1.How do I find the force exerted by gravity on a mass? 2.When at rest, how do I

Question

1.How do I find the force exerted by gravity on a mass?
2.When at rest, how do I find the net force acting on a mass?
3.Use physic principles to explan why astronauts on the moon jump much higher thatn on earth, even while wearing cumbersome space suits.
4. I slide a heavy box (200kg)across the carpet at a steady velocity by pushing horizontally. My speed is a constant.2m/s. Here we take force of friction for a moving object (kinetic friction)=.3 x weight (or about 30% of the weight of the object. What is the net force on the box?
What is the size of the friction force in N? Therefore approximately how hard must I be pushing horizontally in N? How would the friction force change if my dog jumped on top of the box as I was pushing?

Explanation / Answer

1) m*g, where g is the acceleration due to gravity 2) At rest no net force acts on the body hence net force is 0 3) Since acceleration due to gravity at moon is less than that at earth so they can jump higher by the equation s = ut - 0.5gt^2 lower g higher distance keeping the speed and time constant 4) Since the speed is constant net force is 0 along both vertical and horizontal axis Frictional force = .3*200*9.8 = 588 N Approximatly 588 N force must be applied Frictional force would increase

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