Mechanical Comprehension – Test 3 0% 62 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 In what type of system does mass remain constant and the net external force on the system is zero? balanced system frozen system elastic 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. 2 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: friction mass effort 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. 3 / 16 What law does the force developed in a spring obey? Law of Least Resistance Hamilton's law Hooke's law 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. 4 / 16 An inclined plane permits you to overcome a large: friction inertia fulcrum resistance An inclined plane permits you to overcome a large resistance. An inclined plane permits you to overcome a large resistance. 5 / 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. 6 / 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. 7 / 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 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. 8 / 16 What is the benefit of using ball bearings or roller bearings in a machine? rolling friction is less than sliding friction metal is smoother than oil sliding friction is less than rolling 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. 9 / 16 A metric system of units means that values can be calculated by factors of: infinity one mass 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. 10 / 16 Third-class levers increase speed at the expense of: mass friction speed force Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 11 / 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. 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: mass work torque axle rotation 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 Equilibrium is achieved when the forces on a system are: hyperactive balanced net net inverse Equilibrium is achieved when the forces on a system are balanced. Equilibrium is achieved when the forces on a system are balanced. 14 / 16 The Law of Conservation of Momentum states: Momentum requires opposing forces total mass of a system remains the same momentum of an open system remains the same 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. 15 / 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. 16 / 16 What can used to change rotary motion into linear motion? miter cams bevel worm drive Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. Your score is 0% Exit