Mechanical Comprehension – Test 3 0% 62 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 What is the benefit of using ball bearings or roller bearings in a machine? sliding friction is less than rolling friction metal is smoother than oil rolling friction is less than sliding friction 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. 2 / 16 When two gears of unequal size are meshed together, the smaller of the two is usually called a: flywheel pinion shaft 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. 3 / 16 An inclined plane permits you to overcome a large: friction resistance inertia fulcrum An inclined plane permits you to overcome a large resistance. An inclined plane permits you to overcome a large resistance. 4 / 16 A metric system of units means that values can be calculated by factors of: mass 10 infinity one 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. 5 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: friction mass load effort 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 What can used to change rotary motion into linear motion? cams miter bevel worm drive Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 7 / 16 The Law of Conservation of Momentum states: total momentum of a closed system cannot change Momentum requires opposing forces momentum of an open system remains the same 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. 8 / 16 Third-class levers increase speed at the expense of: speed force mass friction Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 9 / 16 When two external gears mesh, they always turn in what directions? same upward lower opposite When two external gears mesh, they always turn in the opposite directions. When two external gears mesh, they always turn in the opposite directions. 10 / 16 Pressure that is less than normal air pressure is called a: leak depression puncture vacuum Pressure that is less than normal air pressure is called a vacuum. Pressure that is less than normal air pressure is called a vacuum. 11 / 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: flywheel shaft rack 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. 12 / 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. 13 / 16 In what type of system does mass remain constant and the net external force on the system is zero? elastic system frozen system closed sytem 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. 14 / 16 Pressure is the amount of force within a specific: tube fluid container area Pressure is the amount of force within a specific area. Pressure is the amount of force within a specific area. 15 / 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. 16 / 16 Equilibrium is achieved when the forces on a system are: inverse balanced net net hyperactive Equilibrium is achieved when the forces on a system are balanced. Equilibrium is achieved when the forces on a system are balanced. Your score is 0% Exit