When you push on a wall, you

When no forces act on moving objects their paths are normally

When a bullet is fired from a rifle, which undergoes the greater acceleration?

An object’s weight is properly expressed in units of

 A car is pulled northward by a 20-N force at the same time a 40-N force pulls it southward.  The resultant force has a magnitude of

 The frequency of a certain wave is 4 Hz and its period is

An object moving at constant speed does so because

 A block pulled to the left with 20 N and to the right with 5 N at the same time experiences a net force of magnitude

The mass of a dog that weighs 400 N is about

The science of the mind and the reasons people act the way they do is called _________.