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# SPH4U: Lesson 5 Quiz (K:2, T:13, C:5)

1. Balint says, “Newton’s third law must be wrong. It states that forces always occur in equal and opposite pairs. These forces should always cancel each other, and nothing should ever experience a net force. Therefore, nothing should ever change its motion’’ Is he correct? Support your  argument  with an example. (C:3)

2. A bird with a mass of 1.20 kg sits in the middle of a stretched telephone wire, such that each half of the wire makes an angle of 10.0° with the horizontal.

a. Sketch an FBD of the situation. (C:2)

b. Determine the magnitude of the tension in the wire. (T:3)

3. Yua attached a kite with a mass of 325 g to a string and flew it in a strong easterly wind. The string made an angle of 60.0° with the horizontal and exerted a force of 2.75N on the kite. The kite accelerated upward at 1.20 m/s2. Determine the force exerted by the wind on the kite. (K:2, T:2)

4. A mass, m1 of 250 g is on a table connected to mass m2 with a massless string over a frictionless pulley, as shown in Figure 1. The coefficient of friction between m1 and the table is 0.228. What is the maximum value of  m2 before m1 starts sliding across the table? (T:5)

5. A box with a mass of 10.0 kg is placed on a hill that inclines upward at an angle of 30.0°. The coefficient of static friction between the box and the hill is 0.582, while the coefficient of kinetic friction is 0.528. If the box is given an initial  push to start it moving down the hill, will it continue moving down the hill when the initial force is removed, or will it coast to a stop? Explain your reasoning (T: 3) 