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What is Force?

A force is a push or pull that acts on an object due to the interaction with another object either by physical contact or due to action from a distance.

 

Contact Force

The types of forces that act when interacting objects are physically contacting each other. For example, frictional forces, normal forces, tensional forces, applied forces, and air resistance forces.

 
Non-Contact Force

The types of forces that act when interacting objects are physically separated from each other. For example, gravitational force, magnetic force, and electrostatic force.

 

Gravitational Force

The force of attraction between two bodies separated by a distance  having corresponding masses    would be:

 

Where, is a universal constant.

 

Also, gravity is the force of attraction exerted by the earth on objects.

Where, is the acceleration due to gravity. 

 

 

Electromagnetic Force

When two bodies are relatively at rest and separated by a distance  having corresponding charges . Then, the magnitude of force would be:

Where, is a constant.

 

 

Force by Spring

The magnitude of force due to the state of compression or extension of spring would be:

 

Where, the spring constant is , and the change in spring length is .

 

 

Normal Force

The reaction force which acts at the perpendicular to the contact surface. It is denoted by , or .

 

 

Friction Force

The force exerted by the contact surface to the object, when the object makes an effort to change its position.

 

Where, is the coefficient of friction.

 

 

Force Questions & Answers – Sample

 

 

Question 1: Two charged particles, each with of charge, are separated by a distance of . Find the magnitude of the force between them.

 

Explanation: We have given charge of particle, and distance between them.

We will use the formula:

And, we have, . Also, .

Final answer: The magnitude of the force would be .

 

 

Question 2: Calculate the force acting on a block due to gravity.  The block has a mass of .

 

Explanation: We have given the mass of the block. And, acceleration due to gravity is .

Final answer: The force of attraction due to gravity would be .

 

 

Question 3: Calculate the magnitude of force required to pull a spring . The spring constant is .

 

Explanation: We have given spring constant and elongation due to pull force.

Final answer: The magnitude of the force would be .

 

 

 

One-stop-resource for homework help on Force formulas, equations, definition and unit problems

 

A push or pull upon an object, or any interaction, when unopposed changes the direction of that object is called Force. As a vector quantity it has both direction and magnitude.

 

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Frequently Asked Questions

 

 

What are intermolecular forces?

 

Intermolecular force or IMF is the force that applies between the molecules. The IMF between molecules is a week force. However, it is responsible for determining the physical properties of a substance. 

 


What are magnetic forces?

 

Magnetic forces are repulsive, or attractive force, that is caused due to motion of charges. Objects having charges moving in the same direction will result in attractive magnetic force. Whereas, objects having charges moving in opposite directions, would have a repulsive magnetic force.

 


How do forces act on objects?

 

The force acts on an object due to the interaction with another object, either by physical contact or due to action from a distance.

 


How do forces work?

 

A force when acts on an object could results in moving the object from its initial position, increasing or decreasing the speed of any object, or it could also deform the shape of the object.

 


How forces affect motion?

 

Forces can affect the motion of an object by decreasing or increasing the speed of the object. If the magnitude of the force is greater, it can also stop the motion of the object. And, even change the direction of the motion.

 


How forces are measured?

 

It can be measured using a newton meter. Newton meter or force meter has a spring attached to a hook. When a force acts on the hook, the spring stretches. And, we can measure the corresponding reading, which will be the magnitude of force applied.


Force is measured in newtons, and the unit has the symbol N.

 

 

 

How forces affect our everyday lives?

 


Forces have a great impact on our everyday lives. Let us analyze the effect of some forces.

 

Friction Force: This force helps us to walk, without friction force we could not walk easily. Imagine, someone walking on snow or ice. You might see, the person having difficulties in walking with a regular shoe. This is because there is less friction on that surface.

 

Gravitational Force of Attraction: Let us focus on the gravitational force of attraction by the earth. If you hit a ball, you will see that it will be attracted by the earth and after a few moments, the ball will no longer remain on air. Without the gravitational attraction, the ball would have continued going upward!!

 


How forces affect the motion of an object 

 

The force can affect the motion of an object in different ways depending upon the direction in which force is applied, and the magnitude of the force.

 

If force is applied in the same direction as the motion of the object, it will increase its speed. And, if the direction of the application is the opposite, it will decrease the object’s speed.

 

Also, if the applied force has a greater magnitude, and acts in the opposite direction of motion. Then, it can stop the motion of the object, or even change the direction of motion.

 


Can we see forces?

 


No, we can not see the force physically. But, we can feel it. And, we can see the changes made by the application of force.

 


What forces are non-contact? 

 

Gravitational force, magnetic force, and electrostatic force are some examples of non-contact force. They act without physically interacting with the objects. Their action is from a distance.

 


What are the four main types of forces?

 

  • Gravitational Force: It is a force of attraction between two masses separated by some distance.
  • Electromagnetic Force: It acts between two charges, depending upon the nature of the charge, it could be attractive or repulsive.
  • Strong Nuclear Force: The effect of the force is strong, but the range of influence is short. Example: 
  • Week Nuclear Force: The week force has short-range, and it is weaker than gravity. Radioactive decay is an example.

 

 

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