Year 10 in England

9th grade forces and motion

4 9th grade forces and motion skills, each with a worked example, free practice that checks every answer, and a printable worksheet. Start with a mixed review, or jump to the skill you need.

Mixed review

Ten questions drawn from every skill below.

Print a review worksheet Riddle puzzle on screen Bingo

Force, mass and acceleration (F = ma)

CCSS NGSS.HS-PS2-1England: KS4 Combined Science: Forces and motion

Example

What resultant force is needed to accelerate a 80 kg mass at 2.5 m/s²?

F = 80 × 2.5 = 200
So the answer is: 200 N

Answer: 200 N

Builds on: Newton's laws of motion, Mass and weight (W = mg)

Leads to: Momentum (p = m v), Circular motion and centripetal force

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Acceleration

CCSS NGSS.HS-PS2-1England: KS4 Combined Science: Forces and motion

Example

A car speeds up from 0 m/s to 6 m/s in 6 s. What is its acceleration, in m/s²?

(6 − 0) ÷ 6 = 1
So the answer is: 1 m/s²

Answer: 1 m/s²

Builds on: Speed = distance ÷ time

Leads to: Read velocity–time graphs: gradient and motion, Stopping distances: thinking and braking

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Read velocity–time graphs: gradient and motion

CCSS NGSS.HS-PS2-1CCSS NGSS.SEP 4England: GCSE Combined Science: Forces (velocity–time graphs)

Builds on: Acceleration, Distance–time graphs

Leads to: Distance from the area under a velocity–time graph

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Stopping distances: thinking and braking

CCSS NGSS.HS-PS2-1CCSS NGSS.HS-ETS1-2England: GCSE Combined Science: Forces (stopping distance)

Example

A driver travelling at 25 m/s has a reaction time of 0.7 s. What is the thinking distance, in m?

25 × 0.7 = 17.5
So the answer is: 17.5 m

Answer: 17.5 m

Builds on: Speed = distance ÷ time, Acceleration

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