Flashcards on Forces, Pressure, and Diffusion
Forces, Pressure, & Diffusion: Explained for Students
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Forces and Pressure (Physics)
23 cards
Card 1
Question: What can forces do to the motion of an object?
Answer: They can make objects speed up, slow down or change direction.
Card 2
Question: Give an example of a force that makes an object speed up when dropped.
Answer: The force of gravity makes a stone speed up when you drop it.
Card 3
Question: What two types of friction slow objects down?
Answer: Friction between solid surfaces and air resistance (friction with the air).
Card 4
Question: What is air resistance and give one use of it?
Answer: Air resistance is the frictional force that slows objects moving through air; parachutes use air resistance to slow descent.
Card 5
Question: When more than one force acts on an object, how do you find their combined effect?
Answer: You add the forces to make a single force called the resultant force.
Card 6
Question: What does it mean for forces to be unbalanced?
Answer: There is more force in one direction than the other, so there is a nonzero resultant force.
Card 7
Question: What are balanced forces?
Answer: When total force in one direction equals total force in the opposite direction, the resultant force is zero and forces are balanced.
Card 8
Question: What is upthrust?
Answer: Upthrust is the upward force water (or a fluid) exerts on an object placed in it; objects also experience upthrust in the air.
Card 9
Question: Describe what happens to a helium balloon when a load attached to it is cut away.
Answer: After the load is detached the resultant force is upwards, so the balloon starts to move up until another force (like a normal force from the ceiling)
Card 10
Question: What is the normal force?
Answer: The normal force is the force exerted by a surface to support the weight of an object resting on it; it acts perpendicular to the surface.