physics- multiple choice

1. A transport truck pulls on a trailer with a force of 600N [E]. The trailer pulls on the transport truck with a force
a) of zero
b) of less than 600 N is the truck is slowing down
c) equal to 600 N only if the truck is moving at constant velocity
d) equal to 600 N no matter what the acceleration of the truck
e) greater than 600 N if the truck is accelerating

2. If the net force is zero
a) the object is at rest
b) the obkect must be in outer space because all objects on Earth have gravity acting on them
c) the object must be slowing down because friction opposes motion
d) the object must be in free fall
e) the object must be at rest or moving at a constant velocity

3. A brick has a mass of 5.0kg and according to a spring scale 49.0N. When the brick is on another planet where the gravitational field force is two times the Earth, the balance will be ____ and the spring scale will read ____
a) 5.0kg; 49N
b) 10.0kg; 98N
c) 5.0kg; 98N
d) 10.0kg; 49N
e) impossible to determine without air resistance

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asked by Diane
  1. 1a.

    2e.

    3c.

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    posted by Henry

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