Non-contact Forces

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Questions and Answers

If two objects are observed to repel each other, what can be definitively concluded about the forces acting between them, considering only the fundamental forces described?

At least one of the objects must have a net electric charge or magnetic polarity. (correct)
Both objects must have the same magnetic polarity.
The gravitational force between them is negligible compared to the repulsive force.
Both objects must have the same net electric charge.

Consider a scenario where an object experiences no net force. Which of the following statements must be true regarding the individual forces acting on the object?

The vector sum of all forces acting on the object is zero. (correct)
No forces are acting on the object whatsoever.
All forces acting on the object are contact forces.
The object is only affected by non-contact forces.

Two particles, one charged and one neutral, are placed near each other. Which statement is most accurate?

There will be no forces between them.
There will be an electrostatic force between them.
There will be both electrostatic and gravitational forces between them.
There will be a gravitational force between them. (correct)

A spacecraft far from any planet is described as experiencing 'weightlessness'. What does this truly imply regarding the gravitational forces acting on it?

The spacecraft is in freefall, and its perceived weight is zero. (B) Signup and view all the answers

Consider an electrically neutral object. How can it still be affected by electrostatic forces?

Through induction, causing charge polarization within the object. (A) Signup and view all the answers

Two magnets are placed such that their north poles are facing each other. Evaluate the statement: 'Because the poles are identical, the forces must be equal; therefore, the magnets will not move'.

The statement is incorrect because the forces are not necessarily equal unless the magnets are identical and equidistant from each other. (D) Signup and view all the answers

How does the strength of the gravitational force change between two objects if the mass of both objects is doubled and the distance between them is also doubled?

It remains the same. (A) Signup and view all the answers

In what fundamental way does the nature of gravitational force differ from both electrostatic and magnetic forces?

Gravitational force is always attractive, while electrostatic and magnetic forces can be either attractive or repulsive. (C) Signup and view all the answers

Imagine a scenario with three charged particles. Particle A and Particle B are positively charged, and Particle C is negatively charged. Particle A and C are held fixed. Particle B is free to move. What can be said of particle B?

Particle B will move toward a point where the attractive force of Particle C cancels out the repulsive force of Particle A. (A) Signup and view all the answers

If a spaceship is moving at a constant velocity in deep space, far from any significant gravitational fields, what can be said about the net force acting on the spaceship?

The net force is zero. (B) Signup and view all the answers

Flashcards

What are Forces?

Interactions between particles/objects, divided into contact and non-contact types.

What are Contact Forces?

Forces exerted when objects are physically touching.