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Which of these is an example of a non-contact force?

Gravitational force.

Friction.

Normal force.

Tension.

What is the key difference between mass and weight in terms of force?

Mass changes with location, but weight remains constant.

Mass is a force that acts on an object, whereas weight is the amount of matter in an object.

Mass and weight are always equal.

Mass is constant, while weight is the force due to gravity.

Which of the following is true about contact forces?

They act without the need for physical contact between objects.

They include gravitational and magnetic forces.

They never cause motion.

They can only be applied when objects are in contact with each other.

What is the role of the normal force when an object is resting on a horizontal surface?

It provides tension in the object.

It opposes the motion of the object.

It supports the object against gravity, preventing it from falling through the surface.

It accelerates the object horizontally.

What is the unit of mass?

Kilogram (kg).

Joule (J).

Newton (N).

Meter (m).