6. Intro to Forces (Dynamics)

An object moves along a straight line and is at position A, where its velocity is decreasing in the positive $x$-direction. What is the direction of the net force acting on the object at position A?

When replacing a system of multiple forces acting on a rigid body with an equivalent resultant force, which of the following statements is correct about the resultant force and its point of application?

Which of the following situations depicts an object experiencing unbalanced forces? Choose the correct option.

In the context of forces and kinematics, which force is best represented by $fg$?

In the context of forces and kinematics, when replacing the force system acting on a post by a single resultant force, what does the resultant force represent?

Which of the following is a long-range force that can act on a crate at rest on the ground?

Why doesn't the $F$orce of a bowling ball always knock down every pin when it strikes them?

Which of the following does not affect the distance required to stop a vehicle moving at a certain $v$?

A uniform horizontal beam weighs $190N$ and its center of gravity is at its center. If the beam is supported at both ends, what is the magnitude of the upward force exerted by each support when the beam is in static equilibrium?

A rocket of mass m is launched straight up with thrust F_thrust. Find an expression for the rocket's speed at height h if air resistance is neglected.

Which of the following factors most directly determine how much $F$ an object exerts when it collides with another object?

A car is being pulled out of the mud with a constant horizontal force. If the car starts from rest and the force remains constant, what can be said about the car's acceleration and velocity as it is being pulled?

Why does a feather not fall at the same rate as an apple when dropped from the same height on Earth?

Compressed air is used to fire a 50 g ball vertically upward from a 1.0-m-tall tube. The air exerts an upward force of 2.0 N on the ball as long as it is in the tube. How high does the ball go above the top of the tube? Neglect air resistance.