Forces & Motion

Front

What is inertia?

Back

Inertia is the property of an object to resist changes in its state of motion. It means that an object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by a net external force.

Front

Who proposed the law of universal gravitation?

Back

Isaac Newton proposed the law of universal gravitation, which states that every mass attracts every other mass in the universe with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Front

What is the formula for net force (F_net)?

Back

The formula for net force is F_net = F_a - F_f, where F_a is the applied force and F_f is the frictional force.

Front

What must be true for an object moving at constant velocity in the presence of friction?

Back

The frictional force must equal the force applied by the object to maintain constant velocity.

Front

What does it mean when an object is at terminal velocity?

Back

When an object is at terminal velocity, it experiences a net force of 0, meaning the forces acting on it are balanced, resulting in no acceleration.

Front

Define force.

Back

A force is a push or pull acting upon an object, resulting from its interaction with another object. It is a vector quantity, having both magnitude and direction.

Front

What is Newton's First Law of Motion?

Back

Newton's First Law states that an object at rest will remain at rest, and an object in motion will continue in motion with the same speed and in the same direction unless acted upon by a net external force.

Front

What is the relationship between mass and weight?

Back

Weight is the force exerted by gravity on an object, calculated as weight = mass × gravitational acceleration (W = mg). Mass is a measure of the amount of matter in an object.

Front

What is friction?

Back

Friction is the force that opposes the relative motion of two surfaces in contact. It acts parallel to the surfaces and can be static (preventing motion) or kinetic (resisting motion).

Front

What is acceleration?

Back

Acceleration is the rate of change of velocity of an object with respect to time. It is a vector quantity and can be caused by a change in speed or direction.