What is the definition of force?

• Force is an interaction that causes an object to change its motion.

• Force is a type of mass that resists motion.

• Force is the amount of energy in an object.

• Force is the speed at which an object moves.

What is Newton's first law of motion?

• An object will remain at rest or in uniform motion unless acted upon by an external force.

• An object will accelerate indefinitely without any force.

• An object will change direction only when a force is applied.

• An object will only move if a force is applied continuously.

How does mass affect the acceleration of an object?

• Acceleration is independent of mass.

• Mass affects acceleration inversely; greater mass results in lower acceleration for a given force.

• Greater mass always increases acceleration.

• Mass has no effect on acceleration.

What is the formula for calculating force?

• F = m * a

• F = m + a

• F = m / a

• F = m - a

What is the difference between speed and velocity?

• Speed is a vector; velocity is scalar.

• Speed is scalar; velocity is vector (includes direction).

• Speed measures distance; velocity measures time.

• Speed is always constant; velocity can change.

What is inertia?

• Inertia is the force that causes an object to move.

• Inertia is the resistance of an object to changes in its motion.

• Inertia is the speed of an object in motion.

• Inertia is the energy stored in an object at rest.

How do balanced and unbalanced forces affect motion?

• Balanced forces cause acceleration in all cases.

• Balanced forces maintain motion, while unbalanced forces change motion.

• Balanced forces always stop motion.

• Unbalanced forces have no effect on motion.

What is the role of friction in motion?

• Friction enables and controls motion by providing the necessary grip between surfaces.

• Friction reduces motion by creating a barrier between surfaces.

• Friction only occurs in liquids and has no role in solid surfaces.

• Friction has no effect on motion and is irrelevant in physics.

What is gravitational force?

• Gravitational force is the energy produced by a mass.

• Gravitational force is the attraction between two masses.

• Gravitational force is the force that keeps objects in motion.

• Gravitational force is the repulsion between two masses.

How does air resistance affect falling objects?

• Air resistance increases the speed of falling objects.

• Air resistance has no effect on falling objects.

• Air resistance slows down falling objects and leads to a terminal velocity.

• Air resistance only affects objects that are not falling vertically.