Exploring the World of Physics

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 if no force is applied.

• An object will remain in motion indefinitely without any forces acting on it.

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

Define kinetic energy and provide its formula.

• KE = m * v

• KE = 0.5 * m * v

• KE = m * v^2 / 2

• The formula for kinetic energy is KE = 0.5 * m * v^2, where KE is kinetic energy, m is mass, and v is velocity.

What is the principle of conservation of energy?

• Energy can be created and destroyed.

• Energy is only lost in transformations.

• Energy cannot be created or destroyed, only transformed.

• Energy can be generated from nothing.

Explain the difference between speed and velocity.

• Speed can be negative, while velocity cannot.

• Speed is always greater than velocity.

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

• Velocity measures distance only, not direction.

What is the formula for calculating gravitational force?

• F = m1 * m2 / r

• F = G * m1 * m2 * r

• F = G * (m1 * m2) / r^2

• F = G * (m1 + m2) / r^2

Describe the concept of momentum and its formula.

• p = m / v

• p = m + v

• p = v / m

• The formula for momentum (p) is p = m * v, where p is momentum, m is mass, and v is velocity.

What is the significance of the speed of light in physics?

• The speed of light is significant as it is the maximum speed for information and matter, fundamental to the theory of relativity and electromagnetic theory.

• The speed of light is irrelevant to quantum mechanics.

• The speed of light is only important in astronomy.

• The speed of light can be exceeded by sound waves.

Explain the difference between scalar and vector quantities.

• Scalar quantities are always larger than vector quantities.

• Scalar quantities have only magnitude; vector quantities have both magnitude and direction.

• Scalar quantities have direction; vector quantities have only magnitude.

• Scalar quantities can be negative; vector quantities cannot.

What is Ohm's Law and its mathematical expression?

• Ohm's Law: V = I * R

• V = R / I

• I = V + R

• R = V - I

What are the three laws of thermodynamics?

• First Law: Energy can be created;

• 1. First Law: Energy conservation; 2. Second Law: Entropy increase; 3. Third Law: Entropy at absolute zero

• Second Law: Energy is always conserved;

• Third Law: Entropy decreases with temperature increase