A book is lying on a table. According to Newton’s First Law, why does the book remain at rest unless acted upon by a force? What forces are acting on the book? (University Physics 1: Kinematics & Dynamics)

A passenger is standing on a scale in an elevator. The building has a height of 500 feet, the passenger has a mass of 80 kg, and the scale has a mass of 7 kg. The scale sits on the oor of the elevator. You may take g = 10 N/kg. While it is accelerating downwards hat does the scale read (in newtons

A 80 kg woman on roller skates pushes a 30 kg girl, also on roller skates, with a force of 100 N. The magnitude of the force exerted by the girl on the woman is O 200 N O 100 N O 50 N O 40 N O 38 N zero

A 1200 kg speedboat is travelling East at a constant speed of 30 m/s. A 50 kg rowboat is travelling West at a constant speed of 5 m/s. Which boat has the greater net force on it? Explain using physical reasoning.

An SUV containing 5 passengers has a mass of 3500 kg. It has a driving force of 2500 N directed west on a perfectly horizontal road. The surface of the road exerts a resistive force of 500 N due east. At the same time, a strong wind is blowing a force of 500 N due east in the opposite direction of the car's drive force. Does the car have any acceleration? If yes, then what is the magnitude and direction of the car's acceleration?

A 74.1-kg crate is suspended between the floor and the ceiling using two spring scales, one attached to the ceiling and one to the floor. If the lower scale reads 120 N, what is the reading of the upper scale? Ignore the weights of the scales.

A force F  applied to an object of mass m1 produces an acceleration of 3.70 m/s2. The same force applied to a second object of mass m2 produces an acceleration of 2.00 m/s2. (a) What is the value of the ratio m1/m2? (b) If m1 and m2 are combined into one object, find its acceleration under the action of the force F

Two friends push a sled on snow in opposite directions. One pushes with a force of 190 N, and the other pushes with a force of 130 N. The sled does not move. What is the net force on the sled?       (a) 320 N         (b) 60 N       (c) zero           (d) cannot be determined

A "doomsday" asteroid with a mass of 1.0 × 1010 kg is hurtling through space. Unless the asteroid's speed is changed by about 0.25 cm/s, it will collide with Earth and cause tremendous damage. Researchers suggest that a small "space tug" sent to the asteroid's surface could exert a gentle constant force of 2.4 N . For how long must this force act?

Consider the following statement: “The normal force on an object is always equal to the weight of the object.”Select all the reasons that this statement is false .       The normal force is not always parallel to the force of gravity     The normal force is independent of the force of gravity     The normal force is only equal to the weight of the object when sitting on a horizontal surface and there are no other forces in the y-direction except gravity     The normal force causes an acceleration and therefore does not interact with gravity