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A force is a push or pull that acts upon an object as a result of that objects interactions with its surroundings. In this Lesson, The Physics Classroom differentiates between the various types of forces that an object could encounter. Some extra attention is given to the topic of friction and weight.
- Drawing Free-Body Diagrams
The motion of objects is determined by the relative size and...
- The Meaning of Force
A force is a push or pull upon an object resulting from the...
- Determining The Net Force
The net force is the vector sum of all the forces that act...
- Newton's Second Law
The Toolkit promotes the ability to recognize forces in a...
- Free Fall and Air Resistance
In a previous unit, it was stated that all objects...
- Drawing Free-Body Diagrams
Sal defines and compares tension, weight, friction and normal forces using free body diagrams.
- 8 min
- Gravity naturally pushes down on the 5N object intern pushing down on the 10N shelf which if you follow it back was created by gravity which is a n...
- you are saying constant acceleration not 0 zero acceleration , constant means it remains the same NOT 0 , so there has to be some acceleration in o...
- The normal force is acting downwards because there is nothing under the shelf to counteract its force by providing an upward acting force (except t...
- No, not always. The normal force is (you guessed it) normal to the surface the object is in contact with. If you hold it against the ceiling, the n...
- when you let go of an untied balloon, the force of the balloons weight pulls the the balloon down and the force of the air pushing up from within t...
- Yes, it is, in fact, it can be due to friction an object has inertia. Inertia is defined as an object will be in motion as long as it is affected b...
- There would still be anormal force applied.
- Mass triggers friction (if on Earth or other body), and its the friction that causes the object to move: At the 5 minute mark, the friction from al...
- Overview
- Key points:
Review your understanding of action and reaction forces in this free article aligned to NGSS standards.
•For every force, there is an equal and opposite reaction force.
•Let’s think about an example: when you push on a box, the box pushes back on you. Your push on the box is the action force. The force from the box on you is the reaction force. The two forces have the same strength, but they act in opposite directions.
When forces in a particular dimension do not cancel each other out, they're unbalanced and result a nonzero net force. Explore balanced and unbalanced forces through five different scenarios involving a rock and various forces acting on it.
- 8 min
- Sal Khan
Do traditional movements (squats, deadlifts, etc.) loaded at near maximal intensities produce high forces, or can you manipulate components of the Force equation (Force = Mass x Acceleration) to expose athletes to higher peak ground reaction forces?
Learn about the impact of excessive g-force on the human body and its physiological effects.
People also ask
What is a force in physics?
What is a normal force?
What is the difference between balanced and unbalanced forces?
Does every force have an equal and opposite reaction force?
These four basic forces are known as fundamental because they alone are responsible for all observations of forces in nature. The four fundamental forces are gravity, electromagnetism, weak nuclear force , and strong nuclear force .
