Reg Physics Unit 2 Test

Front

What is Newton's First Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a net external force.

Front

Define kinetic energy.

Back

Kinetic energy is the energy that an object possesses due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

What is the principle of conservation of energy?

Back

The total energy in a closed system remains constant; energy can neither be created nor destroyed, only transformed from one form to another.

Front

Explain the concept of momentum.

Back

Momentum is the product of an object's mass and its velocity, represented as p = mv. It is a vector quantity, having both magnitude and direction.

Front

What is the formula for gravitational potential energy?

Back

Gravitational potential energy (PE) is given by the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

Define work in physics.

Back

Work is done when a force causes an object to move, calculated as W = Fd cos(θ), where F is the force, d is the distance moved, and θ is the angle between the force and the direction of motion.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

Front

State the law of universal gravitation.

Back

Every point mass attracts every other point mass in the universe with a force that is directly 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 calculating acceleration?

Back

Acceleration (a) is calculated using the formula a = (vf - vi) / t, where vf is the final velocity, vi is the initial velocity, and t is the time taken.

Front

Define friction and its types.

Back

Friction is the resistance that one surface or object encounters when moving over another. The main types are static friction, kinetic friction, and rolling friction.