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 mass friction force Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 2 / 16 What law does the force developed in a spring obey? Hamilton's law Law of Least Resistance 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. 3 / 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. 4 / 16 In what type of system does mass remain constant and the net external force on the system is zero? frozen system closed sytem balanced system elastic 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. 5 / 16 Pressure that is less than normal air pressure is called a: leak depression 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. 6 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: friction effort mass 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. 7 / 16 Equilibrium is achieved when the forces on a system are: net net balanced hyperactive inverse Equilibrium is achieved when the forces on a system are balanced. Equilibrium is achieved when the forces on a system are balanced. 8 / 16 The Law of Conservation of Momentum states: total mass of a system remains the same Momentum requires opposing forces 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. 9 / 16 What can used to change rotary motion into linear motion? bevel miter worm drive cams Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 10 / 16 When two external gears mesh, they always turn in what directions? opposite upward same 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 What is the benefit of using ball bearings or roller bearings in a machine? metal is smoother than oil greater mass equals more friction rolling friction is less than sliding friction sliding friction is less than rolling 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. 13 / 16 When two gears of unequal size are meshed together, the smaller of the two is usually called a: flywheel shaft pinion 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. 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 flywheel pinion 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. 15 / 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. 16 / 16 A metric system of units means that values can be calculated by factors of: one infinity 10 mass 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