# 8th Grade- Motion Vocabulary For Test: Question Preview (ID: 25941)

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**A 'frame of reference' can be defined as**

a) a meeting point

b) a system of objects that are not moving with respect to one another

c) how fast something is moving

d) a how fast something is moving in a direction

**Relative motion is**

a) a system of objects that are not moving with respect to one another

b) movement in relation to a frame of reference

c) how fast something is moving

d) how fast something is moving in a direction

**Distance can be defined as**

a) the length of the path between two points

b) how fast something is moving in a direction

c) movement in relation to a frame of reference

d) a system of objects that are not moving with respect to one another

**A vector is**

a) a quantity that has a direction associated with it

b) a system of objects that are not moving with respect to one another

c) the length of the path between two points

d) a meeting point

**Acceleration can be defined as**

a) the rate at which velocity changes

b) distance /time

c) the length of the path between two points

d) a quantity that has a direction associated with it

**Speed is**

a) the ratio of the distance an object moves to the amount of time the object moves

b) a quantity that has a direction associated with it

c) the length of the path between two points

d) the rate at which velocity changes

**Average speed is**

a) the total distance traveled divided by the time it takes to travel that distance

b) the rate at which velocity changes

c) the rate at which an object is moving at a given moment in time

d) a quantity that has a direction associated with it

**Instantaneous speed is**

a) the rate at which an object is moving at a given moment in time

b) the total distance traveled divided by the time it takes to travel that distance

c) a quantity that has a direction associated with it

d) the rate at which velocity changes

**Velocity can be defined as**

a) the speed and direction an object is moving, measured relative to a reference point

b) the rate at which velocity changes

c) the total distance traveled divided by the time it takes to travel that distance

d) the ratio of the distance an object moves to the amount of time the object moves

**Free fall can be defined as**

a) the movement of an object toward Earth because of gravity (the acceleration due to gravity)

b) the rate at which velocity changes

c) the ratio of the distance an object moves to the amount of time the object moves

d) the total distance traveled divided by the time it takes to travel that distance

**Constant acceleration is**

a) a steady change in velocity

b) a quick change in velocity

c) when the object stops moving

d) there is no change in velocity

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