Mechanical Comprehension – Test 3 0% 62 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 Pressure that is less than normal air pressure is called a: puncture vacuum 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. 2 / 16 Third-class levers increase speed at the expense of: mass speed force friction Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 3 / 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. 4 / 16 The Law of Conservation of Momentum states: total mass of a system remains the same Momentum requires opposing forces total momentum of a closed system cannot change 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. 5 / 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. 6 / 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 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. 7 / 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 metal is smoother than oil 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. 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: rotational work torque mass 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. 9 / 16 In what type of system does mass remain constant and the net external force on the system is zero? closed sytem frozen system 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. 10 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: effort friction 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. 11 / 16 Equilibrium is achieved when the forces on a system are: hyperactive net net balanced inverse Equilibrium is achieved when the forces on a system are balanced. Equilibrium is achieved when the forces on a system are balanced. 12 / 16 What can used to change rotary motion into linear motion? cams worm drive miter bevel Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 13 / 16 What law does the force developed in a spring obey? Hamilton's law Hooke's law Law of Least Resistance Newton's 16th law of motion The force developed in a spring obeys Hooke's Law. The force developed in a spring obeys Hooke's Law. 14 / 16 When two gears of unequal size are meshed together, the smaller of the two is usually called a: rack pinion 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. 15 / 16 An inclined plane permits you to overcome a large: friction fulcrum resistance inertia An inclined plane permits you to overcome a large resistance. An inclined plane permits you to overcome a large resistance. 16 / 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. Your score is 0% Exit