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