1
Which of the following situations presents a case of opposing forces?
a) Sami pushes his bedside table by himself to move it.
b) Sami and Harriet push his bedside table together to move it.
c) Sami pushes his bedside table to move it, and Harriet blocks it by putting her foot in front of one of the table legs
c) Sami pushes his bedside table to move it, and Harriet blocks it by putting her foot in front of one of the table legs
When an airplane is in flight, which force opposes the drag on it? Check the correct answer.
a) Lift
b) Thrust
c) Weight
b) Thrust
Match the forces of an airplane in flight to the corresponding 4 description.
This force pushes the airplane upward like helium in a balloon
Drag
Lift
Thrust
Weight
Lift
When an airplane is landing, does the lift have to be less than or greater than the weight of the plane?
The lift must be less than the weight of the plane.
Match the forces of an airplane in flight to the corresponding 4 description.
This force is created by the movement of propellers or by the operation of jet engines.
Drag
Lift
Thrust
Weight
Thrust
What creates areas of high and low pressure in the Earth’s atmosphere? Check all the correct answers
a) Atmospheric pollution
b) Snow
c) Temperature variations
d) Storms
e) The movement of air masses
c) Temperature variations
e) The movement of air masses
Match the forces of an airplane in flight to the corresponding 4 description.
This force is caused by air resistance to the airplane’s movement
Drag
Lift
Thrust
Weight
Drag
In which direction does the wind move? Put an arrow between the labels to show your answer
High-pressure area ---------> Low-pressure area
High-pressure area <--------- Low-pressure area
High-pressure area ---------> Low-pressure area
Match the forces of an airplane in flight to the corresponding 4 description.
This force is exerted by gravity, which attracts the airplane toward the ground
Drag
Lift
Thrust
Weight
Weight