Ch.13 Physical Science- Forces in Fluids

A resting object exerts pressure equal to

• its mass times its contact area

• its weight times its contact area

• its mass divided by its contact area

• its weight divided by its contact area

Compared to the pressure exerted by a brick standing on its end, the pressure exerted by a brick resting on its side is

• the same

• less

• more

• twice as much

the amount of water pressure you experience while swimming on its end, the pressure exerted by a brick resting on its side is

• your buoyancy

• the area of the pool

• the volume of water in the pool

• how deep you are in the water

which of the following is NOT true about SI unit of pressure?

• It is used for fluids only

• it is called a Pascal

• it is equal to one newton per square meter

• it represents force per unit area

blaise pascal discovered that changes in pressure

• are transmitted equally throughout a fluid

• increase with depth of fluid

• decrease with depth of fluid

• depend on area

in a hydraulic lift system, the output force is greater than the input force because

• a larger pressure acts on the output piston

• a larger pressure acts on the input piston

• the fluid pressure acts on areas of different sizes

• of Bernoulli's principle

which of the following is NOT true about Bernoulli's principle?

• the pressure within a moving fluid is greater than the pressure within a nonmoving fluid

• as a fluid's speed increases, the pressure within it decreases

• when a moving fluid slows, the pressure within it increases

• it helps explain the lift of an airplane

the buoyant force acting on a submerged object is equal to

• the objects mass

• the objects volume

• the mass of the fluid displaced by the object

• the weight of the fluid displaced by the object

a partially submerged object floats when

• the objects weight is equal to the buoyant force.

• the object's mass is equal to the buoyant force.

• the objects weight is greater than the buoyant force

• the buoyant force is downward

a submarine changes depth by altering its

• speed

• density

• total area

• shape