07.10: Contact forces are examples of which of the fundamental forces?+q n+4nb3nn p+wxk)g p*n3iqm

  99.02: Which of the following terms is1 9sj:nkd. /0jc ylm1sxbrn4p NOT related conceptually to the others?

  02.20: The graph shows the rel0g3z8 w.ev5sphkkd / aationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. Tha5wkvdgp80k /.sh e3ze slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. The magnih p+omy: leu;w(dzk+1 tude of the gravitational force on each block is indicated on the figure. 1k( eo:mduhl;p+zy+w What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceilingr*yy)o d w nc+-lp8yk; by a series of stringol y*yr)-dn 8+p cwyk;s as shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。are stc a(31xet/3 z-.lrggavnpd3aationary. The mass M rests on the floor. Which one of the following choices e3gav(3a/az.ntc x rl-31p dg represents the tension in the string connecting the masses?

  14.13: Which one of wxi6hl3g2d f a1 2lg:; sio0tjthe following scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restwx1 it2dfij;0h:ogag2 3ls 6 loring force that is proportional to the displacement.”?

  94.26: As shown in ta;9rz xdnn:4/dnz2 )9sc3arayk s ;dkhe accompanying figure, a force F is exerted at an angle of dn/d9dnsny 4z;kc zkx9ra 3;s2 :a)ar $\theta$. The block of weight mg is initially moving the right with speed $v$. The coefficient of friction between the rough floor and the block is $\mu$. The frictional force acting on the block is:

  95.34: A student pulls a wooden box al9a idd4 -la;szong a rough horizontal floor at constant speed by means of a force P as shown to the right. z-4l9ds aida; Which of the following must be true?

  99.08: A weight can be hung in any of th (xrs*lp9+gqeaeh * i5e following four ways. In which case is the string most likely t+eq5xhs ir ap(e*g9*l o break?

  96.39: Assume the objects in r.)g8* fxce+x+wpu5rml xv ;xthe following diagrams have equal mass and the strings holding them in place are identig 8+xr5.uxwm fp;xvrl x* c+e)cal. In which case would the string be most likely to break?

  16.10: A person wishes to accelerateezb/q4vnsp.2g 84 d ck an object upward uniformly. Which one of the following choices must be true of the force F, provided by the person onto the object? W reprz/g 2q8n4kpdsvc4b .eesents the magnitude of the gravitational force acting on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass y1wtft5im8 5njcq) u99dgty,:b j gq+moves along the x-axis, at one instant of time, the mass has position 2.0 m, v:8tjq9tg,ybnftw5y jgqu 51+)cm9 i delocity 3.0 m/s,and acceleration $4.0\;m/s^{2}$ . What is the net force acting on the mass at this instant of time?

  11.15: A 4.0 kg object is pushed to tb7cz,3pv t2u j2e-n5ntlmn z6he right on a rough surface by a horizontal force of 15 N as shown, during the push, 7 jnc neb2ztnu6p 5v3m,t-2zlthe object accelerates uniformly to the right at 2.5 $m/s^{2}$ . What must be the magnitude of the force of friction also acting on the object during the push?

  96.32: The 10.0 kg box shown in the figure to the right **lupi,pyiy:is sliding to the right along the floor. A horizontal force of 10.0 N is being app*yp:iy u ip,*llied to the right. The coefficient of kinetic friction between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a fk.x*v1 ycu:fg lat plane inclined at an angle of $30^{\circ}$ with respect to the horizontal. What is the minimum coefficient of friction necessary to keep the block from sliding?

  99.32: A wooden box is first pulled across a horizontal steel plat9o1 cn fk lx6opinqnlji:733*e as shown in the diagram 6 no qn*79iilo:3kpx1jcl3nf A.
The box is then pulled across the same steel plate while the plate is inclined as shown in diagram B. How does the force required to overcome friction in the inclined
case (B) compare to the horizontal case (A)?

  07.09: A block rests on an incline that makes the angle θ with the hy3 fes-ovftj5 nz+9/iorizontal. The block remains at rest as θ is slowly increased. Theino+ey/vffst 5 jz9 -3 magnitudes of the normal force and the static frictional force of the incline on the block

  01.11: A 5 kg block rests onn6: q/y,oll 5ms icmi4 a flat plane inclined at an angle of $30^{\circ}$ to the horizon as shown in the diagram below.

What would be the acceleration of the block down the plane assuming the force of friction is negligible?

  01.12: If the block is placed on a second plane (whed3a gx1cm 7qw/;k.vaore friction is significant) in inclined at the same angle, ;qv o17mw3/dc.kgax ait will begin to accelerate at 2.0 m/s. What is the force of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force 1bje;9y w rri87quh3bof magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the coordinate axes shown in the figure? The y-axis is perpendicular to the incline’s surface while9ybqibreruh;78 w1j3 the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at constant speed on an inclined pl2-0werf bl tyh3cp: ppc.8tw;ane. The free body diagram of the object is shown with the gravitationa2w. tbpy cf3t rp 8l0peh;wc-:l force represented by W, the friction force by f, the applied external push parallel to the incline by F, and the normal force with the surface by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes a bl*yfwvv -0 ggm-16wnl kock of mass M=6.0 kg with a constant speed of 5.0 m/s straight up a mgfvk vl* 1wwg 0--6nyflat surface inclined $30^{\circ}$above the horizontal. The coefficient of kinetic friction between the block and the surface is μ = 0.40. What is the net force acting on the block?

  14.20: A uniform block of mass misplaced on an inclined plane oaqj hfb7 o/nm+11 low3f angle θ . When releasea+w73l m h1nbfjo1q/ od, the block does not move. It is determined that the normal force acting from the incline on the block has a magnitude of 62 N while the force of static friction acting on the block has a magnitude of 38 N. The coefficient of static friction between the block and inclined plane is 0.92. Which one of the following choices best represents the mass,m, of the block?

  17.40: A small object of mass M is released from rest at the top ouf /v .l9xh fq2hl.:lpf a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a table as thesmall object slides. During the slide, what is the magnitude of the normal force from thv.f.9qh h2lf:l/xu lp e table on the incline?