If an object is not moving, does that mean that there are no forces acting on it? Explain.

A freight train has a mass of 1.4 x 10' kg. If the locomotive can exert a constant pull of 6.8 x 105 N, how long does it take to increase the speed of the train from rest to 68 km/h? min

A box with a mass of 5 kg sits on a flat table. The Earth pulls on this object with force equal to the weight of the object (49N).    If this is the action force, what is the reaction force?   The table pushing down on the floor with force of 49N.      The box pushing down on the table with force of 49N.      The normal force pushing up on the box with force of 49N.      The box pulling upward on the Earth with force 49N.

37. A suitcase with mass 18 kg is pulled at a constant speed by a handle that makes an angle θ with the horizontal. The frictional force on the suitcase is 27 N and the force applied on the handle is 43 N. (a) Determine the value of the angle, θ. (b) Determine the normal force exerted on the suitcase.

A force of 25 N acts to the right on a 100.0 kg block which is at rest on a rough surface( Us = 0. 200). The frictional force acting upon the block is: 171 N 196 N None of the above 25 N

If an object is at rest, it will remain at rest unless an external force makes it move. Which of Newton’s laws describes this situation?

Three different forces act on an object. They are: F1 - 5, – 7 > 2 = - Find the net force Fnet on the object (the sum of the forces) Fnet Find what fourth force, F, would need to be added so the object feels no force, that is, so Fnet F4 =

31. A truck with mass 2000 kg tows a boat and trailer of total mass 500 kg. The frictional coefficient for the truck is 0.080 and for the trailer is 0.050 (this is due to “rolling resistance” of the tires). The force of the truck’s drive wheels pushing backward on the pavement is 3.0 kN. (a) Determine the acceleration rate of the truck and trailer moving forward together. (b) Determine the amount of force the truck’s hitch exerts forward on the trailer.

An object is at rest on a table. The earth is pulling this object down with a force of magnitude m · g. If we consider this force as the action of an action-reaction pair, what is the reaction force of this force m · g? a) The table pushes the object up b) The object pulls up to the ground c) The earth pushes up the table d)The object pushes the table down e)The table pushes down to the ground

Three identical 2.0 kg blocks are stacked on top of one another, three blocks tall.  They sit on the floor of a moving express elevator (it is accelerating down), and nothing else is touching them.  If the normal force of the floor on the bottom most block is of magnitude 54 N, what is the magnitude of the force on the top block due to the middle block? a) 16 N b) 17 N c) 18 N d) 19 N e) 20 N