What is equilibrium? when there are no forces
when all forces acting on an object remain the same
when an object does not move
when the forces acting on an object change

If a balloon is taken outside on a very cold day, what will occur?

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.