Physics 1 – Nov 14, 2017 P3 Challenge –

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Presentation transcript:

Physics 1 – Nov 14, 2017 P3 Challenge – Draw the freebody diagram for a box on an incline being pulled up the incline with a cord parallel to the incline when a) the incline is frictionless and b) when the incline has friction. Resolve gravity into its two components for both FBDs. Today’s Objective: Review for test Get out the “Multibodies and Inclines” worksheet HMK for check.

Agenda, Assignment IB 2.2 Forces Assignment: Agenda Review Study for test Agenda Practice Problems for simpler cases for test review Review of homework problems on friction on incline Additional practice problems via ppt.

Test outline 11 x 2 pts Multiple choice 4 x 5 pts Drawing FBDs 1 x 10 pts Fnet = ma 1D coupled with kinematics. 1 x 12 pts 2D second law prob (no friction, no angles) 1 x 12 pts 2D second law prob (no friction, with forces at angles) 2 x 12 pts 2D second law prob (friction, no inclines)

Practice Problem w/ kinematics The Top Thrill Dragster Stratocaster at Cedar Point Amusement Park in Ohio uses a hydraulic launching system to accelerate riders from 0 to 54 m/s in 3.8 seconds before climbing a completely vertical 128 m hill. Determine the net force required to accelerate an 86-kg man.

2nd Law Problem with angles Determine the two tensions if the man’s mass is 63.0 kg.

Friction Practice A 25.0 kg block is at rest on a table with a coefficient of dynamic friction of 0.11 and a coefficient of static friction of 0.18. A) What will happen if a force of 30.0 N is applied? If it moves, find the acceleration. If it doesn’t move, determine the force of static friction? B) What minimum force is needed to make the block start to move? C) What is the acceleration of the block if you continue to push with the force found in part b) while the block is moving? D) What force is needed to make the block slide at a constant rate?

Exit Slip - Assignment When is it a good idea to rotate the axes for your frame of reference? What’s Due? (Pending assignments to complete.) Study for the Test on Nov 16 (w/o friction on incline or multibody systems.) What’s Next? (How to prepare for the next day) Read p57-75