Exploring the World of Physics

What is the formula for calculating force?

• F = m - a

• F = m / a

• F = m * a

• F = m + a

Define Newton's First Law of Motion.

• An object will remain in motion only if it is in a vacuum.

• An object will accelerate unless a force is applied.

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

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

What is the unit of energy in the International System of Units?

• watt

• calorie

• volt

• joule

Explain the concept of kinetic energy.

• Kinetic energy is calculated as KE = mv².

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

• Kinetic energy is the energy of an object when it is at its highest point.

• Kinetic energy is the energy of an object in motion, calculated as KE = 1/2 mv².

What is the difference between speed and velocity?

• Speed is a vector; velocity is scalar.

• Speed measures distance; velocity measures time.

• Speed is always constant; velocity can change.

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

State the law of conservation of energy.

• Energy cannot be created or destroyed, only transformed.

• Energy is always lost in transformations.

• Energy can be created and destroyed.

• Energy can only be created from matter.

What is the acceleration due to gravity on Earth?

• 9.00 m/s²

• 10.5 m/s²

• 8.9 m/s²

• 9.81 m/s²

Describe what a wave is in physics.

• A wave is a type of particle that cannot transfer energy.

• A wave is a disturbance that transfers energy through space or matter.

• A wave is a solid object that does not move.

• A wave is a fixed position in space that does not change.

What is the principle of buoyancy?

• Buoyancy is the force that pulls objects down in a fluid.

• An object submerged in a fluid experiences an upward force equal to the weight of the fluid displaced.

• An object in a fluid will float if it is heavier than the fluid.

• An object submerged in a fluid experiences a downward force equal to the weight of the fluid displaced.

How does friction affect motion?

• Friction only affects stationary objects.

• Friction increases the speed of moving objects.

• Friction opposes motion and can slow down or stop moving objects.

• Friction has no effect on motion.