8. An automobile cannot maintain a constant speed when? A) accelerating. B) roun

Question

8. An automobile cannot maintain a constant speed when? A) accelerating. B) rounding a curve. C) Both of the above. D) None of the above 9. If a ball rolls down an inclined plane and gains 4 m/s each second it rolls, its acceleration is? A) one half of 4 m's. B) one half of 4 m/s2, C) 4 m/s2 D) 10 m/s2, 10. A motor scooter undergoes acceleration when it? A) gains speed B) decreases speed. C) changes direction. D) all of the above 11. If a falling object gains 10 m's each second it falls, its acceleration is? A) 10 m/s. B) 10 m/s per second. C) Both of the above. D) Neither of the above. 12. At the end of 1/2 second an apple freely falling from rest has a speed of? A) 1 m/s. ) 5 m/s. C) 10 m/s. D) more than 10 m/s. 13. If a ball rolls down an inclined plane and gains 4 m/s cach second it rolls,its acceleration is? A) one half of 4 m/s. B) one half of 4 m/s2. C) 4 m/s2. D) 10 m/s2 14. A freely-falling object has a speed of 30 m's at one instant. Exactly A) the same. B) 40 m/s. C) 50 m/s. D) more than 50 m/s. 2 seconds later its speed will be? 15. Newton's second law focuses on? A) speed. B) velocity C) acceleration. e of the above D) non

Explanation / Answer

8) c

When rounding a curve, the automobile is accelerating because it is changing direction.

9)

c

10)

D - All of these

11) B

It is common to express 10 m/s per second as 10 m/s2.

12)

5 m/s.

13)

C

14)

One second later its speed will be 40 m/s,two second later which is 50 m/s.

15)

C

Newton's second law of motion states that the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass

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