When forces are exerted on an object, sometimes those forces will cause the object to be stretched, squeezed, or twisted. We define the strength of the force that might cause an object to be stretched, squeezed, or twisted as .

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

If the textbook weighs 19.6 newtons on venus, what is the strength of gravity on venus?

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?