1) A car accelerates from rest to 30 m/s in 5 seconds. If the car\'s mass is 100

Question

1) A car accelerates from rest to 30 m/s in 5 seconds. If the car's mass is 1000 kg, what force is needed to produce this acceleration?

2) Acceleration is defined as the change in velocity over change in time (delta v/deta t). Yet the book gives a different equation for acceleration on page 58 using Newton's Second Law:

acceleration = Force/mass.

How should we reconcile or understand these two different equations for acceleration?

3) Explain what happens to the mass and weight of a 10-pound bag of flour when taken to the Moon.

Please answer in full sentences and details. Thanks! :)

Explanation / Answer

1) Acceleration = delta v/deta t
= 30/5 = 6m/s^2

Force = mass * acceleration
= 1000*6 = 6000 N

2) These two equations are related and both are correct.

Acceleration is defined as the rate of change of velocity wth respect to time.
The newton's second law if F= m* dv/dt

and dvdt or delta v/ delta t is acceleration.

3) Mass is a property of a substance, it won't change in any case, whereas weight would decrease when taken to moon.

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