p5

Question 1

air resistance

Answer 1

forces that are in opposition relative to the motion of the object throughout air

Question 2

fluid

Answer 2

anything that flows

Question 3

inverse

Answer 3

flip it

Question 4

pressure

Answer 4

force/area

Question 5

terminal velocity

Answer 5

speed at which the force of air resistance equals the force of the objects weight

Question 6

pascal

Answer 6

unit for pressure

Question 7

What causes acceleration? -

Answer 7

force

Question 8

What is Newton’s 2nd Law? -

Answer 8

The acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force and is inversely proportional to the mass of the object.

Question 9

Which exerts more pressure a person lying down on their back or the same person standing? Why?

Answer 9

A person standing, because there is more force focused on a smaller area

Question 10

An object presses down with a force of 1,000 N and on an area of .5 m^2. What pressure is it exerting? (label)

Answer 10

2,000 pascals

Question 11

Describe what is happening when an object reaches terminal velocity. Mention the two forces acting on the object in your description.

Answer 11

Terminal velocity is the speed when the force of air resistance equals the force of the object’s weight, so an object is no longer accelerating; gravity and air resistance that act on the object have equalled out (equilibrium).

Question 12

What has a greater air resistance, a flat piece of paper falling horizontally or a crumpled piece of paper?

Answer 12

A flat piece of paper falling horizontally, because it has more surface area, which is directly proportional to air resistance.

Question 13

Calculate the acceleration of a 2,500 kg airplane when its engines are producing 2,000 N of thrust.

Answer 13

(2,000 / 2,500) = 0.8 m/s/s