Please select a subject first
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What is the force which produces an acceleration of 1 m /s2 in a body of mass 1 kg ?
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A girl weighing 25 kg stands on the tloor. She exerts a downward force of 250 N on the floor. What force does the floor exert on her ?
Concept: undefined >> undefined
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Fill in the following blanks with suitable words :
Forces in a Newton’s third law pair have equal _____________ but act in opposite _____________.
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Why does a gunman get a jerk on firing a bullet ?
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If action is always equal to reaction, explain why a cart pulled by a horse can be moved.
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Explain how a rocket works.
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Do action and reaction act on the same body or different bodies ? How are they related in magnitude and direction ? Are they simultaneous or not ?
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If a man jumps out from a boat, the boat moves backwards. Why ?
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Why is it difficult to walk on a slippery road ?
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Explain why, a runner presses the ground with his feet before he starts his run.
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Draw a diagram to show how a rocket engine provides a force to move the rocket upwards. Label the diagram appropriately.
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Name the law involved in the following situation :
when person A standing on roller skates pushes another person B (also standing on roller skates) and makes him move to the right side, then the person A himself gets moved to the left side by an equal distance.
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State Newton’s third law of motion and give two examples to illustrate the law.
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Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward.
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The density of gold is 19 g/cm3. Find the volume of 95 g of gold.
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What is the mass of 5 m3 of cement of density 3000 kg/m3 ?
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What is the density of a substance of mass 100 g and volume 10 cm3 ?
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What is the difference between the density and relative density of a substance ?
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If the relative density of a substance is 7.1, what will be its density in SI units ?
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Calculate the density of an object of volume 3 m3 and mass 9 kg. State whether this object will float or sink in water. Give reason for your answer.
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