Chapter 2: Q 2-4 (page 81)

$I n o r d e r t o p u l l a s l e d a c r o s s a l e v e l f i e l d a t a c o n s \tan t v e l o c i t y y o u h a v e t o e x e r t a c o n s \tan t f o r c e . D o e s n ’ t t h i s v i o l a t e N e w t o n ’ s f i r s t a n d s e c o n d l a w s o f m o t i o n, w h i c h i m p l y t h a t n o f o r c e i s r e q u i r e d t o m a i n t a i n a c o n s \tan t v e l o c i t y ? E x p l a i n t h i s s e e m i n g c o n t r a d i c t i o n .$

Short Answer

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$T h u s, t h i s v i o l a t e s t h e f i r s t a n d t h e s e c o n d l a w s o f t h e m o t i o n$ .

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Significance of Newton’s first and second laws and friction.

$T h e f i r s t l a w s t a t e s t h a t a n o b j e c t m o v e s w i t h c o n s \tan t v e l o c i t y u n l e s s r e s i s t e d b y a n e x t e r n a l f o r c e . T h e s e c o n d l a w s t a t e s t h a t t h e r a t e o f t h e c h a n g e o f m o m e n t u m i s d i r e c t l y p r o p o r t i o n a l t o t h e a p p l i e d f o r c e a n d t h e d i r e c t i o n o f t h e f o r c e . F r i c t i o n i s t h e r e s i s \tan c e p r o v i d e d b y o n e s u r f a c e t o a n o t h e r s u r f a c e d u r i n g t h e m o v e m e n t o f t h e s u r f a c e .$

Determination of the violation of the Newton’s first and second law

$I n t h i s q u e s t i o n, f r i c t i o n i s o n e o f t h e l e a d i n g f o r c e s a c t i n g o n t h e s l e d w h i l e p u l l i n g i t . H o w e v e r, f r i c t i o n a c t s i n t h e o p p o s i t e d i r e c t i o n o f t h e o b j e c t ’ s m o t i o n w h i c h s i g n i f i e s f r i c t i o n c a n c e l s a n d c o u n t e r a c t s t h e f o r c e s t h a t c a u s e m o t i o n . H e n c e, i t e v e n t u a l l y l e a d s t o s m a l l e r a c c e l e r a t i o n a n d r e d u c e d n e t f o r c e . H e n c e, t h a t i s o n e o f t h e m a i n r e a s o n s f o r a p p l y i n g a c o n s \tan t f o r c e .$

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Short Answer

Step by step solution

Significance of Newton’s first and second laws and friction.

Determination of the violation of the Newton’s first and second law

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Inordertopullasledacrossalevelfieldataconstantvelocityyouhavetoexertaconstantforce.Doesn’tthisviolateNewton’sfirstandsecondlawsofmotion,whichimplythatnoforceisrequiredtomaintainaconstantvelocity?Explainthisseemingcontradiction.

Short Answer

Step by step solution

Significance of Newton’s first and second laws and friction.

Determination of the violation of the Newton’s first and second law

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

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Study anywhere. Anytime. Across all devices.