Year 13 in England

12th grade forces and motion

3 12th 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

Horizontal projectiles: time of flight and range

CCSS NGSS.HS-PS2-1England: A level Physics: Projectile motion (extension)

Example

A ball is kicked horizontally off a cliff 45 m high. Ignoring air resistance, how long does it take to reach the beach below, in s? (g = 9.8 m/s²; give 2 decimal places)

t = √(2 × 45 ÷ 9.8) = 3.03
So the answer is: 3.03 s

Answer: 3.03 s

Builds on: Uniform acceleration: v² − u² = 2 a s

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Newton's law of gravitation and field strength

CCSS NGSS.HS-PS2-4England: A level Physics: Gravitational fields (extension)

Example

One of two masses is multiplied by 2 and the distance stays the same. By what factor does the gravitational force change? (F = G m₁ m₂ ÷ r²)

× 2
So the answer is: 2

Answer: 2

Builds on: Mass and weight (W = mg), Orbits and orbital speed (v = 2πr / T)

Leads to: Coulomb's law: force between charges

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Circular motion and centripetal force

CCSS NGSS.HS-PS2-1CCSS NGSS.HS-PS2-4England: A level Physics: Circular motion (extension)

Example

A 1 kg object moves in a circle of radius 2 m at 5 m/s. What centripetal force is needed, in N? (F = m v² ÷ r)

1 × 5² ÷ 2 = 12.5
So the answer is: 12.5 N

Answer: 12.5 N

Builds on: Orbits and orbital speed (v = 2πr / T), Force, mass and acceleration (F = ma)

Print a worksheet ✏️ Write on screen Flashcards

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