Resultant Forces and Free Body Diagrams

These flashcards cover key concepts related to resultant forces and free body diagrams as discussed in the lecture.

What is a resultant force?

A single force that has the same effect as all of the original forces acting together.

How do you calculate the resultant force when two forces act in opposite directions?

Subtract the smaller force from the larger force.

In the example of a man pushing a box, what is the resultant force?

10 Newtons acting to the right.

What are forces described as, and why?

Forces are vector quantities because they have both magnitude (size) and direction.

What does a free body diagram represent?

A visual representation of the forces acting on an object, with the object shown as a point.

What does the length of the arrows in a free body diagram indicate?

The size of the force.

What is the upward force on the skydiver called?

Air resistance.

When a skydiver is falling at a constant velocity, what can be said about the forces acting on them?

The forces are balanced, hence the resultant force is zero.

What is lift in the context of an airplane flying at constant altitude?

The force acting upward, equal in magnitude to the weight of the airplane acting downward.

What are the forward and backward forces acting on an airplane?

Thrust (forward force) and air resistance (drag, backward force).

What must be true about the forward and backward forces when an airplane is moving at constant velocity?

They must be balanced.