SME
Grade 5 Science · Problem type
The pull on a stack of washers
Use this for “How hard does gravity pull on a stack of 6 washers?”
Diagram
6 washers × 0.2 N = 1.2 N
This is an example. Type your own values to start a new problem.
Washers
×
Pull on one washer (N)
=
Pull on the stack (N)
Formulas
6 × 0.2 = 1.2
Washers × pull on one washer = pull on the stack
Assumptions
•
Gravity pulls every washer down. A spring scale measures the pull in newtons (N).
•
Each washer is pulled the same. More washers, more pull.
•
One newton is about the pull of gravity on a small apple.
Step-by-step
WE KNOW
Washers: 6
Pull on one washer: 0.2 N
FIND
pull on the stack
Step 1 · Find pull on the stack
6 × 0.2 = ?
Washers × pull on one washer = pull on the stack
The same pull for every washer: multiply by the washers.
6 × 2 tenths = 12 tenths
12 tenths = 1.2
Pull on the stack = 1.2 N
Check
Put the numbers back in. Both sides should match.
6 × 0.2 = 1.2 ✓
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Earth's gravity pulls objects down
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Ecosystems: matter and energy in food webs
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