1. A light (mass m) and a heavy object (mass m2) are dropped at the same time. W

Question

1. A light (mass m) and a heavy object (mass m2) are dropped at the same time. Which object accelerates faster? Explain using Newtons second law. (1-2 sentences) 2. A force of 10 N is applied both to a light (mass m) and a heavy object (mass m). Are both objects accelarated at the same rate? Explain using Newtons second law. (1-2 sentences) 3. The acceleration of gravity on the moon's surface is about 1/6 of that on the Earth's surface An object on the Earth is to be taken to the Moon. Compared to the Earth,the object's mass will be ) the same on the Moon. ) greater on the Moon. ) less on the Moon. 4. How does the weight of the object compare to its weight on Earth, ) the object's weight will be less on the Moon. () the object's weight will be the same on the Moon. ) the object's weight will be greater on the Moon. 5. Two equal-magnitude forces (Fi - F2) are acting horizontally on a box in opposite direction (Fig. 1). Is the box accelerated horizontally? F2 F1 O YESNO What direction will the acceleration have, if Fig. 1

Explanation / Answer

1. they will be in free fall.

both will have same acceleration.

a = g = - 9.8 m/s^2  

(from Newton's 2nd law) Fnet = m a

when in free fall, Fnet = m g

so m g = m a => a = g

2. Now, F = 10 N  

a = F / m = 10 / m

so accceleration of heavy mass will be less.

light mass will have greater acceleration.

3. mass is independet of acc.

Ans: the same on moon

4. Weight = m g

weight on earth > weight on moon

Ans: the object's weight will be less on the moon.

5. Fnet = F1 - F2 = 0

Fnet = m a = 0

so a = 0

Ans; No

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