3rd grade · Science · Unit 2 of 10
Speed & Motion
Fast and slow, why things keep moving, and what changes how quickly motion changes.
What your child practices
Practices speed as the distance an object travels in a certain time, inertia (objects keep doing what they are doing until a force acts), and how mass and force affect how quickly motion changes.
Oregon State Standards learning standard: 3.PS2.1; 3.PS2.2 · how forces change motion and patterns that predict motion
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
A cyclist goes 10 m in 1 second. A runner goes 5 m in 1 second. Who is faster?
- the runner
- the cyclist
- they are the same
the cyclist
Hint: More distance in the same time means faster.
Question 2
Which unit could measure the time something takes?
- liters
- seconds
- meters
seconds
Hint: Time is measured in seconds, minutes and hours.
Question 3
An object at rest stays at rest unless…
- a force acts on it
- it is tired
- it gets hungry
a force acts on it
Hint: This idea is called inertia.
Question 4
A rolling ball keeps going until a force…
- thanks it
- gives it a name
- slows or stops it
slows or stops it
Hint: Forces change motion.
Question 5
Speed is found by thinking about distance and…
- color
- price
- time
time
Hint: Speed describes distance over time.
Question 6
Which object is moving at constant speed?
- An elevator moving 1 floor every 2 seconds the whole way
- A car braking
- A ball being dropped and speeding up
An elevator moving 1 floor every 2 seconds the whole way
Hint: Constant speed means the speed does not change.