A)An object at rest has no forces acting on it.
B)An object can be moving in one direction while the net force acting on it is in another direction.
C)In order to move a massive crate sitting on the floor, the force you apply to the crate has to overcome the force of the crate pushing back on you.
D)An object can be in motion and still have zero net force acting on it.
Which statements are true and which aren't?
That's what I had put at first but it marked it wrong. I don't understand.
A) Statement A is false. An object at rest can still have forces acting on it, such as gravity or friction.
B) Statement B is true. An object can continue to move in one direction while experiencing a net force acting in another direction. This is commonly seen in situations where there is a force of friction opposing the motion of an object.
C) Statement C is true. In order to move a massive crate, the force applied to the crate must be greater than or equal to the force of the crate pushing back against you. This is described by Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.
D) Statement D is false. An object in motion always has a net force acting on it. If there were no net force, the object would continue to move at a constant velocity (either at rest or in a state of uniform motion).
A) Statement A is true. According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by an external force. In other words, if there are no forces acting on an object, it will remain stationary.
B) Statement B is true. According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Therefore, an object can be moving in one direction while the net force acting on it is in another direction if there are other forces at play, such as friction or gravity.
C) Statement C is true. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. When you try to move a massive crate, you exert a force on it, but the crate exerts an equal and opposite force pushing back on you. In order to overcome this force and move the crate, you need to apply a greater force that overcomes the resistance.
D) Statement D is false. If an object is in motion, there must be a net force acting on it to cause that motion. According to Newton's second law, the net force applied to an object determines its acceleration, and an object cannot accelerate without a net force acting on it. Therefore, if an object is in motion, there must be a nonzero net force acting on it.
B and c are true
A and d are false