Force in Mechanical Systems Objectives Measuring Force Units Definitions

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Force in Mechanical Systems Objectives Measuring Force Units Definitions

Lipsitz, Jane, Executive Producer has reference to this Academic Journal, PHwiki organized this Journal Force in Mechanical Systems Objectives Define as long as ce, in addition to describe how as long as ces are measured. Describe what happens when as long as ces on an object are balanced in addition to when they are unbalanced. Explain the meaning of Newton’s first law of motion. Define scalar, vector, weight, mass, in addition to torque. Determine the resultant as long as ce on an object when two or more as long as ces act on it. Solve problems involving as long as ce, lever arm, in addition to torque. Ways to transmit mechanical as long as ces!

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Measuring Force Metric System (SI- Systems International) English Units English Length – foot (ft) Force – Pound (lb) SI Length – meter (m) Force – Newton (N) Conversions 1 pound = 16 ounces 1 pound = 4.45 newtons 1 kilogram = 1000 grams 1 kg = 9.8 N = 2.2 lb 1 slug = 32.2 lb 1 slug = 14.59 kg Definitions Force Weight Mass Vector – has magnitude in addition to direction Scalar – quantity described by only a magnitude. (temp., time, pressure, mass) Not the same thing Amount of matter in an object Takes into account gravity

Drawing Forces Draw as an arrow. Length of the arrow is proportional to the magnitude of the vector. Head points in the direction of the vector. 20º 3” 1 inch = 20 lb. Terms Balanced as long as ces Unbalanced as long as ces Net as long as ce Equilibrium Newton’s First Law of Motion (law of inertia) Every object will remain at rest, or will continue to move in a straight line with constant speed, unless the object is acted on by a net as long as ce. Inertia – the property of an object to resist changes in its motion. Adding Forces Draw the 40 lb. Force Add the 30 lb. Force to the 40 lb. Force (head to tail method) Draw the resultant as long as ce Determine magnitude in addition to direction of resultant Form conclusion.

Example Terms Torque – the quantity that causes rotation in mechanical systems. (cw or ccw) =F x L (Greek letter “tau”) Torque = Applied Force x length of lever arm

Summary A as long as ce is a push or a pull. Force is a vector. It has both magnitude in addition to direction. Its magnitude is measured in pounds or in newtons. Newton’s first law says that an object will remain at rest or will continue to move in a straight line unless it is acted on by a net as long as ce. Unbalanced as long as ces result in a net as long as ce acting on an object. Balanced as long as ces result in no net as long as ce acting on an object. If two as long as ces act on an object in addition to the as long as ces act in a straight line, the magnitude of the resultant is either the sum of or the difference between the two as long as ces’ magnitudes. Summary (cont.) If two as long as ces act on an object in addition to the as long as ces do not act in a straight line, the resultant can be found using the head-to-tail method of vector addition. The mass of an object is a measure of the object’s inertia. The weight is a measure of the as long as ce exerted on the object by gravity. A torque is exerted on a body when a as long as ce is applied in addition to the line of action of the as long as ce does not pass through the body’s axis of rotation. The torque equals the as long as ce times the lever arm If no net torque is exerted on a body, it will remain at rest or will continue to rotate at a constant rate. (TLS 16)

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Lipsitz, Jane Executive Producer

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