# Aakanksha

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Viewing 10 posts - 1,101 through 1,110 (of 1,476 total)
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• #9310
Aakanksha
Participant

During the ride, pillion rider and driver are in a state of motion. But when the driver applies brakes, the body of pillion rider continues moving forward on account of inertia of motion. Therefore, the pillion rider falls forward.

#9309
Aakanksha
Participant

One newton.

in reply to: State the law of conservation of momentum. #9308
Aakanksha
Participant

It states that the sum of momenta of the two objects before collision is equal to the sum of momenta after the collision, provided there is no external unbalanced force on them. In other words, the initial momentum of the two objects is unchanged or conserved.

#9307
Aakanksha
Participant

Apical Meristem:

It is present at the root apex and the shoot apex. The shoot apical meristem is present at the tip of the shoots and its active division results in the elongation of the stem and formation of new leaves. The root apical meristem helps in root elongation.

#9305
Aakanksha
Participant

As the man jumps out from a moving train, his feet suddenly come to rest on touching the ground while his body’s upper part continues to move forward. For this reason he falls with his head forward. So as to save himself, he should run through some distance in the forward direction.

in reply to: State Newton's three laws of motion. #9301
Aakanksha
Participant

Newton’s law of motion. Newton’s three laws may be stated as follows :

First Law. A body at rest or in uniform motion will remain at rest or in uniform motion unless an unbalanaced force acts upon it.

Second Law. The rate of change of momentum of a body is directly proportional to the applied unbalanced force and the change takes place in the direction of the force.

Third Law. Action and reaction are equal and opposite and they act on different bodies.

#9299
Aakanksha
Participant

Phycomycetes- This group of fungi includes members such as Rhizopus, Albugo, etc.

(i) Mode of nutrition

They are obligate parasites on plants or are found on decaying matter such as wood.

(ii) Mode of reproduction

Asexual reproduction takes place through motile zoospores or non6motile aplanospores that are produced endogenously in sporangium. Sexual reproduction may be of isogamous, anisogamous, or oogamous type. It results in the formation of thick6walled zygospore.

in reply to: On which factors does friction depend ? #9296
Aakanksha
Participant

The force of friction is directly proportional to the weight of the body sliding over the surface. The force of friction also depends on the nature of the surfaces in contact.

Aakanksha
Participant

Ans. Friction is a very important force in our daily life. Some advantages of friction are :

(1) It is due to the friction between the road and the soles of our shoes that we are able to walk.

(2) The nails and screws hold the wooden boards together due to friction.

(3) The friction between the road and the surface of the tyre permits safe driving.

(4) The application of brakes to stop a scooter or car etc. is possible only due to friction.

#9294
Aakanksha
Participant