Download Chapter 5 Review

Chapter 5 Review Problems
Physics
1.) Consider the following forces:
40 N
15 N
125
50
-35
20 N
a.) What are the x and y components for the 20 N force?
b.) What are the x and y components for the 40 N force?
c.) What are the x and y components for the 15 N force?
d.) What is the net force for the x direction?
e.) What is the net force for the y direction?
f.) What is the magnitude (value) of the resultant force, and in what
direction does it act with respect to the positive x-direction?
2.) Marcia exerts a 25 Newton force as she pushes a 7 kg end-table across the
floor at a constant velocity. What is the coefficient of kinetic friction
between the floor and the end-table?
3.) What is the component of weight parallel and perpendicular to the surface?
70 kg
25
4.) A 1.25 kg box is being pulled across a level surface where  k is 0.80. If the
string is suddenly cut, causing the applied force to immediately go to 0.0 N,
what is the acceleration of the block?
5.) If the velocity of the box in problem 4 was 5.0 m/s at time zero, what will
be its speed after 0.50 s? How far will it travel in that time interval?
6.) A 0.17 kg hockey puck leaves the stick on a slap shot traveling 21 m/s. If
no other forces act on the puck, friction eventually will bring it to rest 62 m
away.
a.) Based on these data, determine the value of  k for this hockey puck on
ice.
b.) Will the answer change if a puck of different mass, but same material
and shape is used?
7.) A 105 N suitcase sits on a rubber ramp at an airport carousel at a 250 angle.
The weight vector can be broken into two perpendicular components.
105 N
Fx
θ
θ
Fy
a.) What is the magnitude of the component of weight parallel to the ramp
surface?
b.) What is the magnitude of the component at a right angle to the ramp
surface?
c.) Which of those components is the normal force?
8.) In problem 7.), which force offsets the kinetic friction force?
If Fx exceeds Ff will the suitcase accelerate down the ramp?
9.) Jonathan, with a mass of 81 kg, starts at rest from the top of a water slide
angled at 420 from the ground. He exits at the bottom 3.0 s later going 14
m/s. what is  k ?
10.) A 64 N box is pulled by a rope at a constant speed across a rough
horizontal surface. If the coefficient of kinetic friction is 0.81, what is the
magnitude of the applied force if that force is directed parallel to the floor?