What is the concept called when the poles of an electromagnet flip?

How much force is needed to accelerate a 1000Kg car at a rate of 3m/s2?

A force of 150 N accelerates a 25 kg wooden chair across a wood floor at 4.3 m/s2. How big is the frictional force on the block? What is the coefficient of friction between the chair and floor?

When one ball is raised, it acquires potential energy which is then transformed into kinetic energy once the ball is released. In theory, the total energy should be conserved such that the balls continue in perpetual motion.

What is the gravity on a planet with 25,000,000kg and radius of 20m?

Which illustration represents the substance at a higher temperature

An object's weight is equal to its buoyant force in water. What would you expect to happen when the object is placed in water? Explain your reasoning.

What is the name of the german scientist that proposed the theory of continental drift

Trucks 1 and 2 are traveling at the same constant velocity but truck 1's energy due to motion is two times less than that of truck 2. This is because Truck 1's mass is:

Why do the densities of most substances decrease with an increase in temperature?

Consider two planets in space that gravitationally attract each other if the mass of one of them stays the same and the mass of the other is doubled AND the distance between them is doubled, then the force between them changes by what factor? A.