Download U3 WKS 4 Name___________________Pd

U3 WS 5 - Static Equilibrium
Name___________________Pd___
0. Review Questions
A. How many kg is 43 grams?
B. How many meters is 43 cm?
C. What is the meaning of the slope of a weight vs. mass graph? What are the units of this slope?
D. What is the meaning of the slope of a velocity vs. time graph? What are the units?
E. For an object in free fall, how does the acceleration on the way up compare to the acceleration on the
way down?
F. Draw the force diagram for an object in free fall.
G. What is the value, symbol and units for the gravitational field strength on earth?
H. Can you have mass without weight? Can you have weight without mass? Explain.
1. For the picture on the right, the left cable (S1) exerts a 200 N force.
A. Use force diagrams and net force equations to determine the weight
of the ball (it is in equilibrium).
S1
  37
B. What is the force of tension in cable S2?
?
2. Suppose the jeans hung out to dry on the clotheslines below have a weight (Fg) of 20 N.
A. Construct a force diagram and write net force equations for each clothesline.
Σ Fx =
Σ FY =
B. Determine the Tension forces exerted by the ropes in each clothesline.
C. Which line is more likely to break? Why?
Σ Fx =
Σ FY =
3. The hanging ball has a weight of 8 N and is supported at rest as shown.
rope.
Calculate the tension force in each
T2
30°
4. A man pulls a box that weighs 500 N at constant speed across the
floor. He applies a 200 N force along a length of rope 1.2 m long.
A. Draw a force diagram for the box.
B. What is the value of the frictional force on the box? ________________
C. What is the value of the force of gravity on the box (its weight?)______________
D. How does the value of the normal force compare to the weight of the box? ______________
5. The box on the 3-meter-long frictionless ramp is held at rest by the tension force. The box weighs 100 N.
A. Draw a force diagram. Include components.
B. Use your force diagram and the angle of the ramp to determine what the
force of tension must be.
Ft
35°
Ft = ________________
6. For the same box as in the last problem, what would be the value of the tension
force if the angle were increased to 70°? (Draw a force diagram).