Need for Speed

Cars, bicycles, and people are all objects that can be in motion. What is true about motion?

• an object in motion is accelerating 

• motion is the change in position of an object. 

• an object in motion has no speed but it does have velocity

• gravity and friction are responsible for all motion 

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A roller coaster speeds up as it travels downhill and then slows as it enters a curve. Which statement best describes the motion of the roller coaster during this trip?

• velocity changes, but acceleration remains constant

• the velocity of the roller coaster remains constant 

• the roller coaster accelerates throughout the trip 

• the speed of the roller coaster remains constant 

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Jen is walking her dog at a constant rate. They keep a constant rate as they turn a corner. Why has their velocity changed?

• because their speed changed

• because their direction changed

• because their position changed 

• because their force changed

What changes as these children roll down the hill at a constant speed?

• velocity

• position

• acceleration

• speed 

The speed of an object in a particular direction is the definition of what? 

• friction 

• force

• motion

• velocity 

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a measure of an objects change in position during a certain amount of time is _________? 

• motion 

• force 

• friction 

• speed 

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an object accelerates when it does what

• speeds  up, slows down, or changes direction

• moves left or right

• reference point 

• puts force on an object 

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In this photo what is the best description of what is taking place 

• The velocity of the bicycles is changing 

• The speed is increasing

• the bicycles are not accelerating 

• the position of the bicycles is not changing 

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To calculate the speed of an object you need to know what two things? 

• distance and time

• time and velocity 

• gravity and distance

• length and width

The distance an object moves in a period of time is called its

• direction

• motion

• speed

• force

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