Help with Newtons Second Law Question Please.

In summary, to calculate the force needed to accelerate a 2.0kg ball at 3.0ms^2, the equation F = m*a can be used. In space, a long way from Earth and on a frictionless horizontal surface near the surface of the earth, the force needed would be 6N. However, if the acceleration is vertically upward near the surface of the earth, the force needed would be either 13.6N or 25.6N, depending on the calculation method used.
  • #1
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Homework Statement



Calculate the force needed to accelerate a 2.0kg ball at 3.0ms^2

(A) In space, a long way from Earth.
(B) On a frictionless horizontal surface, near the surface of the earth.
(C) vertically upward, near the surface of the earth.

Homework Equations



F = m*a

The Attempt at a Solution



(A) F = 2.0 * 3.0
F= 6N?

(B) Same as above?

(C) I am confused on this one.

Would it be F = m*a

F = 2.0 *(9.8 - 3.0)
F= 2.0 * 6.8
F= 13.6N?

or

F = 2.0 * 12.8 (To get from -9.8 to 3 = 12.8)
F= 24.8N

If those answers are wrong could anyone point me in the right direction as to what I am doing wrong?

Thanks.
 
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  • #2
Edit: Aha, check your final line, you sure That 2 * 12.8 = 24.8? 0.o

First two are fine
 
  • #3
Chewy0087 said:
Edit: Aha, check your final line, you sure That 2 * 12.8 = 24.8? 0.o

First two are fine

Ahaha... I mean 25.6 :)
 
  • #4
thats right
 

What is Newton's Second Law?

Newton's Second Law, also known as the Law of Acceleration, states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass.

How is Newton's Second Law used in physics?

Newton's Second Law is used to mathematically describe the relationship between force, mass, and acceleration. It is commonly used in physics to analyze the motion of objects and predict the resulting acceleration.

What is the formula for Newton's Second Law?

The formula for Newton's Second Law is F=ma, where F represents force, m represents mass, and a represents acceleration.

Can Newton's Second Law be applied to all types of motion?

Yes, Newton's Second Law can be applied to all types of motion, including linear, circular, and rotational motion. It is a fundamental law of physics that applies to all objects regardless of their shape, size, or speed.

How does friction affect Newton's Second Law?

Friction is a force that acts in the opposite direction of an object's motion, which can affect the acceleration of the object. Therefore, when calculating the net force on an object, the force of friction must be taken into account. This means that friction can decrease the acceleration of an object, making it harder to move and requiring more force to achieve the desired acceleration.

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