Momentum P
Akopọ
A bullet leaves a rifle at four hundred metres per second and a cricket ball leaves a bat at thirty. Which one is harder to stop? The honest answer is the cricket ball, and the quantity that says so is momentum. Speed on its own tells you almost nothing about how much effort an object will cost you to bring to rest. Mass on its own tells you almost nothing either. Multiply them together and you have the single number that governs every collision, every recoil and every crash on the planet.
This lesson builds that number from scratch and then uses it. You will learn to treat momentum as a directed quantity with a sign rather than a bare figure, apply the one law that lets you predict the outcome of a collision you have never seen, and finish with the equation that explains why a gymnast lands on a thick foam mat and a cricketer draws the hands back to take a catch. It is one of the few topics in the whole course where three short equations let you answer questions that look, at first sight, impossible.
Awọn Afojusun
- All moving objects have momentum. The relationship between momentum, p, mass, m, and velocity, v, is: p = m×v
- In a closed system the total momentum before an interaction is equal to the total momentum after the interaction. This is called conservation of momentum. Students may be required to complete calculations involving two objects. Examples of interactions are collisions and explosions.
- The relationship between force, F, change in momentum, ∆p, and time, t, is: F = ∆p / t ie the force equals the rate of change of momentum. Students should be able to use this relationship to explain qualitatively car safety features such as air bags, seat belts, side impact bars, crumple zones. Also, gymnasium crash mats, cushioned surfaces for playgrounds and cycle helmets.
Àwòrán ọpọlọ
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Akọ̀wé Ẹ̀kọ́
Àkọsílẹ̀ Ẹ̀kọ́ Pípé wà lórí Ohun Èlò Green Bridge
Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Momentum P. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- What is the unit of momentum? A. N B. J C. kg m/s D. m/s Answer: C
- Which pair of quantities are both vectors? A. Mass and speed B. Momentum and velocity C. Distance and time D. Energy and mass Answer: B
- A trolley of mass 4.0 kg moves at 2.5 m/s. What is its momentum? A. 1.6 kg m/s B. 6.5 kg m/s C. 10 kg m/s D. 20 kg m/s Answer: C
- Two identical carts roll towards each other at the same speed and stick together on impact. What is the total momentum of the pair immediately after the collision? A. Zero B. Twice the momentum of one cart before the collision C. The same as the momentum of one cart before the collision D. Greater than it was before the collision Answer: A
- A car is brought to rest in a collision. The change in momentum is the same, but the car is designed so that the collision lasts longer. What happens to the average force on the car? A. It increases B. It decreases C. It stays the same D. It becomes zero Answer: B
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Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Momentum P? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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