REVIEW: Forces, Mass vs. Weight

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, measured in kilograms (kg), and remains constant regardless of location. Weight is the force exerted by gravity on that mass, measured in newtons (N), and can change depending on the gravitational pull.

Front

What are non-contact forces?

Back

Non-contact forces are forces that act on an object without physical contact. Examples include gravitational force and magnetic force.

Front

What is gravitational force?

Back

Gravitational force is the attraction between two masses. It is a non-contact force that pulls objects toward each other, such as the Earth pulling objects toward its center.

Front

What is magnetic force?

Back

Magnetic force is the attraction or repulsion between magnetic poles. It is a non-contact force that can act at a distance.

Front

What is a contact force?

Back

A contact force is a force that acts on an object through direct physical contact. Examples include friction, tension, and normal force.

Front

What happens to an object's weight when it is taken to the moon?

Back

An object's weight decreases on the moon because the gravitational pull is weaker than on Earth, but its mass remains unchanged.

Front

How does distance affect gravitational force?

Back

Gravitational force decreases as the distance between two objects increases. The further apart they are, the weaker the gravitational attraction.

Front

What is the formula for calculating weight?

Back

Weight (W) = mass (m) × gravitational acceleration (g). On Earth, g is approximately 9.81 m/s².

Front

What is the role of friction as a contact force?

Back

Friction is a contact force that opposes the motion of an object. It acts between surfaces in contact and can cause objects to slow down or stop.

Front

What is the significance of mass in physics?

Back

Mass is a measure of an object's resistance to acceleration when a force is applied. It is a fundamental property that affects how objects interact with forces.