Ch. 13 (Phy. Sci)

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 in a pool depends on

• 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 the 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 object's mass.

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

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

• the object's weight is greater than the buoyant force.

• the buoyant force is downward.

A submarine changes depth by altering its

• speed.

• density.

• total area.

• shape.