When a 5-N block of wood floats in mercury the buoyant force on it is

Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them

With no air resistance a projectile fired horizontally maintains its horizontal component of velocity because

If you push for an hour against a stationary wall, you do no work

Marie pushes horizontally on her desk, but not hard enough to get it moving. The friction force acting on the desk is

Driving along the road at 96 km/h, Reckless Rick runs into Hapless Harry, who is directly in front of him and is driving at 78 km/h.  What is the impact speed–that is, the speed at which the two vehicles are approaching each other just before the collision?

Inside a freely-falling elevator you would have no

Emily Easygo can paddle her canoe at 8 m/s in still water. With this speed she then paddles upstream in a river that runs downstream at 6 m/s. Her friend sitting on shore sees her speed as

What is the acceleration of a scooter that maintains a constant velocity of 15 m/s for 10 s?

Aristotle believed that natural laws could be understood by