2025 Q3 Exam: Forces, Kepler, Laws, work/Power, Momentum

Front

What is Momentum?

Back

Momentum is a measure of motion defined as the mass times the velocity of an object. It is a vector quantity, meaning it has both magnitude and direction.

Front

What is the formula for calculating Power?

Back

Power is calculated using the formula: Power = Work / Time. It measures the rate at which work is done.

Front

What is Impulse?

Back

Impulse is the force applied to an object multiplied by the amount of time the force is applied. It is equal to the change in momentum of the object.

Front

What is the relationship between velocity and momentum?

Back

No velocity produces no momentum regardless of the mass. If an object is at rest (velocity = 0), its momentum is also zero.

Front

What is the gravitational force between two objects?

Back

The gravitational force can be calculated using Newton's law of universal gravitation: F = G * (m1 * m2) / r^2, where G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between their centers.

Front

What is an Elastic Collision?

Back

An elastic collision is a collision in which both momentum and kinetic energy are conserved. Objects bounce off each other without losing energy.

Front

What is an Inelastic Collision?

Back

An inelastic collision is a collision in which momentum is conserved, but kinetic energy is not. The objects may stick together after the collision.

Front

How do you calculate Work?

Back

Work is calculated using the formula: Work = Force x Distance x cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the unit of Power?

Back

The unit of Power is the Watt (W), which is equivalent to one Joule per second (J/s).

Front

What is the principle of conservation of momentum?

Back

The principle of conservation of momentum states that in a closed system, the total momentum before an event (like a collision) is equal to the total momentum after the event.