Lesson force if you say answer I will mark you as brainlist but don't spam
Answers
Answer:
4) Take you a A and your friend as B. if A acts more force on B the A will won the game. if B acts more force than the A it will won the game.
2) Yes, objects do change their state of motion due to net force. Explanation: If an object has a net force acting on it, it will accelerate/move forward or backwards. The object will speed up, slow down or change direction.
3) Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation. A free-body diagram is a special example of the vector diagrams that were discussed in an earlier unit. These diagrams will be used throughout our study of physics.
Explanation:
3)A free-body diagram is a representation of an object with all the forces that act on it. The external environment (other objects, the floor on which the object sits, etc.), as well as the forces that the object exerts on other objects, are omitted in a free-body diagram.
Below you can see an example of a free-body diagram:
Free-body diagrams are important because they allow us to analyze an object in isolation without distractions.
How to draw a free-body diagram?
You can draw a free-body diagram of an object following these 3 steps:
Sketch what is happening
Determine the forces that act on the object
Draw the object in isolation with the forces that act on it
Let's go through these steps in more detail.
Step 1: Sketch what is happening
This simply means that after you've read the problem once or twice, you sketch the object in its environment, and represent the main forces acting on the object (e.g. the push or the pull exerted by somebody, the friction force, etc.) so that you can clearly see what is going on.
For example, if a block is pushed over the floor with friction, a sketch of what is happening could look like this:
This sketch will help you determine what forces act on the object.
Step 2: Determine the forces that act on the object
Carefully observe your sketch, and think about all the forces that are acting on the object.
Returning to our example: the block is pushed, so a pushing force acts on the block; there is friction between the block and the floor, so a friction force acts on the block (opposing its motion); the block is subject to the force of gravity; the floor exerts the normal force on the block in order to prevent the penetration of the block.
Therefore, we come to the conclusion that 4 forces are acting on our block:
the push, F
the friction force, Ff
the normal force, N
and the gravitational force mg
Step 3: Draw the object in isolation with the forces that act on it
Finally, draw the object on its own (omitting external elements like other objects, the floor, the ceiling, etc.) and the forces that are acting on it.
In our example, we draw the block and the 4 forces that act on it:
And that's how you draw a free-body diagram.
Note: if you have multiple objects in a problem, you will need to draw a separate free-body diagram for each object, which you can do by following the 3 steps (step 1 being common to all objects, and step 2 and 3 specific to each object).
Examples of drawing free-body diagrams
To better understand how to draw free-body diagrams using the 3 steps, let's go through several examples.
Example 1
A box is pushed up an incline with friction which makes an angle of 20° with the horizontal. Let's draw the free-body diagram of the box.
The first step is to sketch what is happening:
The next step is to look at the sketch, and enumerate all the forces to which the box is subject:
the upward push, F
the force of friction, Ff
the normal force, N
and the force of gravity, mg
The final step is to draw the box with the 4 forces that act on it:
Example 2
A mass hangs from a rope attached to the ceiling. Let's draw the FBD of the hanging mass.
We begin with the sketch:
Looking at the sketch, we infer that there are only 2 forces acting on our mass:
the force of gravity, mg, which is pulling the mass downward
the upward tension exerted by the rope, T, which prevents the mass from falling
Finally, we draw the mass and the two opposite vertical forces that act on it:
Example 3
A sphere is hanging from two ropes attached to the ceiling. The first rope makes an angle of 30° with the ceiling, while the second rope makes an angle of 45° with the ceiling. Let's draw the free-body diagram of the sphere.
1) We sketch what is happening:
2) We look at our sketch and think of all the forces that act on the sphere:
the tension exerted by the first rope, T1
the tension exerted by the second rope, T2
and the force of gravity, mg
3) We draw the sphere with the 3 forces acting on it:
