Gr 5 - Energy Unit

What are the main opposing forces in flight?

• Lift vs. Gravity and Thrust vs. Weight
• Lift vs. Weight and Thrust vs. Drag
• Lift vs. Drag and Thrust vs. Gravity
• Weight vs. Gravity and Thrust vs. Lift

Which force must counteract weight to keep an airplane in the air?

• Thrust
• Drag
• Lift
• Friction

What force opposes thrust in flight?

• Weight
• Lift
• Drag
• Heat

What is the primary purpose of thrust in flying objects?

• To push them forward through the air
• To lift them off the ground
• To reduce drag
• To balance weight

What creates lift in flying objects?

• Engines
• Wings or lifting surfaces
• Propellers
• Gravity

Lift counteracts which force?

• Thrust
• Drag
• Weight
• Buoyancy

What is drag?

• The force that moves an object forward
• The upward force that allows objects to rise
• The force that opposes thrust (an object's motion through a fluid)
• The measure of the force of gravity acting on an object

Which of the following experiences drag?

• A bird flying
• A boat floating
• A bike rider feeling air resistance
• All of the above

Thrust is generated by which of the following?

• Wings
• Gravity
• Engines or propellers
• Buoyant force

For an airplane to fly smoothly, thrust must be

• Greater than or equal to drag
• Less than drag
• Equal to weight
• Greater than lift