Mechanical Comprehension – Test 3 0% 62 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 Third-class levers increase speed at the expense of: speed friction mass force Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 2 / 16 A metric system of units means that values can be calculated by factors of: mass one 10 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 Pressure is the amount of force within a specific: container area fluid tube Pressure is the amount of force within a specific area. Pressure is the amount of force within a specific area. 4 / 16 When two gears of unequal size are meshed together, the smaller of the two is usually called a: pinion flywheel rack 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. 5 / 16 What can used to change rotary motion into linear motion? miter cams worm drive bevel Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 6 / 16 Equilibrium is achieved when the forces on a system are: hyperactive inverse net net balanced 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 external gears mesh, they always turn in what directions? opposite lower upward 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. 8 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: load effort 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. 9 / 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. 10 / 16 The Law of Conservation of Momentum states: total momentum of a closed system cannot change total mass of a system remains the same momentum of an open 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 that is less than normal air pressure is called a: vacuum puncture 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. 12 / 16 What is the benefit of using ball bearings or roller bearings in a machine? sliding friction is less than rolling friction greater mass equals more friction rolling friction is less than sliding 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 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 rotational work 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. 14 / 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. 15 / 16 In what type of system does mass remain constant and the net external force on the system is zero? elastic system frozen 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. 16 / 16 An inclined plane permits you to overcome a large: inertia fulcrum resistance friction 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