Physical Quantities and Units Quiz

Physical Quantities and Units

• Distance (d): Measured in meters (m) or kilometers (km). Scalar quantity.
• Time (t): Measured in seconds (s), minutes (min), or hours (hrs). Scalar quantity.
• Speed (s): Measured in meters per second (m/s) or kilometers per hour (km/hr). Scalar quantity.
• Velocity (v): Measured in meters per second (m/s) or kilometers per hour (km/hr). Vector quantity.
• Acceleration (a): Measured in meters per second squared (m/s²). Vector quantity.
• Force (F): Measured in Newtons (N), equivalent to kg·m/s². Vector quantity.
• Weight (W): Measured in Newtons (N). Vector quantity, equal to mass (m) multiplied by the acceleration due to gravity (g = 9.8 m/s²). (W = mg)
• Mass (m): Measured in kilograms (kg). Scalar quantity.
• Momentum (p): Measured in kilograms meters per second (kg·m/s). Vector quantity.
• Centripetal Force (Fc): Measured in Newtons (N). Vector quantity.
• Frictional Force (Ff): Measured in Newtons (N). Vector quantity.

Definitions

• Motion: A change in position relative to a reference point.
• Reference Point: A place or object used for comparison to determine motion.
• International System of Units (SI): The system of measurement used by scientists.
• Distance: The length of the path between two points.
• Speed: The distance an object moves per unit of time.
• Average Speed: Total distance traveled divided by the total time taken.
• Instantaneous Speed: Speed at a specific moment in time.
• Velocity: Speed in a given direction.
• Slope: The steepness of a line.
• Acceleration: Rate of change in velocity.
• Force: A push or pull.
• Net Force: The overall force resulting from all forces acting on an object.
• Friction: The force that opposes motion between surfaces in contact.
• Sliding Friction: Friction between surfaces sliding over each other.
• Static Friction: Friction between surfaces that are not moving.
• Fluid Friction: Friction when an object moves through a fluid.
• Rolling Friction: Friction when an object rolls across a surface.
• Gravity: The force that pulls objects towards each other.
• Mass: The amount of matter in an object.
• Weight: The force of gravity acting on an object.
• Inertia: Resistance to a change in motion.
• Momentum: A measure of an object's motion, related to its mass and velocity.
• Free Fall: When gravity is the only force acting on an object.
• Satellite: An object orbiting another object in space, following a curved path.
• Centripetal Force: A force that causes circular motion.

Newton's Laws of Motion

• Newton's First Law: An object at rest stays at rest, and an object in motion stays in motion at constant velocity, unless acted upon by a net force. This is inertia. Inertia depends on an object's mass; higher mass means higher inertia.
• Newton's Second Law: Force equals mass times acceleration (F=ma). This means acceleration is directly proportional to the force and inversely proportional to the mass.
• Newton's Third Law: For every action, there is an equal and opposite reaction. Action-reaction pairs act on different objects.

Test your knowledge on physical quantities and their units with this quiz. Explore concepts such as distance, speed, acceleration, and force. Ideal for students looking to reinforce their understanding of physics fundamentals.