FÍSICA Y QUÍMICA 3º DE E.S.O. 3rd TERM UNIT 4: FORCES IN NATURE 4_4_Free-body diagrams

Bloque 4. El movimiento y las fuerzas. 4.1. Las fuerzas. Efectos de las fuerzas. 4.2. Fuerzas de especial interés: peso, normal, rozamiento, fuerza elástica. 4.3. Principales fuerzas de la naturaleza: gravitatoria, eléctrica y magnética. Criterios de evaluación C.E.4.1. Reconocer el papel de las fuerzas como causa de los cambios en el estado de movimiento y de las deformaciones. Estándares de aprendizaje evaluables E.A.4.1.1. En situaciones de la vida cotidiana, identifica las fuerzas que intervienen y las relaciona con sus correspondientes efectos en la deformación o en la alteración del estado de movimiento de un cuerpo. E.A.4.1.2. Establece la relación entre el alargamiento producido en un muelle y las fuerzas que han producido esos alargamientos, describiendo el material a utilizar y el procedimiento a seguir para ello y poder comprobarlo experimentalmente. E.A.4.1.3. Establece la relación entre una fuerza y su correspondiente efecto en la deformación o la alteración del estado de movimiento de un cuerpo. E.A.4.1.4. Describe la utilidad del dinamómetro para medir la fuerza elástica y registra los resultados en tablas y representaciones gráficas expresando el resultado experimental C.E.4.5. Comprender y explicar el papel que juega el rozamiento en la vida cotidiana. E.A.4.5.1.Analiza los efectos de las fuerzas de rozamiento y su influencia en el movimiento de los seres vivos y los vehículos. C.E.4.6. Considerar la fuerza gravitatoria como la responsable del peso de los cuerpos, de los movimientos orbitales y de los distintos niveles de agrupación en el Universo, y analizar los factores de los que depende. E.A.4.6.1.Relaciona cualitativamente la fuerza de gravedad que existe entre dos cuerpos con las masas de los mismos y la distancia que los separa. E.A.4.6.2. Distingue entre masa y peso calculando el valor de la aceleración de la gravedad a partir de la relación entre ambas magnitudes. E.A.4.6.3. Reconoce que la fuerza de gravedad mantiene a los planetas girando alrededor del Sol, y a la Luna alrededor de nuestro planeta, justificando el motivo por el que esta atracción no lleva a la colisión de los dos cuerpos.

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FREE-BODY DIAGRAM AND RESULTANT OF THE FORCES

Construct the free-body diagram of an elevator that is at rest with a man inside

An orangutan weighing 500 N hangs from a vertical rope. What is the tension in the rope?

An orangutan weighing 500 N hangs from a vertical rope. What is the tension in the rope?

An orangutan weighing 500 N hangs from a vertical rope. What is the tension in the rope?

An orangutan weighing 500 N hangs from a vertical rope. What is the tension in the rope?

An orangutan weighing 500 N hangs from a vertical rope. What is the tension in the rope?

T = w = 500 N An orangutan weighing 500 N hangs from a vertical rope. What is the tension in the rope? T = w = 500 N

Construct the free-body diagrams for the various situations described below. 1. A book is at rest on a tabletop. Diagram the forces acting on the book. 2. A gymnast holding onto a bar, is suspended motionless in mid-air. The bar is supported by two ropes that attach to the ceiling. Diagram the forces acting on the combination of gymnast and bar. 3. An egg is free-falling from a nest in a tree. Neglect air resistance. Diagram the forces acting on the egg as it is falling. 4. A flying squirrel is gliding (no wing flaps) from a tree to the ground at constant velocity. Consider air resistance. Diagram the forces acting on the squirrel. 5. A rightward force is applied to a book in order to move it across a desk with a rightward acceleration. Consider frictional forces. Neglect air resistance. Diagram the forces acting on the book. 6. A rightward force is applied to a book in order to move it across a desk at constant velocity. Consider frictional forces. Neglect air resistance. Diagram the forces acting on the book.

8. A college student rests a backpack upon his shoulder 8. A college student rests a backpack upon his shoulder. The pack is suspended motionless by one strap from one shoulder. Diagram the vertical forces acting on the backpack. 9. A skydiver is descending with a constant velocity. Consider air resistance. Diagram the forces acting upon the skydiver. 10. A force is applied to the right to drag a sled across loosely packed snow with a rightward acceleration. Neglect air resistance. Diagram the forces acting upon the sled. 11. A football is moving upwards towards its peak after having been booted by the punter. Neglect air resistance. Diagram the forces acting upon the football as it rises upward towards its peak. 12. A car is coasting to the right and slowing down. Neglect air resistance. Diagram the forces acting upon the car.

Construct the free-body diagrams for the various situations described below. 1. A book is at rest on a tabletop. 2. A gymnast holding onto a bar, is suspended motionless in mid-air. The bar is supported by two ropes that attach to the ceiling. 3. An egg is free-falling from a nest in a tree. Neglect air resistance.

Construct the free-body diagrams for the various situations described below. 4. A flying squirrel is gliding (no wing flaps) from a tree to the ground at constant velocity. Consider air resistance. 5. A rightward force is applied to a book in order to move it across a desk with a rightward acceleration. Consider frictional forces. Neglect air resistance. 6. A rightward force is applied to a book in order to move it across a desk at constant velocity. Consider frictional forces. Neglect air resistance.

Construct the free-body diagrams for the various situations described below. 7. A college student rests a backpack upon his shoulder. The pack is suspended motionless by one strap from one shoulder. 8. A skydiver is descending with a constant velocity. 9. A force is applied to the right to drag a sled across loosely packed snow with a rightward acceleration. Neglect air resistance.

Construct the free-body diagrams for the various situations described below. 10. A football is moving upwards towards its peak after having been booted by the punter. Neglect air resistance. 11. A car is coasting to the right and slowing down.

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