3.19 R: Forces and Newton’s laws

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R1

Understand the concept of a force; understand and use Newton’s first law.

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R2

Understand and use Newton’s second law for motion in a straight line (restricted to forces in two perpendicular directions or simple cases of forces given as 2D vectors); extend to situations where forces need to be resolved (restricted to 2 dimensions).

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R3

Understand and use weight and motion in a straight line under gravity; gravitational acceleration, g , and its value in SI units to varying degrees of accuracy.

(The inverse square law for gravitation is not required and g may be assumed to be constant, but students should be aware that g is not a universal constant but depends on location).

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R4

Understand and use Newton’s third law; equilibrium of forces on a particle and motion in a straight line (restricted to forces in two perpendicular directions or simple cases of forces given as 2D vectors); application to problems involving smooth pulleys and connected particles; resolving forces in 2 dimensions; equilibrium of a particle under coplanar forces.

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R5

Understand and use addition of forces; resultant forces; dynamics for motion in a plane.

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R6

Understand and use the FμR model for friction; coefficient of friction; motion of a body on a rough surface; limiting friction and statics.