Benchmark #2 Study Guide

Front

What is a graph that represents motion?

Back

A graph that represents motion typically shows the relationship between distance and time, illustrating how far an object has traveled over a specific period.

Front

What is an electric motor?

Back

An electric motor is a device that converts electrical energy into mechanical energy through the interaction of magnetic fields.

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current, usually consisting of a coil of wire wrapped around a ferromagnetic core.

Front

What is a dependent variable in an experiment?

Back

The dependent variable is the variable that is measured or observed in an experiment, which is affected by changes in the independent variable.

Front

What causes tides on Earth?

Back

Tides on Earth are caused by the gravitational forces exerted by the Moon and the Sun on Earth's oceans.

Front

What is a light year?

Back

A light year is the distance that light travels in one year, approximately 5.88 trillion miles (9.46 trillion kilometers).

Front

What happens to the distance of galaxies as the universe expands?

Back

As the universe expands, the distance between galaxies generally increases.

Front

What is the role of magnetic fields in electric motors?

Back

Magnetic fields in electric motors create forces that cause the motor's coil to rotate, enabling mechanical movement.

Front

What is the significance of the number of coils in an electromagnet?

Back

The number of coils in an electromagnet affects its strength; more coils generally result in a stronger magnetic field.

Front

What is the relationship between force and motion in electric motors?

Back

In electric motors, the force generated by magnetic fields causes the motion of the coil, which is essential for the motor's operation.