Mechanical Principles

What is the radius of the hole in the shown picture

• 12

• 75

• 15

• 45

What would happen to the coiled wire in an electric motor model if there are repulsion and attraction of the magnetic poles?

• The coil fluctuates and converts electrical energy into chemical energy.

• The coil stops and changes mechanical energy into electrical energy.

• The coil rotates and changes electrical energy into mechanical energy.

• The coil remains unstable.

Tags

NGSS.MS-PS3-5

What is the principle behind the operation of a lever?

• The principle of conservation of energy

• The principle of moments

• The principle of inertia

• The principle of acceleration

Which of the following is an example of a first-class lever?

• Scissors

• Wheelbarrow

• Nutcracker

• Tweezers

What is the mechanical advantage of a machine that requires an input force of 10 N to lift a 50 N load?

• 5

• 0.2

• 50

• 10

Tags

NGSS.MS-PS2-2

In a pulley system, if the load is 100 kg and the effort is 25 kg, what is the mechanical advantage?

• 4

• 0.25

• 100

• 25

Tags

NGSS.MS-PS2-2

Which law explains the relationship between the force applied to a spring and its extension?

• Newton's First Law

• Hooke's Law

• Pascal's Law

• Archimedes' Principle

What is the unit of mechanical advantage?

• Newton

• Joule

• No unit

• Watt

Which of the following is a real-world application of mechanical advantage?

• Using a ramp to load goods onto a truck

• Boiling water to produce steam

• Mixing chemicals in a lab

• Measuring temperature with a thermometer

What happens to the efficiency of a machine if friction is reduced?

• Efficiency increases

• Efficiency decreases

• Efficiency remains the same

• Efficiency becomes zero