Formula Review for Chapter 12 (Forces & Newton's Laws) -- With Solutions

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Formula

Units

Word Problem

Solution

401

F = m * a

Newton

1) What is the net force needed to accelerate a 1.5 x 10³ kg automobile forward at 2.2 m/s/s?

401

F = m * a

Newton

2) A baseball that has a mass of 0.16kg accelerates downwards at 9.8 m/s/s. What is the gravitational force acting upon the baseball?

401

F = m * a

Newton

3) A 3.8kg model airplane accelerates at 2.1 m/s/s. What is the net force acting on the airplane?

415

P = m * v

kg-m/s

4) Calculate the momentum of a 85 kg speed skater moving forward at 15m/s

415

P = m * v

kg-m/s

5) Calculate the momentum of a 125 kg ostrich running north at 14.2 m/s.

R
e
v
i
e
w

           D
 V =    ----
           T

m/s

6) A ball rolls down a 4m ramp in 3 s. What is its average velocity?

R
e
v
i
e
w

km/hr/s

7) A rocket slows down from 7100 km/hr to 2250 km/hr in 9 seconds.  What is its average acceleration?