On Planet X, a 70 kg object can be lifted by a force of 400 N

In summary, on Planet X, a 70 kg object can be lifted by a force of 400 N. This is due to the planet's lower gravitational pull compared to Earth, making it easier to lift heavier objects with less force. However, the object's weight will still remain the same on both planets. This phenomenon is explained by Newton's Second Law of Motion, which states that the acceleration of an object is directly proportional to the force applied and inversely proportional to its mass. Therefore, on Planet X, the same force results in a greater acceleration and allows for the lifting of heavier objects.
  • #1
EJ25
4
0
On Planet X, a 70 kg object can be lifted by a force of 400 N
Suppose your car was taken to Planet X. If the car has a mass of 1500 kg, what would its weight be?

W=mg

a=W/m
a=400/70
a=5.7m/s/s

W=1500*5.7
W=8550N

on the site http://library.thinkquest.org/10796/ they say that the answer is incorrect. Quiz is under 4. Forces and Newton's Laws/scroll down to the bottom
 
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  • #2
Welcome to PF!

Hi EJ25! Welcome to PF! :smile:

I suspect you didn't use enough significant figures in your intermediate stages …

it's always best to use an extra figure or two until just before the end :wink:
 
  • #3
Hi

thank you very much and thanks for the info.
 

FAQ: On Planet X, a 70 kg object can be lifted by a force of 400 N

How is it possible for a 70 kg object to be lifted by only 400 N of force on Planet X?

The amount of force required to lift an object is dependent on the gravity of the planet. On Planet X, the gravity is much lower than that of Earth, so less force is needed to overcome its gravitational pull and lift objects.

Can a person easily lift heavy objects on Planet X due to its low gravity?

Yes, due to the lower gravity on Planet X, a person can easily lift heavy objects that would be much more difficult to lift on Earth.

How does the force needed to lift an object change on different planets?

The force needed to lift an object changes based on the gravity of the planet. On planets with lower gravity, less force is needed to lift objects compared to planets with higher gravity.

Is the force needed to lift an object on Planet X the same for all objects?

No, the force needed to lift an object on Planet X may vary depending on the mass of the object. The greater the mass of the object, the more force is needed to lift it, even on a planet with lower gravity like Planet X.

What other factors besides gravity can affect the force needed to lift an object?

The force needed to lift an object can also be affected by air resistance, friction, and the strength of the person or lifting mechanism. These factors may vary on different planets and can impact the amount of force needed to lift an object.

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