Energy (HSC SSCE Physics): Quizzes

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Energy
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What are the two fundamental forms of energy in physics?

Kinetic and potential

In the kinetic energy formula Ek=12mv2E_k = \frac{1}{2}mv^2, what does vv represent?

Velocity in m⋅s−1\text{m} \cdot \text{s}^{-1}

Why is energy described as a scalar quantity?

It only has magnitude, no direction

To what does potential energy belong?

A system of objects

What is 1 joule equal to in base SI units?

1 kg⋅m2⋅s−21\text{ kg} \cdot \text{m}^2 \cdot \text{s}^{-2}

What is the formula for gravitational potential energy?

Ug=mghU_g = mgh

In the work formula W=Fscos⁡θW = Fs\cos\theta, what does θ\theta represent?

Angle between force and displacement

When is the work done by a force positive?

When force is in direction of motion

What does the work-energy theorem state?

Wnet=ΔEkW_{\text{net}} = \Delta E_k

When is conservation of mechanical energy an approximation?

When friction and air resistance exist

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Forces, Acceleration, and Energy

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