SME
Grade 4 Science · Physical Science
Energy and speed; energy transfer in collisions
Use this for “A ball rolls 200 cm in 4 seconds. How far does it go each second?”
Diagram
0, 50, 100, 150, 200
Distance each second: 50 cm
Time: 4 seconds
Track length: 200 cm
This is an example. Type your own values to start a new problem.
Distance each second (cm)
each
second
×
Time (seconds)
=
Track length (cm)
Formulas
50 × 4 = 200
Distance each second × time = track length
Assumptions
•
Speed is how far something moves each second.
•
A faster ball has more energy: it pushes a cup farther when it hits.
•
Time the ball with a stopwatch from the first mark to the last mark.
Step-by-step
WE KNOW
Track length: 200 cm
Time: 4 seconds
FIND
distance each second
Step 1 · Find distance each second
? × 4 = 200
Distance each second × time = track length
Divide the track length by the seconds: the distance the ball rolls each second.
Distance each second = 200 ÷ 4
Distance each second = 50 cm
Check
Put the numbers back in. Both sides should match.
50 × 4 = 200 ✓
Topic check
See what you know: 5 questions on this topic
New questions each time. Pass to mark it complete.