When you push a crate across a level floor at constant velocity, friction between the crate and the floor is

The speeds of the planets about the Sun depend on

The planet Jupiter takes a longer time to travel around the Sun than Earth because Jupiter

A bucket of cement is raised by a rope at constant speed at a construction site. Compared with the force of gravity on the bucket, the upward force supplied by the rope is

Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed for a satellite about Jupiter would be

Driving along the road at 100 km/h, Reckless Rick runs into Hapless Harry, who is directly in front of him and is driving at 74 km/h.  What is the impact speed–that is, the speed at which the two vehicles are approaching each other just before the collision?

If your automobile runs out of fuel while driving, the engine stops. You don’t come to an abrupt stop because of

The Universal Gravitational Constant G was first measured by

Find the average speed of a rabbit that runs a distance of 40 m in a time of 2.2 s.

You’re lying on the sand on a breezy day when a pesky fly wishes to join you. The breeze is blowing at a steady 1 m/s. If the fly wishes to land on you it should hover over you while flying