Question
Why do the blades of a pair of scissors have sharp edges?
✓
Answer
The pressure produced by a given force depends on the area of the surface on which the force acts. The less the surface! area, the greater is the pressure produced, The blades of a pair of scissors have sharp edges so that the area is decreased and hence the pressure is increased. This makes cutting • an object such as cloth easier.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Classify the following substances into acidic, basic and neutral group:
$HCl , NaCl , MgO , KCl , CaO , H _2 SO _4, HNO _3, H _2 O$ and $Na _2 CO _3$.
→$HCl , NaCl , MgO , KCl , CaO , H _2 SO _4, HNO _3, H _2 O$ and $Na _2 CO _3$.
Why do school bags have broad shoulder straps?
Explain why the capillary tube of a clinical thermometer has a constriction.
State whether the body will float or sink in a liquid if the density of the body is 1. greater than that of the liquid 2. less than that of the liquid 3. equal to that of the liquid.
Describe a simple experiment to demonstrate atmospheric pressure.
Write the effects: If the Sun disappears ………..
Explain : Bubbles are seen on adding lemon juice to baking soda.
Bubbles are seen on adding lemon juice to baking soda.
A thin metal disc of surface area 500 cm 2 at $0^{\circ} C$ is heated to $40^{\circ} C$. Find the increase in the surface area of the disc. $\left(\sigma=4 \times 10^{-5}{ }^{\circ} C { }^{-1}\right)$
→