How can you tell based on observing an object that there is a net force acting upon that object?

The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.

What is the force of an object if it is not accelerating?

An object that is not accelerating means that it is either at rest or moving with constant velocity. When it is at rest, all the forces acting on it is balanced in all directions so the net force is zero.

How would you describe the velocity and the acceleration of an object when the net force acting on it is not zero?

Newton’s first law is a special case of Newton’s second law when F = 0. Since m is not zero, acceleration must be zero. Hence, the velocity must remain contant. An object at rest is one with zero velocity.

What do you think will happen to the acceleration of an object if its force will be doubled and its mass will be kept constant?

The acceleration is equal to the net force divided by the mass. If the net force acting on an object doubles, its acceleration is doubled. If the mass is doubled, then acceleration will be halved. If both the net force and the mass are doubled, the acceleration will be unchanged.

Does force and acceleration have proportional relationships?

Newton’s second law of motion describes the relationship between force and acceleration. They are directly proportional. If you increase the force applied to an object, the acceleration of that object increases by the same factor. In short, force equals mass times acceleration.

What can be concluded about the forces experienced by the two objects?

What can be concluded about the forces acting upon the object? All the individual forces acting upon the object are balanced.

How do you find force without acceleration?

Since there is no vertical acceleration, normal force = gravity force. The mass can be found using the equation Fgrav = m • g. The Fnet is the vector sum of all the forces: 80 N, up plus 80 N, down equals 0 N.

When does an object undergo acceleration?

then the velocity/ speed of an object can increase or decrease. If a force acts on object then it accelerates. hence option (D) A force always acts on it is the correct answer.