07.10: Contact forces are examples of which of the funux h4 qtmy2ub 8/)ir9ynh;9yfdamental forces?

  99.02: Which of the following termszpcsrpz ek8b2*z3-xj,3-j ua is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of 5udb r9dg(dq,a number of rubber stoppers andudrq,g 5b9dd( their resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, gnfpwbj3g rn8 55w h68and C, remain at rest on a table. The magnitude of t3jp5n n 8 gg5w6rfb8hwhe gravitational force on each block is indicated on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended 2e *kixq +rf flsb3-:pfrom a classroom ceiling by a series of strings as shown in the figure. Which string has the greatestexkr3f-s2qp+l i*f:b tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the maso gwemnif(+la)w v 2.5s M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents the tension in the string connectingw)nel( g5wmvo+ .fa i2 the masses?

  14.13: Which one of the following scientists is most associated,0s2 fb+ scp5 ih4xmutru0os) with the following statement: “Fsr t2 x0bc,omp5)+s0fusiu 4hor small displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in trzl75.ed euk3 ypbq1;he accompanying figure, a force F is exerted at an angle of zb15 7k;up.lr 3ydeeq$\theta$. 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 boudb9tr2n :*sn x along a rough horizontal floor at constant speed by means of a force P as ssntr29u* d :bnhown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four wn.+dku 6 2y-hfuy(miaays. In which case is the string most likelya(huy ikymun .6d-2f+ to break?

  96.39: Assume the objects in the following diagrams have equal mass and q.b2+ mjkme5q u3g-pfthe strings holding them in place are identicm qejgk.5 2b-m+ pq3ufal. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object uphzj3l26xnmw* 0z 1 shyward uniformly. Which one of the following choices must be true of the force F, provided by the person onto the object? W represents the magnitude of the gravwm2zl1xjnhh 0y 3*zs6 itational force acting on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the wua(z*nq 5u+fda t0q(x-axis, at one instant of time, the mass has a *5qnt+q a0 z(wduuf(position 2.0 m, velocity 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 the right on a rough surface bhgn3o(h3t g k;2r9sg by a horizontal force of 15 t sggo2b;93khn h3r(g N as shown, during the push, the 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 shy,9il)ju(w v h,dq .rpown in the figure to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic friction beqwi9p,,urj) d( vl.hy tween the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane inclined atse cc8 u2om bibb s95+;7k3kar 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 plate as sh/ ,n 1v9iwov zieh)/qgown in the diagram A.q 9 eo/ig,znw )h/viv1
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 thatjr .fntck6n3-g . mnr.amn 2b7 makes the angle θ with the horizontal. The block remains at rest as θ is slowly increased..j.mam7f c rn6n2.r3gnnb- kt The magnitudes of the normal force and the static frictional force of the incline on the block

  01.11: A 5 kg block rests on a flat plane inxvhw:zcr .9w62ts l 5sclined 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 (. mf:uvxz; n/xn ghpbsg.;)(qwhere friction is significant) in inclined at the same angle, it will bebsz vqx )u;.f;hngm: x n/.g(pgin 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 incli h +kjy2-jw5tpned plane has a gravitational force of 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 while the x-axis is parallel to the inclined surfapj jyh- wtk52+ce.

  15.13: An object is being p,)6x;ipsrkw8 *j jifpushed at constant speed on an inclined plane. The free body diagrpw8jf)pxri, i; ks6j*am of the object is shown with the gravitational 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 block of mass M=6.ozrl 65 dtl)l9pa:ha 9 /gp1iq0 kg with a constant speed of 5.0 m/s strag)95rd 9l 1la:qhzo/iaplt p 6ight up a flat 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 blo+m/s . gfuwkuq9)sl;eck of mass misplaced on an inclined plane of angle θ . When released, the block does not move. It is determined that the normal force acting from 9sl;). euq+ guwkmf/ sthe 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 o4/yhm250 vl mu(ug9c ubr(a sfrom rest at the top of 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 slidebm(mv(r5 9ayo lu0u2hsug /4c, what is the magnitude of the normal force from the table on the incline?