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ICSE Class 9 Work and Energy — practice questions

Explore 27 free Work and Energy questions in ICSE Class 9 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Work and Energy questions and exercises with answers

Showing questions 1–27 of 27.

Newton's first law of motion describes:Read the answer and worked solution →The SI unit of linear momentum is:Read the answer and worked solution →Which is a non-contact force?Read the answer and worked solution →The SI unit of force is the newton. One newton equals:Read the answer and worked solution →Which form of Newton's second law of motion is most general?Read the answer and worked solution →A body of mass 2 kg starts from rest and reaches 6 m per second in 3 s. The applied force is:Read the answer and worked solution →A 100 g bullet leaves a gun with a velocity of 200 m per second. The bullet's momentum is:Read the answer and worked solution →A boy jumps off a moving bus and falls forward. The reason is:Read the answer and worked solution →A rocket moves forward by expelling gases backward. This is an application of:Read the answer and worked solution →When a cricketer lowers his hands while catching a ball, the force on his hands:Read the answer and worked solution →Two bodies have equal momentum. Which one has the LARGER kinetic energy?Read the answer and worked solution →A 0.2 kg ball moving at 10 m per second is brought to rest in 0.05 s. The average force on the ball is:Read the answer and worked solution →A 1000 kg car is brought to rest in 5 seconds from 20 m per second. The braking force needed is:Read the answer and worked solution →A man weighs 60 kgf on Earth. His weight in newtons is:Read the answer and worked solution →A gun of mass 4 kg fires a 0.02 kg bullet at 200 m per second. By conservation of momentum, the recoil velocity of the gun is:Read the answer and worked solution →True or false: what Aristotle got wrongRead the answer and worked solution →Complete Newton's first lawRead the answer and worked solution →Which law is this?Read the answer and worked solution →MomentumRead the answer and worked solution →True or false: inertia and forceRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every statement the first law licensesRead the answer and worked solution →Flip and pair: name with contributionRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the historical argumentRead the answer and worked solution →

Worked practice questions

Newton's first law of motion describes:

  1. Action and reaction pairs
  2. Gravitational attraction
  3. Conservation of energy
  4. Inertia of a body
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Correct answer: D. Inertia of a body

1. Newton's first law says a body keeps its state of rest or uniform motion in a straight line until an external force acts on it. 2. This tendency to resist any change in state is called inertia. 3. Action and reaction pairs are described by Newton's third law. 4. So Newton's first law introduces the property of inertia. _Source: Selina Concise Physics ICSE Class 9, Ch 3 'Laws of Motion' (aplustopper.com extract)_

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The SI unit of linear momentum is:

  1. kilogram metre per second
  2. newton per second
  3. newton second squared
  4. kilogram per second
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Correct answer: A. kilogram metre per second

1. Linear momentum is defined as the product of mass and velocity (p = m·v). 2. Mass has the SI unit kilogram and velocity has m per second. 3. Multiplying them gives kilogram metre per second. 4. So the SI unit of momentum is kilogram metre per second. _Source: Selina Concise Physics ICSE Class 9, Ch 3 'Laws of Motion' (aplustopper.com extract)_

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Which is a non-contact force?

  1. Friction
  2. Gravitational force
  3. Tension in a string
  4. Normal reaction
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Correct answer: B. Gravitational force

1. Contact forces act only when two bodies are in physical contact, such as friction and tension. 2. Gravitational force acts between two masses across empty space. 3. Therefore gravity is a non-contact force. 4. Friction, tension and normal reaction all require direct contact. _Source: Selina Concise Physics ICSE Class 9, Ch 3 'Laws of Motion' (aplustopper.com extract)_

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More Physics topics

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