Two toy trucks travelling at different constant speeds are about to collide. The two identical trucks are traveling in opposite directions, and truck A is carrying a heavy load.

During the collision, will the magnitude of the force exerted on truck A by truck B be _____ the magnitude of the force exerted on truck B by truck A?

 

  1. greater than
  2. less than
  3. equal to

Which pairs of forces in the free body diagram shown could be interaction force pairs?

 

  1. A and D
  2. A and E
  3. B and E
  4. C and F
  5. F and G
  6. None of these

A 10 kg box is atop a 5 kg box and both are in an elevator. If the elevator starts from rest and accelerates upwards to a speed of 2.0 m/s in 1.5 s, what was the magnitude of the acceleration of the top block in m/s2?

Match the FBD below with the appropriate system, top box, bottom box, or the top plus bottom box system.

 

 

 

 

What is the magnitude of the normal force from the bottom box on the top box?

 

 

 

 

 

What is the magnitude of the normal force from the elevator on the bottom box?

The diagram shows two blocks (on a frictionless horizontal surface) with two external forces acting, one on each block as shown.

 

Compared to the net force on the smaller block, the net force on the larger block is _____

 

  1. equal in magnitude & opposite in direction.
  2. equal in magnitude & in the same direction.
  3. larger in magnitude & opposite in direction.
  4. larger in magnitude & in the same direction.
  5. smaller in magnitude & opposite in direction.
  6. smaller in magnitude & in the same direction.
  7. zero, since both net forces vanish & have no direction.

 

A box is on a horizontal frictionless table and is attached via a string and pulley to a another mass M that is hanging off the end of the table.

The tension in the cable is ___________

greater than Mg

less than Mg

equal to Mg

Rank the following situations, greatest to least, based on the tension in the string. Assume the hanging mass in each case is the same, friction is negligible, and the pulley and the rope are massless.

Which of the following are constraints on mass 1 and mass 2?

 

  1. |a1|= |a2|
  2. |a1|= 2 |a2|
  3. |v1|= |v2| 
  4. |v1|= 2 |v2|

 

The box of mass m is suspended above the floor of an elevator with the aid of some mass-less, friction-less pulleys. The elevator is moving in the upward direction and slowing down.

 

Which of the of the following are true regarding the tension in the cable?

 

  1. greater than mg
  2. equal to mg
  3. greater than mg/2 and less than mg
  4. equal to mg/2
  5. greater than mg/4 and less than mg/2
  6. equal to mg/4
  7. less than mg/4