Force and Pressure

A woman has 4 type of shoes. Which will exert the greatest pressure on the ground when she wears them?

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Diagram below shows a water reservoir. The base of the wall is thicker because

• it will be more stable

• the density of the water is high

• pressure of the water is highest at the surface

• Pressure of the water is highest at the base

Diagram below shows a mercury column in a capillary tube. There is air trapped in the upper part of the tube. What is the air pressure in the tube? [Atmospheric Pressure = 76 cm Hg]

• 30 cm Hg

• 46 cm Hg

• 76 cm Hg

• 106 cm Hg

Why is the atmospheric pressure at a higher altitude lower?

• Temperature is high

• Density of air is high

• The layer of air is thin

• The volume of air does not change

Diagram below shows an apple is floating in a beaker of water. Which of the following statement describes the buoyant force correctly?

• The buoyant force equals to the mass of the water displaced

• The buoyant force equals to the weight of the apple

• The buoyant force equals to the volume of the water displaced

• The buoyant force equals to the mass of the apple

Diagram shows water spurting out from a flask when a force is exerted on the piston. Why does the water spurt out uniformly in all direction？

• Force is exerted uniformly

• Surface area of piston is small

• Pressure is transmitted uniformly

• The holes on the surface of the flask are small

Diagram below shows a hydraulic jack in equilibrium. Calculate the value of F.

• 10 N

• 20 N

• 30 N

• 40 N

Diagram below shows water flowing in through P and flowing out from Q. This will affect the level of water in each tube. Which of these tubes will experience the highest pressure?

• Tube 1

• Tube 2

• Tube 3

• Tube 4

Diagram shows the fast flowing water in the filter funnel. As a result, the ping pong ball sucked up. Which of the following statements is correct?

• The ping pong ball is sucked to the funnel by the water.

• The upthrust from air is less than the weigh of the ping pong ball

• The flowing water has caused an apparent loss in weight of the ping pong ball

• There is a resultant force acting upwards to support the weigh of the ping pong ball

Diagram shows the random motion of the gas molecules inside a container. The pressure of the gas will NOT increase if

• The number of molecules in the container is increased

• The mass of the molecules is increased

• The speed of the molecules is increased

• The volume of the container is increased