Forces
Akopọ
Push, pull, stretch, squeeze, turn, stop: forces are behind every change in how an object moves or what shape it is. Understanding forces is the gateway to the whole of mechanics, and it is where Newton's famous ideas about motion begin.
In this lesson you will see how a force can change an object's size and shape, read a load-extension graph and find a spring constant, add forces along a line to get the resultant, and use \(F=ma\) to link force, mass and acceleration. You will also meet the idea that a force at right angles to motion makes an object travel in a circle.
Awọn Afojusun
- [Core] Know that forces may produce changes in the size, shape and motion of an object
- [Core] Determine the resultant of two or more forces acting along the same straight line
- [Core] Describe friction as the force between two surfaces that may impede relative motion and produce heating
- [Core] Know that friction (drag) acts on an object moving through a liquid
- [Core] Know that friction (drag) acts on an object moving through a gas (e.g. air resistance)
- [Core] Know that an object either remains at rest or continues in a straight line at constant speed unless there is a resultant force on the object
- [Supplement] Recall and use the equation F = ma and know that the resultant force and the acceleration are in the same direction
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Forces. 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.
- A load of 10 N stretches a spring by 0.05 m. The spring constant is: A. 0.5 N/m B. 2 N/m C. 50 N/m D. 200 N/m Answer: D
- A resultant force of 20 N acts on a 4 kg mass. The acceleration is: A. 0.2 m/s^2 B. 5 m/s^2 C. 24 m/s^2 D. 80 m/s^2 Answer: B
- An object moves at constant velocity. The resultant force on it is: A. equal to its weight B. zero C. equal to friction times two D. increasing Answer: B
- The limit of proportionality on a load-extension graph is where: A. the spring breaks B. extension is zero C. the line stops being straight D. the load is greatest Answer: C
- A force acting at right angles to the motion of an object causes it to: A. speed up B. slow down C. move in a circle D. stop Answer: C
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Forces? 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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