Practice Questions

<p>Contrast the nature of magnetic force with gravitational force based on their attractive or repulsive properties.</p>

<p>Identify the force that causes a charged plastic scale to attract small pieces of paper without touching them.</p>

<p>Recall why an object thrown vertically upwards eventually falls back down to the ground.</p>

<p>Define upthrust or buoyant force.</p>

<p>Demonstrate how applying brakes on a moving bicycle is an application of force to change its speed.</p>

<p>Name the type of force that results from the action of muscles in our body and provide one example.</p>

<p>Define gravitational force and describe its nature.</p>

<p>Define force in the context of science.</p>

<p>What is the SI unit of weight?</p>

<p>Demonstrate one observable effect of the buoyant force when an object is immersed in a liquid.</p>

<p>Sonali and Ragini found it harder to pedal their bicycles uphill and against the wind. Analyze how forces explain both these observations.</p>

<p>A cricket ball is hit and rolls across a grassy field. It gradually slows down and stops. Analyze the force responsible for this change in speed and its direction.</p>

<p>You are holding a metal paperclip near a strong magnet without touching it. The paperclip jumps and sticks to the magnet. Apply the concept of magnetic force to explain this phenomenon.</p>

<p>An object has a mass of $2$ kg. Calculate its weight on Earth and then analyze how its weight would change on the Moon, where the gravitational force is approximately one-sixth of that on Earth. Does its mass also change? (Assume Earth&#39;s gravity pulls $1$ kg with $10$ N force).</p>

<p>Examine three different situations from daily life where a force causes a change in the shape of an object.</p>

<p>Consider two balloons. One is charged by rubbing with a woollen cloth, and the other remains uncharged. Compare their interaction with small pieces of paper.</p>

<p>A spring balance shows a reading of $5$ N when a certain object is suspended from it. If this object were taken to a planet where the gravitational force is twice that of Earth, what would be the approximate reading on a similar spring balance there? Apply your understanding of weight.</p>

<p>Explain why a large ship made of steel can float on water, while a small steel coin sinks. Analyze the role of buoyant force and gravitational force in these scenarios.</p>

<p>Describe magnetic force and recall how like poles of magnets interact.</p>

<p>Compare and contrast muscular force and frictional force based on their nature of contact and direction relative to motion.</p>

<p>Analyze why it is easier to slip on a wet surface compared to a dry surface. Discuss the role of friction in both scenarios.</p>

<p>Distinguish between mass and weight, explaining how each is affected by location.</p>

<p>List three possible effects that a force can have on an object.</p>

<p>Define the force of friction and state its direction relative to the motion of an object.</p>

<p>Explain why at least two objects must interact for a force to come into play.</p>

<p>When a ball is thrown vertically upwards, it slows down, stops momentarily at the highest point, and then speeds up as it falls back down. Analyze the force acting on the ball throughout its motion and its effect on the ball&#39;s speed and direction.</p>

<p>After rubbing a plastic comb through dry hair, you bring it near tiny pieces of paper. The paper pieces are attracted to the comb without direct contact. Apply the concept of electrostatic force to explain this observation.</p>

<p>Explain the conditions that determine whether an object will float or sink in a liquid.</p>

<p>Summarize why a ball rolling on a flat ground eventually stops, even without an apparent push to stop it.</p>

<p>Explain the phenomenon of electrostatic attraction and repulsion between charged and uncharged bodies.</p>