Biology Flashcards
What is the definition of force?
Force is an interaction that causes an object to change its velocity, direction, or state of motion.
True or False: Pressure is defined as force per unit area.
True
Fill in the blank: The unit of force in the SI system is the ______.
Newton
What is the formula for calculating pressure?
Pressure = Force / Area
In which scenarios can pressure be considered a scalar quantity?
Pressure is a scalar quantity because it has magnitude but no direction.
What is atmospheric pressure at sea level approximately equal to?
101,325 Pascals
Multiple Choice: Which of the following is NOT a unit of pressure? A) Pascal B) Bar C) Joule D) Atmosphere
C) Joule
What happens to pressure when the area over which a force is applied decreases?
Pressure increases.
True or False: A larger force applied over a smaller area results in higher pressure.
True
Fill in the blank: The SI unit of pressure is the ______.
Pascal
What is the relationship between force, mass, and acceleration according to Newton’s second law?
Force = Mass × Acceleration
Multiple Choice: Which of the following describes the concept of buoyancy? A) The upward force exerted by a fluid B) The force of gravity C) The resistance of a solid D) The pressure exerted by a gas
A) The upward force exerted by a fluid
What is the difference between static pressure and dynamic pressure?
Static pressure is the pressure exerted by a fluid at rest, while dynamic pressure is the pressure due to the fluid’s motion.
Fill in the blank: The pressure exerted by a liquid in a container increases with ______.
depth
True or False: An object submerged in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced.
True
What is the principle that explains why airplanes can fly?
Bernoulli’s principle, which states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.
Multiple Choice: Which of the following is an example of a non-contact force? A) Friction B) Gravitational force C) Tension D) Normal force
B) Gravitational force
What is the term for the force that resists the motion of two surfaces sliding against each other?
Friction
Fill in the blank: The force that acts on an object in the opposite direction to its motion is called ______.
drag
True or False: A pressure cooker works by increasing the pressure inside the pot to raise the boiling point of water.
True
What is the effect of increasing temperature on gas pressure in a closed container?
Increasing temperature increases gas pressure.
Multiple Choice: Which law states that pressure and volume of a gas are inversely related at constant temperature? A) Charles’s Law B) Boyle’s Law C) Avogadro’s Law D) Dalton’s Law
B) Boyle’s Law
What is the term for the force per unit length acting along a line?
Lineic force
Fill in the blank: The pressure at a given depth in a fluid is given by the formula ______.
Pressure = Density × Gravity × Depth
