Mechanical Comprehension – Test 3 0% 62 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 Equilibrium is achieved when the forces on a system are: hyperactive inverse net net balanced Equilibrium is achieved when the forces on a system are balanced. Equilibrium is achieved when the forces on a system are balanced. 2 / 16 A metric system of units means that values can be calculated by factors of: infinity one mass 10 A metric system of units means that values can be calculated by factors of 10. A metric system of units means that values can be calculated by factors of 10. 3 / 16 What law does the force developed in a spring obey? Hooke's law Newton's 16th law of motion Law of Least Resistance Hamilton's law The force developed in a spring obeys Hooke's Law. The force developed in a spring obeys Hooke's Law. 4 / 16 When two external gears mesh, they always turn in what directions? lower opposite upward same When two external gears mesh, they always turn in the opposite directions. When two external gears mesh, they always turn in the opposite directions. 5 / 16 When two gears of unequal size (meaning an unequal number of teeth) are meshed together, the smaller of the two is usually called a: shaft rack flywheel pinion When two gears of unequal size are meshed together, the smaller of the two is usually called a pinion. When two gears of unequal size are meshed together, the smaller of the two is usually called a pinion. 6 / 16 Pressure is the amount of force within a specific: fluid container tube area Pressure is the amount of force within a specific area. Pressure is the amount of force within a specific area. 7 / 16 The Law of Conservation of Momentum states: total mass of a system remains the same Momentum requires opposing forces total momentum of a closed system cannot change momentum of an open system remains the same The Law of Conservation of Momentum states that the total momentum of a closed system cannot change. The Law of Conservation of Momentum states that the total momentum of a closed system cannot change. 8 / 16 An inclined plane permits you to overcome a large: inertia resistance fulcrum friction An inclined plane permits you to overcome a large resistance. An inclined plane permits you to overcome a large resistance. 9 / 16 What can used to change rotary motion into linear motion? miter bevel worm drive cams Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 10 / 16 What is the benefit of using ball bearings or roller bearings in a machine? metal is smoother than oil greater mass equals more friction rolling friction is less than sliding friction sliding friction is less than rolling friction The benefit of using ball bearings or roller bearings in a machine is that rolling friction is always less than sliding friction. The benefit of using ball bearings or roller bearings in a machine is that rolling friction is always less than sliding friction. 11 / 16 When two gears of unequal size are meshed together, the smaller of the two is usually called a: pinion flywheel shaft rack When two gears of unequal size are meshed together, the smaller of the two is usually called a pinion. When two gears of unequal size are meshed together, the smaller of the two is usually called a pinion. 12 / 16 Work done on a rigid body due to the sum of the torques integrated over the angle through with the body rotates is known as: mass work axle rotation torque rotational work Work done on a rigid body due to the sum of the torques integrated over the angle through with the body rotates is known as rotational work. Work done on a rigid body due to the sum of the torques integrated over the angle through with the body rotates is known as rotational work. 13 / 16 Third-class levers increase speed at the expense of: mass force friction speed Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 14 / 16 Pressure that is less than normal air pressure is called a: vacuum depression leak puncture Pressure that is less than normal air pressure is called a vacuum. Pressure that is less than normal air pressure is called a vacuum. 15 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: mass friction load effort In all machines, the actual mechanical advantage equals the resistance divided by the effort. In all machines, the actual mechanical advantage equals the resistance divided by the effort. 16 / 16 In what type of system does mass remain constant and the net external force on the system is zero? balanced system elastic system closed sytem frozen system In a closed system, mass remains constant and the net external force on the system is zero. In a closed system, mass remains constant and the net external force on the system is zero. Your score is 0% Exit