Physics Classroom Free Body Diagrams Newtons Law Review Answer
Newton's Laws of Motion Review
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Part D: Cartoon and Interpreting Free-Body Diagrams
37. Construct gratuitous-trunk diagrams for the post-obit physical situations at the instant in time for which they are described. Every bit is always washed in free-body diagrams, label the forces according to type and depict the arrows such that their length reflects the magnitude of the force.
| a. A book is at residue on peak of a table.  | b. A book is being pushed to the right across a table surface with a constant velocity. (Neglect Fair.)  | c. A volume is existence pushed to the right across a table surface and accelerating in the direction of the push. (Fail Fair.)  |
| d. A pupil is pushing lightly upon a big box in an endeavour to button it to the right across the floor, but the box fails to motility.  | e. A rightward-moving box (which was previously prepare into rightward motion beyond the floor) gradually slows to a end.  | f. An air track glider is gliding to the right at constant velocity.  (or replace the Fnorm with Fair) |
| grand. A ball is dropped from rest from the height of a edifice. (Neglect Fair.) | h. Several seconds subsequently being thrown, a football is moving up and rightwards towards the peak of its trajectory. (Neglect Fair.) | i. Several seconds after being thrown, a football reaches the precise top of its trajectory. (Neglect Fair.) |
| j. A falling skydiver is speeding up.  | 1000. A falling skydiver has reached a terminal velocity.  | l. Afterwards reaching a terminal velocity, a falling skydiver has opened her parachute.  |
| chiliad. A car is moving to the right at a high speed beyond a level roadway surface; the commuter's foot remains on the gas pedal.  | n. A car is skidding to a stop (with wheels locked) while traveling to the right across a level roadway surface. (Fair could exist added to Ffrict) | o. An lift (held by a cablevision) is moving upwards at a constant velocity. (Neglect Fair.)  |
| p. An upward moving elevator (held by a cable) slows down. (Neglect Fair.)  | q. A downwards moving elevator (held past a cable) slows downward. (Neglect Fair.)  | r. A picture hangs symmetrically by 2 wires oriented at angles to the vertical.  |
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Part E: Forcefulness-Mass-Dispatch Relationships
Construct free-body diagrams for the following objects; label the forces according to blazon. Use the approximation that k=10 m/stwo
to determine the magnitude of all forces and the net forcefulness and acceleration of the object.
| 38. A 2-kg box is at residue on a table.  ("At rest" would indicate a balance of forces and an dispatch of 0 m/due south/s.) | 39. A ii-kg box is free-falling from the tabular array to the ground.  ("Free-falling" indicates that the only force that influences the movement is the force of gravity.) | 40. A 2-kg box equipped with a parachute is falling at a final velocity subsequently beingness dropped from a plane.  (A "terminal velocity" indicates a abiding velocity and a rest of forces.) |
| 41. A 2-kg box is sliding to the right across a table. The force of friction upon the box is five Due north.  (Friction is directed contrary the movement and causes a leftward acceleration; no rightward force is spoken of, merely a rightward motion.) | 42. An eight-North strength is applied to a ii-kg box to move information technology to the right across the table at a constant velocity of one.five m/s.  (A "constant velocity" indicates an acceleration of 0 thousand/s/s and a rest of forces.) |
|  (The horizontal forces can be summed equally vectors; divide by the mass to obtain the acceleration value.) |  (A "abiding velocity" indicates an acceleration of 0 one thousand/s/south and a residuum of forces.) |
|  (Begin past multiplying m•a to find the internet force - thou N, down. The downward gravity force must be 1000 Due north more than the upwardly tension strength.) |  (Begin by multiplying m•a to decide the net force - 40 N, correct. The rightward practical force must be 40 N more than than the leftward friction force.) |
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