Force and Pressure Quiz

The unit of force is the ...

The unit for measuring pressure is the ...

How are the concepts of force and pressure related?

A man pokes his dog with the end of a thick stick to wake it up.

It doesn't wake, so he gets a thinner stick and pokes with the same amount of force. This time the dog jumps up and yelps.

Explain why the second poke caused more pain than the first, even though the applied force was the same.

A scuba diver dives down to 30m below the surface of the ocean to find a seahorse.

What is the pressure on the man due to the water only?

The density of water is 1,000kg per cubic metre.

Acceleration due to gravity, g = 9.8 metres per second squared.ms+

Two four-legged coffee tables are carrying equal-weight tea trays. Table A has legs with surface area on the ground twice that of Table B's legs.

Which of the following is correct?

• Table A's legs exert double the force that Table B's legs exert on the floor.

• Table B has twice as many legs as Table A.

• Table A's legs exert half the pressure that Table B's legs exert on the floor.

• Table A's legs exert the same pressure on the ground as Table B's legs exert on the ground.

Atmospheric pressure varies depending on your height above sea level.

Describe how the pressure varies as your height above sea level increases.

Explain why the atmospheric pressure varies with height in the way you described in the previous question.