Question

1. A box is at rest on a flat table. Which of the following is true?

a. The normal force and the gravitational force are equal in magnitude and opposite in direction.

b. The magnitude of normal force depends on the coefficient of static friction between the book and the table.

c. Gravity exerts a force on the box that depends on how big the normal or support force is.

d. The normal force and the gravitational force are an action-reaction pair.

2. The mass of a a satellite in geostationary orbit is 1838 kg. The mass of Earth is 5.97*1024 kg. Because of the force Earth exerts on the satellite, it accelerates. The magnitude of the acceleration is 0.223 m/s2, and it is directed towards Earth.

What is the magnitude of the force in N the satellite exerts on Earth?

3. A person weighing 766 N stands in an elevator that decelerates at a rate of 1.4 m/s2 while moving downward.

What is the magnitude of the force in N exerted on the person by the floor of the elevator while it is decelerating?

Use g = 9.8 m/s2.

4. A person weighing 898 N stands in an elevator that decelerates at a rate of 1.7 m/s2 while moving upward.

What is the magnitude of the force in N exerted on the person by the floor of the elevator while it is decelerating?

Use g = 9.8 m/s2.

Answer 1