar

Scalar or Vector?

mass

Scalar

Scalar or Vector?

lift

Vector

Displacement

a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.

Distance

a scalar quantity that refers to "how much ground an object has covered" during its motion.

Speed

a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance.

Velocity

a vector quantity that refers to "the rate at which an object changes its position."

Instantaneous Speed

speed at a particular instant in time.

Average speed

a measure of the distance traveled in a given period of time

Acceleration

a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.

Constant Acceleration

an accelerating object will change its velocity by the same amount each second

negative acceleration

1) an object is slowing down

2) an object is speeding up in the opposite direction

posotive acceleration

1) an object is speeding up

2) an object is slowing down in the opposite direction