# Forces In The Mechanical System: Question Preview (ID: 1381)

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 When an object has had its shape or direction of motion changed, it has been acted upon by a a) mass. b) spring scale. c) force. d) scalar. Which of the following is used to measure the weight (force of gravity) on an object? a) spring scale b) balance scale c) torque wrench d) ruler Which of the following statements is correct? a) SI unit of force = Newton; English unit of force = pound b) Si unit of force = pound; English unit of force = Newton c) SI unit of force = newton-meters; English unit of length = inch-pound d) SI unit of force = Newton; English unit of force = pound-mass If two forces acting on an object are equal in magnitude but opposite in direction, the object is said to be a) unbalanced. b) slowing down. c) speeding up. d) in equilibrium. Which of the following is a vector quantity? a) 70 degrees Fahrenheit b) 50 pounds c) 100 mi/hr due east d) 12 pm Which of the following is a scalar quantity? a) 105 miles per hour, up b) 100 degrees Celsius c) 15 N, due east d) 21 revolutions per second, clockwise Which of the following is INCORRECT when adding vectors graphically? a) They are added head to tail. b) They are drawn to a scale. c) They are drawn in any direction. d) The resultant is the sum of all the vectors. Three forces act on a crate. The first force is 2 lb, right, the second force is 4 lb, left, and the third force is 3 lb left. Which of the following is true? a) The resultant force is 5 lb, left. b) The resultant force is 5 lb, right. c) The resultant force is 3 lb, left. d) The resultant force is 3 lb, right. Which of the following statements correctly describes the difference between mass and weight? a) Weight changes with a change in location; mass remains the same with a change in location. b) Weight is dependent only on the amount of matter in an object; mass is dependent on the force of gravity. c) The unit of weight is kilograms; the unit of mass is newtons. d) Weight is measured with a balance; mass is measured with a spring scale. Torque is a) the product of the length (in pounds) and the force (in feet). b) the product of the force applied and the length of the lever arm. c) the product of the force (in pounds) and the length (in newtons). d) the speed at which a body rotates.
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