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 force friction mass Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 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 Pressure is the amount of force within a specific: area tube container fluid Pressure is the amount of force within a specific area. Pressure is the amount of force within a specific area. 4 / 16 In what type of system does mass remain constant and the net external force on the system is zero? balanced system elastic system closed sytem 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. 5 / 16 What can used to change rotary motion into linear motion? bevel worm drive miter cams Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. 6 / 16 The Law of Conservation of Momentum states: momentum of an open system remains the same total mass of a system remains the same total momentum of a closed system cannot change 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. 7 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: effort friction 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. 8 / 16 When two external gears mesh, they always turn in what directions? opposite lower upward 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. 9 / 16 Pressure that is less than normal air pressure is called a: leak puncture vacuum 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. 10 / 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. 11 / 16 What law does the force developed in a spring obey? Hamilton's law Newton's 16th law of motion Hooke's law Law of Least Resistance The force developed in a spring obeys Hooke's Law. The force developed in a spring obeys Hooke's Law. 12 / 16 What is the benefit of using ball bearings or roller bearings in a machine? metal is smoother than oil sliding friction is less than rolling friction greater mass equals more 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. 13 / 16 A metric system of units means that values can be calculated by factors of: one 10 mass infinity 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. 14 / 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. 15 / 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. 16 / 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 rotational work axle rotation 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. Your score is 0% Exit