1) what is the difference between a push and a pull?
2) what will happen to a body when we pull it?
3)How can we change the direction of motion of a moving body?
4) How can we change the shape of the body ?
5) Define speed of a moving body?
6) How does a force change the speed of a body?
7) Give two examples each of situation in which you push or pull to change the state of motion to objects .
8) Give two examples in which the applied force causes change in the shape of the object.
answer the above questions in 30-40 words .
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Answers
1) Push and pull both are forces , but the difference is in their direction at which it is applied . If the force applied in the direction of motion of the particle then we call it as push .
If that force applied in the direction OPPOSITE to the motion of particle then it is termed as pull.
Consider a example , a particle is moving along positive x-direction .
case 1:
If the force is also applied in the positive x-direction on the particle then we are pushing the particle
case 2:
If the force is applied in the negative x-direction i.e, opposite to the motion of particle then we are pulling the particle
2) When we apply force on a body to change its shape size etc, a restoring force develops inside it, to prevent any change in its configuration. If the force applied becomes greater than the restoring force, the configuration (shape and size ) of the body changes accordingly.
3) They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. Remember that acceleration is a change in velocity.
4) The key is to choose exercises that will help balance out your proportions. A balanced exercise program is important but when you want to change your body shape you may need to work harder on some areas than others. To lose body fat a mixture of cardio and strength training is the most effective
5) Speed is the distance traveled per unit of time. ... Speed is the scalar quantity that is the magnitude of the velocity vector. It doesn't have a direction. A higher speed means an object is moving faster. A lower speed means it is moving slower.
6) Force is defined as a push or pull on an object. ... Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity.
7) Give two examples each of situations in which you push or pull to change the state of motion of objects.
Answer:
Two examples of push force are as follows:
A heavy box at rest is pushed to move it from one room to another. This changes the state of motion of the box.
A player pushes a football using his foot. This changes the state of motion of the ball.
Two examples of pull force are as follows:
Rope is pulled to draw water from a well. This changes the state of motion of the water bucket.
A drawer is pulled to open it. This changes the state of motion of the drawer.
8) (i) Making a chapati from a ball of dough.
(ii) Hanging a weight with a rubber band.
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Answer:
different between push and pull force