Year 8 in England

7th grade forces and motion

3 7th 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

Mass and weight (W = mg)

CCSS NGSS.MS-PS2-4CCSS NGSS.HS-PS2-4England: KS3 Physics: Motion and forces (forces)England: KS4 Combined Science: Forces

Example

What is the weight of a 75 kg object on Earth? Use g = 9.8 N/kg.

W = 75 × 9.8 = 735
So the answer is: 735 N

Answer: 735 N

Builds on: Gravity

Leads to: Moments and levers, Force, mass and acceleration (F = ma), Kinetic and gravitational potential energy, Pressure = force ÷ area

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Pressure = force ÷ area

CCSS NGSS.MS-PS2-2England: KS3 Physics: Motion and forces (pressure)England: GCSE Physics: Forces (pressure)

Example

A force of 40 N acts on an area of 2 m². What is the pressure, in pascals (Pa)?

40 ÷ 2 = 20
So the answer is: 20 Pa

Answer: 20 Pa

Builds on: Mass and weight (W = mg)

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Stretching springs: extension and Hooke's law

CCSS NGSS.MS-PS2-2CCSS NGSS.HS-PS2-1England: KS3 Physics: Motion and forces (forces and elasticity)England: GCSE Combined Science: Forces (required practical: force and extension)

Example

A spring is 15 cm long. When a weight is hung on it, it is 17 cm long. What is the extension, in cm?

17 − 15 = 2
So the answer is: 2 cm

Answer: 2 cm

Builds on: Mass and weight (W = mg)

Leads to: Energy stored in a stretched spring (E = ½ k e²)

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