Mechanical Comprehension – Test 3 0% 62 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: effort load friction 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. 2 / 16 A metric system of units means that values can be calculated by factors of: 10 one 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. 3 / 16 When two external gears mesh, they always turn in what directions? upward same opposite 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. 4 / 16 What can used to change rotary motion into linear motion? worm drive bevel cams miter Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 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 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. 6 / 16 Third-class levers increase speed at the expense of: friction force mass speed Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 7 / 16 In what type of system does mass remain constant and the net external force on the system is zero? balanced system closed sytem frozen system 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. 8 / 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. 9 / 16 The Law of Conservation of Momentum states: total mass of a system remains the same momentum of an open system remains the same Momentum requires opposing forces 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. The Law of Conservation of Momentum states that the total momentum of a closed system cannot change. 10 / 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. 11 / 16 Pressure that is less than normal air pressure is called a: leak depression vacuum puncture Pressure that is less than normal air pressure is called a vacuum. Pressure that is less than normal air pressure is called a vacuum. 12 / 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 torque 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. 13 / 16 When two gears of unequal size are meshed together, the smaller of the two is usually called a: shaft pinion 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. 14 / 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. 15 / 16 What law does the force developed in a spring obey? Hooke's law Hamilton's law Newton's 16th law of motion Law of Least Resistance The force developed in a spring obeys Hooke's Law. The force developed in a spring obeys Hooke's Law. 16 / 16 An inclined plane permits you to overcome a large: resistance friction fulcrum inertia 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