V.  - Dynamics Flash Cards Review

1. Find the a) horizontal and b) vertical components of the force c) calculate the acceleration of the sled

 a)

 

b)

 

c)

2. In the diagram below, a box is on a frictionless horizontal surface with forces F1 and F2 acting as shown.


If the magnitude of F1 is greater than the magnitude of F2, then the box is

(1) moving at constant speed in the direction of F1
(2) moving at constant speed in the direction of F2
(3) accelerating in the direction of F1
(4) accelerating in the direction of F2

 

 

 

3. Which pair of forces acting concurrently on an object will produce the resultant of a) greatest magnitude? b) smallest magnitude?


 

 a)

 

b)

 

4a) Find the Resultant (include direction)

4b) Find the Equilibrant (include direction)

 

 a)

 

b)

 

Dynamics Review

5. A 6 newton force and an 8 newton force act concurrently on a box located on a frictionless horizontal surface.

a) Find the Resultant force for 2nd, third, and fourth drawing to the left


b) Which box has the greatest acceleration

  

a)       

b)

 

 

6. Find the

a)  resultant of these two forces?

b) equilibrant?

 a)

 

b)

 

7. In the diagram below, a box is at rest on an inclined plane.

   

Which vector best represents the direction of the:
a) normal force ? b) weight force? c) friction?

 a)

 

b)

 

c)

8. The diagram below shows a block on a horizontal frictionless surface. A 100.-newton force acts on the block at an angle of 30.° above the horizontal.

What is the magnitude of force F if it establishes equilibrium?
 

(1) 50.0 N (3) 100. N (2) 86.6 N (4) 187 N

 

Dynamics Review

 

 

9. Find the acceleration for each example above (frictionless surface)

 

 

 1)

2)

3)

4)

10. The diagram below shows a 10.0-kilogram mass held at rest on a frictionless 30.0° incline by force F. What is the approximate magnitude of force F?

 

(1) 9.81 N (2) 49.1 N

(3) 85.0 N (4) 98.1 N

11. Find the acceleration for the example above (frictionless surface)

  • 12a) Compared to 8 kilograms of feathers, 6 kilograms of lead has

    (1) less mass and less inertia (2) less mass and more inertia
    (3) more mass and less inertia (4) more mass and more inertia

     

  • 12b) When the net force on a system is zero, the system is in equilibrium. velocity is ______ and a = ___

    •   

  • 12c)  The _____ of an object is the same on all planets

 12 a)

12 b)   

12 c)

Dynamics Review

  • 13a) ______ friction is a force that opposes motion

 

  • 13b) ______ friction is a force that opposes the motion of an object at rest

    •

13a)

13b)

14.  ______ is the gravitational force with which a planet attracts a mass. 14. 
15.  When one object exerts a force on a second, the second exerts a force on the first that is a) _______ in magnitude and b) _________ in direction.  

a)

b)

 
16. A mosquito flying over a highway strikes the windshield of a moving truck. Compared to the magnitude of the force of the truck on the mosquito during the collision, the magnitude of the
force of the mosquito on the truck is

(1) smaller (2) larger (3) the same 		 
17. When a satellite is a distance R from the center of Earth, the force due to gravity on the satellite is F. What is the force due to gravity on the satellite when its distance from the center of Earth is 3R?

(1) F/9 (2) F/3 (3) F (4) 9F