Conceptual Dynamics

Question

Need help asap on the following question please!

Ash the Shipper wants to slide a heavy crate across a frictionless floor at a constant velocity of 2 m/s.

(select true: T OR false: F)

a) T F she needss to apply a force to get it moving.

b)T F She needs to apply a force to keep it moving

c)T F She needs to apply a force to stop it

2)Ash gets promoted. She becomes an astronaut and takes her crate far into outer space, where it is weightless.

a)T F She needs to apply a force to get it moving.

b)T F she needs to apply a force to keep it moving.

c)T F She needs to apply a force to stop it.

3)Ash pushes the crate across a frictionless floor with a constant force, causing it to accelerate. Would the acceleration be greatest on the earth or on the moon, or would it be a tie?

________________ (answer here).

Answer 1

Take a look at Newton's Law. The first law tells you that nothing can accelerate (change velocity) without a force acting on it. The second law tells you how force, mass, and acceleration relate to each other. The third law tells you that if you push on an object, it will push back with the same force.

Also think about how the different locations (different gravities) affect the situation. Does the mass change when the box is in space? What about when it's on the moon?