Question

A 1-kg object is moving with a speed of 10m/s in space. How much net force is required to keep the object moving at this velocity? What would be the object's acceleration? Explain.

Answer 1

Answer:

Change in velocity 

−2−10=−12

Time required is 4 seconds 

a=Δv/t

=−12/4

=−3m/s²

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Answer 2

Given:

A 1-kg object is moving with a speed of 10m/s in space.

To find:

• Net force needed ?
• Acceleration of object?

Calculation:

As per Newton's 2nd law of Motion,

• Force on an object proportional to the rate of change of linear momentum with respect to time.

• Force = ∆P/∆T .

When the 1 kg object is moving with a constant speed of 10 m/s, the momentum of the object is not changing with time. This means : ∆P = 0 .

So, the force experienced will be zero.

• Also, since force experienced is zero, the acceleration of the object will also be zero.

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