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ICSE Class 8 Work, Energy and Power — practice questions

Explore 42 free Work, Energy and Power questions in ICSE Class 8 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Work, Energy and Power questions and exercises with answers

Showing questions 1–30 of 42.

For force along motion, work is the product of which pair?Read the answer and worked solution →A person holds a load stationary. Work done on the load during the hold?Read the answer and worked solution →Which pair of quantities has the SI unit joule?Read the answer and worked solution →A constant 12 N force moves a box 3 m along the force. Its work?Read the answer and worked solution →An object's kinetic energy is associated with its?Read the answer and worked solution →A 2 kg trolley moves at 3 m/s. Its kinetic energy is?Read the answer and worked solution →At unchanged speed, doubling a body's mass makes its kinetic energy?Read the answer and worked solution →Potential energy is stored because of a body's?Read the answer and worked solution →A 3 kg load is 4 m above ground. GPE relative to ground? g = 10 m/s².Read the answer and worked solution →If GPE is zero at the floor, the height in mgh is measured from?Read the answer and worked solution →A load is lifted steadily. Work against gravity mainly increases its?Read the answer and worked solution →A ball falls freely without air resistance. The main conversion is?Read the answer and worked solution →At an ideal pendulum's turning point, its bob has?Read the answer and worked solution →Where does an ideal pendulum have its greatest kinetic energy?Read the answer and worked solution →Air drag slows a pendulum. Its energy accounting includes?Read the answer and worked solution →For an isolated system, which quantity remains conserved?Read the answer and worked solution →An electric motor's useful energy conversion is?Read the answer and worked solution →A generator driven by a rotating shaft mainly converts?Read the answer and worked solution →A battery supplying a circuit chiefly converts?Read the answer and worked solution →Power describes the?Read the answer and worked solution →One watt is equivalent to?Read the answer and worked solution →A force does 60 J over 5 m along its direction. Its constant magnitude?Read the answer and worked solution →Push a crate 3 m with 4 N, then 2 m with 6 N, both along motion. Total work?Read the answer and worked solution →A force is halved but its along-force displacement doubles. Work becomes?Read the answer and worked solution →The speed of a fixed-mass object triples. Its kinetic energy becomes?Read the answer and worked solution →A 2 kg body has 25 J of kinetic energy. Its speed?Read the answer and worked solution →A 2 kg object rises from 2 m to 5 m above ground. GPE gain? g = 10 m/s².Read the answer and worked solution →A 2 kg load at 6 m and a 4 kg load have equal GPE above ground. Latter height?Read the answer and worked solution →Ideal pendulum: two intermediate points at equal height. Speeds?Read the answer and worked solution →Stored water drives a turbine and generator. Main energy sequence?Read the answer and worked solution →

Worked practice questions

For force along motion, work is the product of which pair?

  1. Force and elapsed time
  2. Mass and vertical height
  3. Mass and travel speed
  4. Force and displacement
Show answer and solution

Correct answer: D. Force and displacement

With the force along the motion, work equals force multiplied by displacement.

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A person holds a load stationary. Work done on the load during the hold?

  1. Its mass times holding time
  2. Zero, since displacement is zero
  3. Its weight times holding time
  4. Its weight divided by holding time
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Correct answer: B. Zero, since displacement is zero

The stationary load has no displacement, so the supporting force does no mechanical work on it.

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Which pair of quantities has the SI unit joule?

  1. Force and energy
  2. Work and power
  3. Power and force
  4. Work and energy
Show answer and solution

Correct answer: D. Work and energy

Both work and energy are measured in joules, while power uses watts and force uses newtons.

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