Physics Fundamentals

What is the SI unit of force?

• Volt

• Watt

• Joule

• Newton (N)

Define Newton's first law of motion.

• An object will accelerate when no force is acting on it.

• An object will change direction when no force is applied to it.

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

• An object will stop moving when no force is present.

Explain the concept of inertia.

• Inertia is the ability of an object to move without any force applied.

• Inertia is the ability of an object to change its shape easily.

• Inertia is the tendency of an object to speed up when a force is applied.

• Inertia is the resistance of an object to changes in its state of motion.

What is the formula for calculating acceleration?

• acceleration = (final velocity - initial velocity) / time

• acceleration = (final velocity * initial velocity) / time

• acceleration = (final velocity + initial velocity) / time

• acceleration = final velocity / time

Describe the difference between mass and weight.

• Mass is the force exerted on an object, weight is the amount of matter in an object.

• Mass is measured in pounds, weight is measured in kilograms.

• Mass is the amount of matter in an object, weight is the force exerted on an object due to gravity.

• Mass is the weight of an object, weight is the size of an object.

What is the law of conservation of energy?

• Energy can be created and destroyed at will

• Energy is only conserved in closed systems

• Energy conservation only applies to mechanical energy

• Energy cannot be created or destroyed, only transferred or transformed from one form to another.

Define the term 'work' in physics.

• Work is the result of speed and time.

• Work is the sum of mass and acceleration.

• Work is the product of force and distance.

• Work is the outcome of energy and velocity.

Explain the concept of power.

• Power is the ability to generate electricity.

• Power is the speed at which something moves.

• Power is the amount of food consumed by an individual.

• Power is the ability to influence or control the behavior of others or the course of events.

What is the formula for calculating momentum?

• momentum = mass + velocity

• momentum = mass - velocity

• momentum = mass / velocity

• momentum = mass x velocity

Describe the difference between speed and velocity.

• Speed is scalar, velocity is vector.

• Speed is a measure of distance, velocity is a measure of time.

• Velocity is scalar, speed is vector.

• Speed and velocity are the same thing.