Mechanical Comprehension – Test 3 0% 61 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 Equilibrium is achieved when the forces on a system are: hyperactive inverse 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. 2 / 16 What can used to change rotary motion into linear motion? worm drive miter cams bevel Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 3 / 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 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. 4 / 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 metal is smoother than oil rolling friction is 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. The benefit of using ball bearings or roller bearings in a machine is that rolling friction is always less than sliding friction. 5 / 16 A metric system of units means that values can be calculated by factors of: 10 mass 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. 6 / 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. 7 / 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. 8 / 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. 9 / 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. 10 / 16 When two external gears mesh, they always turn in what directions? same opposite upward 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. 11 / 16 Pressure is the amount of force within a specific: container area tube fluid Pressure is the amount of force within a specific area. Pressure is the amount of force within a specific area. 12 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: mass load friction 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. 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 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. 14 / 16 An inclined plane permits you to overcome a large: friction inertia resistance fulcrum An inclined plane permits you to overcome a large resistance. An inclined plane permits you to overcome a large resistance. 15 / 16 The Law of Conservation of Momentum states: Momentum requires opposing forces momentum of an open system remains the same total momentum of a closed system cannot change 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. 16 / 16 In what type of system does mass remain constant and the net external force on the system is zero? closed sytem balanced system elastic system frozen 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. Your score is 0% Exit