Question

Give reasons for the following
1. Pushing a car is easier than pushing a truck .
2. Why does a fall on a hard surface hurt more than a fall on a sandy surface ?
3. Why does a fielder pull his arms back while trying to stop/catch a cricket ball ?
4. Why cars are provided with seat belts ?
5. How does a karate player break a pile of tiles or a slab of ice in a single blow .

please answer this it is very important
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Answer 1

1. Higher the mass higher the Inertia.

2. When you jump onto the concrete surface, your feet are brought to rest almost instantaneously because the rate of change of momentum is very high. Hence, you get injured due to a large force on your body on account of the hard floor.

3.When a fielder stops a fast moving ball suddenly, change in momentum is brought about in a very short time, and hence a large force acts on the fielder's hand.

4.Inertia is the reason that people in cars need to wear seat belts. ... When the driver applies the brakes, an unbalanced force is applied to the car. So, to reduce chances of any injury ,seat belts are provided to all the cars.or all the cars are provided with seat belts to prevent accidents.

5.A karate player can break a pile of tiles with a single blow because he strikes the pile with his hand very fast. In doing so, the large momentum of his hand is reduced to zero in a very short time. This exerts a large force on the pile of tiles which is sufficient to break them apart.

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Answer 2

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$\underline\mathfrak\red{Answer \: 1:}$

Pushing a car is easier than pushing a truck because the truck is much more heavier in comparison to the car due to which truck will experience high inertia.

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$\underline\mathfrak\orange{Answer \: 2:}$

Falling on hard surface hurts more as compared to you falling on a sandy surface because :

When we fall on hard surface the change in momentum of a body is very fast and hence we experience a higher force. This causes more pain.

But , on a sandy surface the change in momentum of the body is much slower and hence we experience lesser force.

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$\underline\mathfrak\blue{Answer \: 3:}$

Fielder pull back the arm a little bit while catching a cricket ball so as to decrease the rate of change of momentum of the ball.

This would decrease the force exerted by the cricket ball on the hand.

Hence , the fielder would not get hurt while catching the ball.

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$\underline\mathfrak\purple{Answer \: 4: }$

Cars are provided with seat belts as safety devices.

If the car suddenly stops due to inertia of motion the passengers have a tendency to move forward and might hit the dashboard of the car.

Seat belts prevent this forward motion during sudden stopping of the car and hence prevents accident of the passengers.

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$\underline\mathfrak\green{Answer \: 5:}$

Karate players are able to break a whole pile of brick at one blow because they exert a huge momentum on the the pile of brick.

The rate of change of momentum of the hand is very high resulting in generation of a high force.

This high force can break the whole pile of bricks.

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$\underline\mathfrak{hope \: it \: helps...}$