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? frozen system elastic system balanced 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. 2 / 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 pinion shaft 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. 3 / 16 What law does the force developed in a spring obey? Law of Least Resistance Hamilton's law Newton's 16th law of motion 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 Pressure that is less than normal air pressure is called a: depression puncture vacuum 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. 5 / 16 Equilibrium is achieved when the forces on a system are: inverse hyperactive balanced net net Equilibrium is achieved when the forces on a system are balanced. Equilibrium is achieved when the forces on a system are balanced. 6 / 16 The Law of Conservation of Momentum states: total momentum of a closed system cannot change momentum of an open system remains the same Momentum requires opposing forces total mass of a 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. 7 / 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: torque axle rotation rotational work mass 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. 8 / 16 An inclined plane permits you to overcome a large: resistance inertia fulcrum friction An inclined plane permits you to overcome a large resistance. An inclined plane permits you to overcome a large resistance. 9 / 16 When two gears of unequal size are meshed together, the smaller of the two is usually called a: pinion rack flywheel 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. 10 / 16 What is the benefit of using ball bearings or roller bearings in a machine? rolling friction is less than sliding friction greater mass equals more friction metal is smoother than oil 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 A metric system of units means that values can be calculated by factors of: mass 10 one 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. 12 / 16 Third-class levers increase speed at the expense of: mass friction speed force Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 13 / 16 What can used to change rotary motion into linear motion? miter worm drive bevel cams Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 14 / 16 Pressure is the amount of force within a specific: container tube fluid area Pressure is the amount of force within a specific area. Pressure is the amount of force within a specific area. 15 / 16 When two external gears mesh, they always turn in what directions? same opposite lower upward When two external gears mesh, they always turn in the opposite directions. When two external gears mesh, they always turn in the opposite directions. 16 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: friction load effort mass 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