{"id":246,"date":"2015-08-26T21:08:13","date_gmt":"2015-08-26T21:08:13","guid":{"rendered":"http:\/\/digitalobby.spu.edu\/energy\/?page_id=246"},"modified":"2023-11-26T23:41:01","modified_gmt":"2023-11-26T23:41:01","slug":"categorizing-forces","status":"publish","type":"page","link":"https:\/\/scholars.spu.edu\/seeley\/lane-seeley\/physics-learning-resources\/categorizing-forces\/","title":{"rendered":"Categorizing Forces"},"content":{"rendered":"

Contact Forces<\/h3>\n

Interactions which only<\/span> exist between\u00a0objects which are in contact.<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Name(s)<\/th>\nIllustration<\/th>\nLabel(s)<\/th>\nDescription<\/th>\nEquation(s)\/Questions<\/th>\nLinks<\/th>\n<\/tr>\n<\/thead>\n
Normal Force<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{F}_{n}\\) or \\(\\vec{n}\\)<\/td>\nPushing force which is perpendicular (normal) to the interface where two surfaces are in contact<\/td>\nUsually only as large as is needed<\/a><\/td>\n<\/td>\n<\/tr>\n
Force of Static Friction<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{f}_{s}\\)<\/td>\nPushing force which is parallel to the interface where two surfaces are in contact and are not<\/span> moving relative to one another. \u00a0In a direction to prevent the relative motion of the surfaces.<\/td>\n\\(\\left |\\vec{f}_{s} \\right |\\leq \\mu_{s}\\left |\\vec{n} \\right |\\)When is it less than\u00a0and when is it equal?<\/a><\/span><\/td>\nPhET Ramp<\/a><\/td>\n<\/tr>\n
Force of Kinetic Friction<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{f}_{k}\\)<\/td>\nPushing force which is parallel to the interface where two surfaces are in contact and are<\/span>\u00a0moving (slipping) relative to one another. \u00a0In a direction which opposes the relative motion of the surfaces.<\/td>\n\\(\\left |\\vec{f}_{k} \\right |=\\mu_{k}\\left |\\vec{n} \\right |\\)<\/td>\nPhET Forces and Motion<\/a><\/td>\n<\/tr>\n
Rolling Friction<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{f}_{r}\\)<\/td>\nPushing force between a rolling object and a surface which impedes the motion of the rolling object across the surface. \u00a0This force interaction results in the conversion of kinetic energy into thermal energy.<\/td>\n\\(\\left |\\vec{f}_{r} \\right |= \\mu_{r}\\left |\\vec{n} \\right |\\)<\/td>\n<\/td>\n<\/tr>\n
Tension<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{T}\\)<\/td>\nPulling force between an object such as a string, rope, or wire and some other object<\/td>\nUsually only as large as is needed<\/a>Massless strings?<\/a><\/span><\/td>\nPhET Forces and Motion<\/a><\/td>\n<\/tr>\n
Spring or Elastic Force<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{F}_{sp}\\)<\/td>\nPulling or pushing force between an elastic object\u00a0such as a spring or rubber band\u00a0and some other object<\/td>\n\\(\\vec{F}_{sp}=-k\\vec{\\Delta x}\\)<\/td>\nPhET Masses and Springs<\/a><\/td>\n<\/tr>\n
Drag<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{F}_{D}\\) or \\(\\vec{D}\\)<\/td>\nPushing force which impedes the motion of an object through a fluid<\/td>\n\\(F_{D}=\\frac{1}{2}CA\\rho v^{2}\\)<\/td>\n<\/td>\n<\/tr>\n
Thrust<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{F}_{th}\\)<\/td>\nPushing force between a jet or rocket engine and the fuel which is expelled by the engine.<\/td>\nThrust can also describe the pushing force between a propeller and the fluid through which the propeller is rotating.<\/td>\n<\/td>\n<\/tr>\n
Buoyant\u00a0Force<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{F}_{B}\\)<\/td>\nPushing force between a submerged or partially submerged object and the fluid which surrounds it<\/td>\n\\({F}_{B}\\)=weight of fluid displaced<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/h3>\n

Non-Contact Forces<\/h3>\n

Interactions which can<\/span> exist between objects which are not in contact.<\/strong><\/h4>\n\n\n\n\n\n\n\n
Name(s)<\/th>\nIllustration<\/th>\nLabel(s)<\/th>\nDescription<\/th>\nEquation(s)<\/th>\nLinks<\/th>\n<\/tr>\n<\/thead>\n
Gravitational Force or Weight<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{F}_{G}\\) or\u00a0\\(\\vec{W}\\)<\/td>\nAttractive force between two massive objects<\/td>\n\\(F_{G}=mg\\) or\u00a0\\(F_{G}=-\\frac{Gm_{1}m_{2}}{r_{1,2}^2}\\)Which equation is right?<\/a><\/td>\nPhET Gravity Force Lab<\/a><\/td>\n<\/tr>\n
Electrostatic Force<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{F}_{E}\\)<\/td>\nAttractive or repulsive force between two charged\u00a0objects<\/td>\n\\(F_{E}=\\frac{kq_{1}q_{2}}{r_{1,2}^2}\\)<\/td>\n<\/td>\n<\/tr>\n
Magnetic Force<\/strong><\/td>\n\"\"<\/td>\n\\(\\vec{F}_{M}\\)<\/td>\nAttractive or repulsive force between two magnetic\u00a0objects<\/td>\n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Contact Forces Interactions which only exist between\u00a0objects which are in contact. Name(s) Illustration Label(s) Description Equation(s)\/Questions Links Normal Force or Pushing force […]<\/p>\n","protected":false},"author":12,"featured_media":0,"parent":377,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-templates\/page_fullwidth.php","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"class_list":["post-246","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/scholars.spu.edu\/seeley\/wp-json\/wp\/v2\/pages\/246","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/scholars.spu.edu\/seeley\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/scholars.spu.edu\/seeley\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/scholars.spu.edu\/seeley\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/scholars.spu.edu\/seeley\/wp-json\/wp\/v2\/comments?post=246"}],"version-history":[{"count":40,"href":"https:\/\/scholars.spu.edu\/seeley\/wp-json\/wp\/v2\/pages\/246\/revisions"}],"predecessor-version":[{"id":826,"href":"https:\/\/scholars.spu.edu\/seeley\/wp-json\/wp\/v2\/pages\/246\/revisions\/826"}],"up":[{"embeddable":true,"href":"https:\/\/scholars.spu.edu\/seeley\/wp-json\/wp\/v2\/pages\/377"}],"wp:attachment":[{"href":"https:\/\/scholars.spu.edu\/seeley\/wp-json\/wp\/v2\/media?parent=246"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}