Mechanical Comprehension – Test 3 0% 62 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 Pressure that is less than normal air pressure is called a: depression leak 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. 2 / 16 In what type of system does mass remain constant and the net external force on the system is zero? closed sytem frozen system elastic system 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. 3 / 16 Equilibrium is achieved when the forces on a system are: net net inverse balanced hyperactive Equilibrium is achieved when the forces on a system are balanced. Equilibrium is achieved when the forces on a system are balanced. 4 / 16 An inclined plane permits you to overcome a large: inertia friction fulcrum resistance An inclined plane permits you to overcome a large resistance. An inclined plane permits you to overcome a large resistance. 5 / 16 Third-class levers increase speed at the expense of: speed mass force friction Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 6 / 16 When two external gears mesh, they always turn in what directions? lower opposite same upward When two external gears mesh, they always turn in the opposite directions. When two external gears mesh, they always turn in the opposite directions. 7 / 16 Pressure is the amount of force within a specific: tube area fluid container Pressure is the amount of force within a specific area. Pressure is the amount of force within a specific area. 8 / 16 What can used to change rotary motion into linear motion? cams bevel worm drive miter Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 9 / 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 torque mass work 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. 10 / 16 What law does the force developed in a spring obey? Hamilton's law Law of Least Resistance 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. 11 / 16 What is the benefit of using ball bearings or roller bearings in a machine? metal is smoother than oil greater mass equals more friction sliding friction is less than rolling friction 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. 12 / 16 When two gears of unequal size are meshed together, the smaller of the two is usually called a: flywheel rack shaft 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. 13 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: mass effort load 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. 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 shaft 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. 15 / 16 The Law of Conservation of Momentum states: momentum of an open system remains the same total momentum of a closed system cannot change total mass of a 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. 16 / 16 A metric system of units means that values can be calculated by factors of: infinity mass 10 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. Your score is 0% Exit