As we've discussed in class, the "normal force" or "perpendicular force" is just a name for the force a surface exerts on an object, in a direction perpendicular to the surface.  Suppose you are moving into a new apartment and have to drag a heavy box up a ramp that forms a 30 degree angle relative to the level ground. Which one of the following statements is true about the normal force between the box and the ramp? a. The normal force is less than the weight of the box b. The normal force is equal to the weight of the box c. The normal force is greater than the weight of the box d. The magnitude of the normal force depends on the coefficient of friction between the box and the ramp e. The magnitude of the normal force is zero

30. An object is acted upon by an applied force F and a normal force N due to a surface with coefficients of static and kinetic friction µ, and µk, respectively. Which of the following statements is ALWAYS TRUE? A. The frictional force is opposite in direction to F. B. The static frictional force is equal to µ,N. C. The kinetic frictional force is proportional to N. D. The kinetic frictional force is greater than the static frictional force.

Question 8

Figure 3 shows a 150 kg block on a ramp. If the force applied to the block initially at rest is 800 N and the coefficient of static friction is 0.20, determine the magnitude and direction of the friction force.

A 270-kg object and a 570-kg object are separated by 4.90 m. (a) Find the magnitude of the net gravitational force exerted by these objects on a 32.0-kg object placed midway between them. 1.323 × Draw a picture of the three objects, including the forces exerted on the third. N (b) At what position (other than an infinitely remote one) can the 32.0-kg object be placed so as to experience a net force of zero from the other two objects? 2.61 You appear to be assuming the answer will be a simple ratio of the masses. You must look very carefully at the equations before assuming a simple ratio holds. m from the 570 kg mass toward the 270 kg mass

Identify the correct answer and explain the answer Why is the answer choice chosen wrong?

A merry-go-round turns at a constant rate of 6 complete rotations per minute. What is its angular speed in radians per second? A. 6л rad/s B. π/10 rad/s С. π/5 rad/s D. 6.0 rad/s O A OB

Newton's first law states that: Group of answer choices Ia. n the absence of any net force acting on it, a mechanical system is necessarily at rest. b. In the absence of a non-zero net force acting on it, a mechanical system keeps moving in the same direction at the same speed (including the case v=0). c. For any pair A/B of objects interacting with one another, the force of A acting on B is the equal-opposite of the force of B acting on A. d. The rate of change of the velocity of a system is proportional to the net force acting on it.

EM The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force FSM that the sun exerts on the moon is perpendicular to the force F that the earth exerts on the moon. The masses are: mass of sun = 1.99 × 10³0 kg, mass of earth = 5.98 × 1024 kg, mass of moon = 7.35 × 1022 kg. The distances shown in the drawing are rSM = 1.50 x 10¹1 m and rem = 3.85 × 108 m Determine the magnitude of the net gravitational force on the moon. X Number Sun Units SM FSM FEM Earth Moon TEM