Mechanical Comprehension – Test 3 0% 62 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 When two external gears mesh, they always turn in what directions? upward opposite lower 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. 2 / 16 Pressure that is less than normal air pressure is called a: vacuum puncture depression leak 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 When two gears of unequal size (meaning an unequal number of teeth) are meshed together, the smaller of the two is usually called a: pinion shaft rack flywheel 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. 4 / 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. 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 Equilibrium is achieved when the forces on a system are: net net balanced 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 When two gears of unequal size 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. 8 / 16 Third-class levers increase speed at the expense of: force mass friction speed Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 9 / 16 What law does the force developed in a spring obey? Newton's 16th law of motion Law of Least Resistance Hooke's law Hamilton's law The force developed in a spring obeys Hooke's Law. The force developed in a spring obeys Hooke's Law. 10 / 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. 11 / 16 Pressure is the amount of force within a specific: area fluid tube container Pressure is the amount of force within a specific area. Pressure is the amount of force within a specific area. 12 / 16 What is the benefit of using ball bearings or roller bearings in a machine? rolling friction is less than sliding friction sliding friction is less than rolling friction greater mass equals more 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. 13 / 16 In what type of system does mass remain constant and the net external force on the system is zero? balanced system elastic system frozen system closed sytem 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. 14 / 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: axle rotation mass work rotational work torque 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. 15 / 16 A metric system of units means that values can be calculated by factors of: one 10 mass infinity 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. 16 / 16 An inclined plane permits you to overcome a large: fulcrum friction inertia resistance An inclined plane permits you to overcome a large resistance. An inclined plane permits you to overcome a large resistance. Your score is 0% Exit