Newtons Laws (III) Blocks on ramps, and other

Newtons Laws (III)  Blocks on ramps, and other

Newtons Laws (III) Blocks on ramps, and other problems Serway and Jewett : 5.7, 5.8 Physics 1D03 - Lecture 8 1 Doing problems with F=ma Draw the free-body diagram carefully. You may need to know the direction of a from kinematics, before considering forces (for friction).

Any axes will do, but some choices make the algebra simpler set up equations for each direction. You need one (scalar) equation for each (scalar) unknown, in general (but, the mass will often cancel out). Physics 1D03 - Lecture 8 2 Example: Show that the contact forces are equal FA

Physics 1D03 - Lecture 8 3 Accelerated motion Example: A block slides down a ramp, with friction v Assume m, , k are known, and find the acceleration.

m Physics 1D03 - Lecture 8 4 Accelerated motion Example: A block is pushed with a force FA at an angle to the horizontal, find the acceleration. Friction is given by k. FA

m Physics 1D03 - Lecture 8 5 Example Obtain an expression for the stopping distance for a skier moving down a slope with friction with an initial speed of v1. d

Find the distance given that k=0.18, v=20m/s and =5.0. Physics 1D03 - Lecture 8 6 Question : Can we calculate s ? mg f n Increasing so that max , the block slips, from

which we get: s tan max This is an easy method of measuring s Physics 1D03 - Lecture 8 7 Frictionless surfaces, ideal pulleys, etc. M

For what angle is the system in equilibrium? m Physics 1D03 - Lecture 8 8 Summary Problems using Newtons Second Law:

Set up free-body diagram, then F ma, and solve. Practice Problems : Chapter 5 Problems: 43, 46 (ans: 31.7-48.6N), (5th ed) Problems 49, 53 Physics 1D03 - Lecture 8 9

Recently Viewed Presentations

  • Water Allocation Committee Watauga River Basin Water Resources

    Water Allocation Committee Watauga River Basin Water Resources

    Basin plans shall provide that all point and nonpoint sources of pollutants jointly share responsibility in reducing pollutants in the State's waters [§143-215.8B(b)(1)] Basin plans should also include information about all transfers in and out of the basin as required...
  • Chapter 7

    Chapter 7

    net salvage value used when expenses incurred in disposing of property; cash outflows must be deducted from cash inflows for final net salvage value. with classical methods of depreciation, estimated salvage value is established and used. with MACRS, the salvage...
  • Introduction to Level 2 Stroke Awareness Award SCM201

    Introduction to Level 2 Stroke Awareness Award SCM201

    Introduction to Level 2 Stroke Awareness Award SCM201 Introductions Jade Matravers Mapa training and staff development officer 01743254815 [email protected] Nicola Jessop Administration Support Learning Disabilities 01743 254734 [email protected] Gail Marshall Social Care and Health Training & Assessment Centre 01948 660100...
  • Applying Gov 2.0 in a Gov 1.0 world - West Central Initiative

    Applying Gov 2.0 in a Gov 1.0 world - West Central Initiative

    Each works in a different manner and has different uses, but they all share the same characteristics of being driven by user-generated content and community participation. ... Periscope is a mobile app connected to Twitter that enables nonprofits to easily...
  • Brief Cognitive Assessment based on Consensus Standards in ...

    Brief Cognitive Assessment based on Consensus Standards in ...

    Identify a brief assessment tool for cognition in MS. can be used by health care professionals who are not cognitive specialists. has international validation. Specify an international validation protocol that can be implemented in any country. Agree guidelines on test-retest...
  • Marketing Strategy: Based on First Principles and Data

    Marketing Strategy: Based on First Principles and Data

    Grow market size (new products and services, lower prices) Grow share (better products and services than competition, higher loyalty to retain, and/or steal customers with acquisition strategies) Better prices and margins (improve loyalty, brand image, relationships, products, targeting of high...
  • Distributed Approximate Spectral Clustering for Large-Scale ...

    Distributed Approximate Spectral Clustering for Large-Scale ...

    "Distributed approximate spectral clustering for large-scale datasets." Proceedings of the 21st international symposium on High-Performance Parallel and Distributed Computing . ACM, 2012.
  • DNA Structure and Replication Review!

    DNA Structure and Replication Review!

    DNA is in the shape of a double helix (twisted ladder). These Scientists realized that the double helix accounted for Franklin's X-ray pattern, and it explained Chargaff's rule of base pairing and how the 2 strands of DNA are held...