EFHS -- Describing Motion

To describe an object’s motion, what must be determined first?

• the slope

• the reference point

• the units per second

• the mass

 In a coordinate system, which axis is in the north-south direction?

• the y-axis

• the x-axis

• the reference axis

An athlete ran 50m in a straight line, then turned around and ran 100m in the opposite direction. What is the athlete's total distance?

• 100 m

• 50 m

• 150 m

• 0

An athlete ran 50m in a straight line, then turned around and ran 100m in the opposite direction. What is the athlete's displacement?

• 0

• 150 m

• 50 m

• -150 m

What is the SI unit of distance?

• the meter

• the centimeter

• the mile

• the yard

Which units can be used to measure speed? (there is more than one)

• m/s

• meters

• km/hr

• g/L

• grams

If an object has zero acceleration, what must be true?

• The object is not moving

• The object is falling

• The velocity is also zero

• The velocity is not changing

If the velocity of a moving object is  -25 m/s, what does this mean?

• The object is moving backwards

• The object has stopped for 25 seconds

• The object is going back in time

• The object is accelerating

What is the distance of the object from the reference point at 5 seconds?

• 350 m

• 150 m

• 50 m

• 0

How long did it take for the object to move 300 meters?

• 30 m/s

• 3 s

• 10 m/s

• 10 s