A 10-kg box sitting on a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the object?
0.20 m/s².
0.50 m/s².
5.0 m/s².
0.30 m/s².
A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 370 above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?
3.3 m/s².
2.0 m/s².
1.9 m/s².
1.5 m/s².
Which of the following statements is correct according to Newton's first law of motion?
If an object at rest is acted upon by a force, it must move.
An object in motion eventually comes to a halt.
An object at rest remains at rest unless acted upon by a net force.
An object in motion moves in a parabolic trajectory unless acted upon by a net force.
