How Does Newton's 2nd Law Apply in Different Force Scenarios?

Fa is 1.5 N and for the second one, Fa is 14.5 N.In summary, in this conversation, two figures (5-51a and 5-51b) are discussed where a constant horizontal force is applied to blocks A and B, which have a combined mass of 14.0 kg. In figure 5-51a, block A pushes against block B with a 20.0 N force to the right, resulting in an acceleration of 1.5 N. In figure 5-51b, block A pushes on block B with a 10.0 N force to the left, resulting in an acceleration of 14.5 N. Fa, the force applied
  • #1
jactre
4
0
In Figure 5-51a, a constant horizontal force a is applied to block A, which pushes against block B with a 20.0 N force directed horizontally to the right. In Figure 5-51b, the same force is applied to block B; now block A pushes on block B with a 10.0 N force directed horizontally to the left. The blocks have a combined mass of 14.0 kg. What are the magnitudes of (a) their acceleration in Figure 5-51a and (b) force Fa?

Figure is attached

I drew a free body diagrams and came up with:
a) Fa +Fab = 14a
Fa + 20 = 14a

b) Fa -Fab = 14a
Fa - 10 = 14a

I don't know what to do from here. Any guidance is appreciated!
 

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  • #2
30=14a for the first one
 

Related to How Does Newton's 2nd Law Apply in Different Force Scenarios?

What is Newton's 2nd Law of Motion?

Newton's 2nd Law of Motion states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. This means that the greater the force acting on an object, the greater its acceleration will be, and the more massive an object is, the less it will accelerate.

How do you calculate force using Newton's 2nd Law?

To calculate force using Newton's 2nd Law, you can use the formula F=ma, where F represents force in Newtons, m represents mass in kilograms, and a represents acceleration in meters per second squared. This formula can also be rearranged to find the mass or acceleration of an object if the other two variables are known.

Can Newton's 2nd Law be applied to all objects?

Yes, Newton's 2nd Law can be applied to all objects, regardless of their size, shape, or composition. This law applies to both stationary and moving objects, as well as objects in both linear and rotational motion.

How does Newton's 2nd Law relate to everyday life?

Newton's 2nd Law can be observed in many everyday situations. For example, when pushing a shopping cart, the harder you push (force), the faster the cart will move (acceleration). Similarly, when driving a car, pressing down on the gas pedal (force) causes the car to accelerate. This law also explains why it is easier to push a lighter object than a heavier one.

What are some common problems involving Newton's 2nd Law?

Some common problems involving Newton's 2nd Law include calculating the force needed to accelerate an object to a certain velocity, finding the mass of an object based on its acceleration and the force acting on it, and determining the acceleration of an object based on its mass and the force applied to it. These types of problems are often encountered in physics and engineering courses.

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