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