A box is pushed eastward across a rough horizontal floor by a force acting parallel to the floor. A force providing an impulse directed westward on the body is

A gun is made of a super-low-weight but strong material. The bullet for the gun is more massive than the gun itself. For such a gun

A ping-pong ball is dropped vertically onto a stationary bowling ball resting on the floor. Which of the balls experiences the greater force as a result of the collision?

A body is suspended from a spring hanging vertically. The body is then pulled downward so the spring stretches. Consider the change in the elastic potential energy (EPE) of the spring and the change in gravitational potential energy (GPE) as the body is pulled down.

A physics professor places a soda pop can on the table and asks a student to identify the forces acting upon the can and the directions of each force. The two forces acting on the soda pop can are

A common experience is to find that a steady pull is required to keep an object moving, even on a level surface, when friction is present. Analyzing this experience in light of the laws of motion, the accepted conclusion is that

The momentum of a truck is increased by a factor of 2; its weight does not change. Thus,

If a single force acts on a moving object

In this diagram a force acting on a block is shown by the arrow labeled F. The mass of the block is known, as is the size of the force, but the observed acceleration is larger than F/m and so another force must act on the block. In which direction (A, B, C, or D) is this force?

A bullet is fired straight down from a hovering helicopter. If we neglect air friction, then the speed of the bullet