Podcast
Questions and Answers
What is a force?
What is a force?
- Only the gravitational pull between objects
- A movement of an object in a circular path
- A push or pull upon an object due to its interaction with another object (correct)
- A change in the temperature of an object
When does a force cease to exist between two objects?
When does a force cease to exist between two objects?
- When the objects come to a complete stop
- When the objects are moving at the same speed
- When the interaction between the two objects ceases (correct)
- When the objects are in water
Which of these is an example of a force without human or animal effort?
Which of these is an example of a force without human or animal effort?
- Wind blowing against a tree (correct)
- A person lifting a box
- A bullock pulling a cart
- A person pushing a car
What happens when a rubber ball on a smooth surface is pushed gently?
What happens when a rubber ball on a smooth surface is pushed gently?
What is one effect of pushing a moving rubber ball harder?
What is one effect of pushing a moving rubber ball harder?
What happens when you push against the motion of a rolling ball?
What happens when you push against the motion of a rolling ball?
In what condition does the speed of the ball decrease and it can come to rest?
In what condition does the speed of the ball decrease and it can come to rest?
Which of the following statements is true about force?
Which of the following statements is true about force?
What can a change in the state of motion include?
What can a change in the state of motion include?
Which activity demonstrates a change in the state of motion?
Which activity demonstrates a change in the state of motion?
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Study Notes
Motion and Force
- Motion is an integral part of our daily lives, and it can be uniform or non-uniform.
- An object at rest does not start moving on its own; an external force is needed to make it move.
- We exert a force when we push, pull, kick, or lift an object, which involves an external agency (often a muscular effort).
Characteristics of Force
- A force comes into play only when at least two objects interact with each other.
- A force can change the speed, direction of motion, or both of an object.
- The application of force can increase or decrease the speed of an object, depending on its direction.
Effects of Force
- A change in the state of motion of an object is described as a change in its speed, direction of motion, or both.
- A force can bring an object from rest to motion, stop a moving object, or change its direction of motion.
Force and Interaction
- A force exists only as a result of some interaction between two objects.
- Force does not always involve effort by living beings; it can also be due to natural causes.
Examples of Force
- Drawing a bucket from a well, opening or closing a table drawer, squeezing wet clothes, pedaling a bicycle, and moving a loaded trolley all involve force.
- A hockey player taking a penalty corner shot also involves force.
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