Constant Velocity Review

What is position?

• The separation between the object and the origin

• The "home base"

• The speed and direction of the object in motion

• how the object is moving

Answer explanation

Position refers to the separation between an object and a reference point, often called the origin. This definition distinguishes it from concepts like speed or direction, which describe motion rather than location.

What is the origin?

• The separation between the object and the origin

• a fixed point to measure everything else against

• How far the object is from the origin

• what the objects motion is

Answer explanation

The origin is defined as a fixed point to measure everything else against, providing a reference for location and distance in a coordinate system.

What is the slope of a position vs. time graph?

• speed

• acceleration

• position

• velocity

Answer explanation

The slope of a position vs. time graph represents the rate of change of position over time, which is defined as velocity. Therefore, the correct answer is velocity.

Tags

NGSS.MS-PS3-1

What is the area of a velocity vs. time graph?

• change in position

• change in time

• change in velocity

• chane in acceleration

Answer explanation

The area under a velocity vs. time graph represents the change in position (displacement) of an object over time. This is because velocity is the rate of change of position with respect to time.

How do we find slope?

• rise/run

• (y2-y1)/(x2-x1)

• count the squares

• y=mx+b

Answer explanation

The slope of a line is calculated using the formula 'rise/run', which represents the change in y over the change in x. This is also expressed as (y2-y1)/(x2-x1), confirming both choices are correct.

If a graph line on a position vs time graph is going up and to the right, the object is:

• moving away from the origin

• moving towards the origin

• getting faster

• getting slower

Answer explanation

A line going up and to the right on a position vs time graph indicates that the object's position is increasing over time, meaning it is moving away from the origin.

Tags

NGSS.MS-PS3-1

If the line on a position vs. time graph is flat, the object is:

• moving away from the origin

• going the same speed

• at rest

• slowing down

Answer explanation

A flat line on a position vs. time graph indicates that the position is not changing over time, meaning the object is at rest. It is not moving away from the origin, going the same speed, or slowing down.

Tags

NGSS.MS-PS3-1

If a graph line on a position vs time graph is going down and to the right, the object is:

• moving away from the origin

• moving towards the origin

• at rest

• getting slower

Answer explanation

A line going down and to the right on a position vs time graph indicates that the position is decreasing over time, meaning the object is moving towards the origin.

Tags

NGSS.MS-PS3-1

A steeper slope means the object is:

• going fast

• at rest

• going slow

• no moving

Answer explanation

A steeper slope on a graph indicates a greater change in position over time, which means the object is moving faster. Therefore, a steeper slope means the object is going fast.

Tags

NGSS.MS-PS3-1

If x=10m and t=2s what is v?

• 2 m/s

• 8 m/s

• 10 m/s

• 5 m/s

Answer explanation

To find velocity (v), use the formula v = x/t. Here, x = 10m and t = 2s. Thus, v = 10m / 2s = 5 m/s. Therefore, the correct answer is 5 m/s.