1 / 12

Newton’s Laws

Learning Objective :. Newton’s Laws. To look at Newton’s Laws of Motions and to connect all recent work to them. To understand terminal velocity. Book Reference : Pages 138-139.

shino
Download Presentation

Newton’s Laws

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Learning Objective : Newton’s Laws • To look at Newton’s Laws of Motions and to connect all recent work to them. • To understand terminal velocity Book Reference : Pages 138-139

  2. "A body continues to maintain its state of rest or of uniform motion unless acted upon by an external unbalanced force." Newton’s First Law For an object to change: speed, direction or shape there must be a resultant unbalanced force. No unbalanced force : things stay as they are

  3. "F = ma: the net force on an object is equal to the mass of the object multiplied by its acceleration." Newton’s Second Law

  4. "To every action there is an equal and opposite reaction." Newton’s Third Law If object A exerts a force F on object B, then object B also exerts a force, (of the same magnitude but opposite direction) on A Normal Reaction (Support forces)

  5. When an object is moving through a fluid (gas or liquid), the object experiences drag. The size of this drag is related to the speed of the object. If the object is accelerating, eventually the size of the drag will equal the size of the force causing the acceleration. The object will no longer accelerate, a constant velocity will have been reached We call this the terminal velocity Terminal Velocity

  6. Factors affecting terminal velocity • The shape : • More streamlined-> higher terminal velocity • The Viscosity of the fluid: • The thicker, (more viscous) the fluid the lower the terminal velocity Terminal Velocity

  7. TV problems are often applied to falling objects (Freefall Parachutists for example) Initially the object will be accelerated by gravity since there is initially no drag since the initial velocity is zero.As the vertical downwards velocity builds the drag force increases until eventually the forces are balanced and a terminal velocity is reached Terminal Velocity Freefall

  8. The top speed of a vehicle is governed by its terminal velocity. For a given power of engine a streamlined car will have a higher top speed than a non-streamlined one At the top end of the speed range, the engine must produce increasing large amounts of power for relatively small gains in top speed Terminal Velocity (Car Design)

  9. BugattiVeyron (2004) 252.2 MPH, 1001 BHP Koenigsegg CCX (2006) 250 MPH, 900 BHP Saleen S7 (2005) 248 MPH, 750 BHP McLaren F1 (1994) 240.14 MPH, 620 BHP Ferrari Enzo (2002) 217 MPH, 657 BHP Jaguar XJ220 (1992) 217 MPH, 549 BHP Pagani Zonda F (1999) 215 MPH, 602 BHP Lamborghini Murcielago (2003) 213 MPH, 633 BHP Some Figures....

  10. When I’m cruising at a constant speed of 70mph down the motorway... I’m not accelerating so why do I even need to have the engine switched on? But it’s not only top speed.... A yellow boxfish

  11. At a constant speed on level ground, the power produced by the engine is only working against resistance... Air resistance and friction from the tyres Fuel Efficiency.... Mercedes Bionic (Concept Car) Around 70 mpg (miles per gallon)

More Related