Force and Motion II

Question 1:What is the meaning of elasticity? Answer:Elasticity is the property of material that enables an object to return to its original shape and size when the force applied on it is removed. Question 2:Figure 1.43 shows the graph of force, F against extension, x for a spring.(a) State Hooke’s law.(b) Does the spring obey … Read more

Question 1:State the meaning of forces in equilibrium. Answer:An object is said to be in equilibrium of forces when the forces acting on it produces a zero resultant force.Keywords:– forces acting– zero resultant force Question 2:Figure 1.31 shows a block that is stationary on an inclined plane when a stopping force, P is applied horizontally.(a) … Read more

Question 1:Resolve the following forces into horizontal component and vertical component. Answer:(a)$$ \begin{aligned} & F_x \equiv 70 \cos 42^{\circ} \\ & F_x \equiv 52.02 \mathrm{~N} \end{aligned} $$$$ \begin{aligned} & F_y=70 \sin 42^{\circ} \\ & F_y=46.84 \mathrm{~N} \end{aligned} $$(b)$$ \begin{aligned} F_x & =90 \cos 64^{\circ} \\ F_x & \equiv 39.45 \mathrm{~N} \end{aligned} $$$$ \begin{aligned} & E_y … Read more

Question 1:Determine the magnitude and direction of the resultant force in the following situations.Answer:(a) Resultant force(b) Resultant force Question 2:Figure 1.12 shows the forces acting on a ball that is kicked simultaneously by two players.(a) Sketch a diagram that shows the 240 N force, the 180 N force and the resultant force.(b) Calculate the magnitude … Read more

Question 3:Figure 1.44 shows an arrangement consisting of three identical springs P, Q and R. The spring constant is 4 N cm–1. The arrangement is compressed by an 8 N force. Determine:(a) the force experienced by each spring (b) the compression of each spring (c) the compression of the system of springs Answer:(a)Spring P = … Read more