Physics Spring Semester Review

Front

What happens to the electrical force between two charged particles when the distance between them triples?

Back

The electrical force decreases by a factor of 9.

Front

What does the normal force represent in a free-body diagram?

Back

The normal force is the force exerted by a surface to support the weight of an object resting on it, acting perpendicular to the surface.

Front

Why does a balloon stick to a wall after being rubbed on a wool sweater?

Back

The friction of the balloon on the wool sweater pulls a negative charge off of the wool sweater and onto the balloon.

Front

What is the electromagnetic force?

Back

The electromagnetic force is the force that causes opposite charges to attract each other.

Front

What phenomenon is utilized in digital cameras?

Back

The photoelectric effect.

Front

What is Coulomb's Law?

Back

Coulomb's Law states that the electrical force between two charged objects is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them.

Front

What is the principle of superposition in physics?

Back

The principle of superposition states that the total force acting on a particle is the vector sum of all individual forces acting on it.

Front

What is the definition of a vector?

Back

A vector is a quantity that has both magnitude and direction.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is Newton's First Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a net external force.