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