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9th grade · Science · Unit 10 of 11

Forces, Motion & Momentum

Newton's second law, momentum and safer collisions.

What your child practices

Practices Newton's second law (F = ma), momentum and its conservation, and designing devices that reduce the force of a collision.

California Content Standards learning standard: HS-PS2-1; HS-PS2-2; HS-PS2-3 · Newton's second law, conservation of momentum, and designs that reduce collision forces

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    A rocket moves forward because…

    • air pulls it
    • gravity pushes it up
    • gases pushed backward push the rocket forward
    • it has no mass

  2. Question 2

    A car's crumple zone is designed to…

    • make the car stiffer
    • increase impact force
    • absorb energy and lengthen collision time
    • add weight only

  3. Question 3

    The SI unit of force is the…

    • joule
    • watt
    • pascal
    • newton

  4. Question 4

    A 2 kg cart accelerates at 3 m/s². What net force acts on it?

    • 1.5 N
    • 5 N
    • 9 N
    • 6 N

  5. Question 5

    Newton's second law is…

    • V = IR
    • p = F/t²
    • F = ma
    • E = mc²

  6. Question 6

    A 2 kg cart at 3 m/s hits a 1 kg cart at rest and they stick. Their speed after is…

    • 6 m/s
    • 3 m/s
    • 2 m/s
    • 1 m/s

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