Newton’s Second Law Revisited (Grade 12 NSC Matric Physical Sciences): Quizzes

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Newton's Second Law Revisited
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What is the general form of Newton's Second Law?

Fˉnet=ΔpˉΔt\bar{F}_{\text{net}} = \frac{\Delta\bar{p}}{\Delta t}

What is Newton's Second Law formula when mass is constant?

Fˉnet=maˉnet\bar{F}_{\text{net}} = m\bar{a}_{\text{net}}

Why must direction be considered when solving momentum problems?

Momentum is a vector quantity

What happens to an object's momentum if no force acts on it?

Its momentum will not change

What is the formula for change in momentum?

Δpˉ=mvˉf−mvˉi\Delta\bar{p} = m\bar{v}_f - m\bar{v}_i

What is the second step in solving momentum problems?

Choose a frame of reference

A 0.058 kg ball hits a wall at 10 m/s and rebounds at 8 m/s. Find ∣Δpˉ∣|\Delta\bar{p}|.

1.04 kg·m·s⁻¹

A 0.8 kg ball strikes floor at 6 m/s down, bounces at 4 m/s up. Find ∣Δpˉ∣|\Delta\bar{p}|.

8.0 kg·m·s⁻¹

What must all final answers in momentum problems include?

Both magnitude and direction

What must be maintained throughout momentum calculations?

Consistency with chosen reference frame

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