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Physics · Grades 9–12

Signed linear momentum

Use consistent SI units and keep the stated direction convention.

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Rule and assumptions

Use consistent SI units and keep the stated direction convention.

p = mv

Worked examples

A 30 kg object has signed velocity -3 m/s on a chosen axis. Find its signed momentum. Round to 3 decimal places if needed. Answer in kg·m/s.

p = mv 30 × (-3) = -90

-90 kg·m/s

A 18 kg object has signed velocity -7 m/s on a chosen axis. Find its signed momentum. Round to 3 decimal places if needed. Answer in kg·m/s.

p = mv 18 × (-7) = -126

-126 kg·m/s

Try two questions

  1. A 13 kg object has signed velocity -7 m/s on a chosen axis. Find its signed momentum. Round to 3 decimal places if needed. Answer in kg·m/s.

  2. A 4 kg object has signed velocity -3 m/s on a chosen axis. Find its signed momentum. Round to 3 decimal places if needed. Answer in kg·m/s.

Answers and reasoning

Answers and marking notes
  1. -91 kg·m/s

    p = mv 13 × (-7) = -91

  2. -12 kg·m/s

    p = mv 4 × (-3) = -12

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.

Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.