<p> Kevin Houlihan 02/03/15</p><p>SI Session 7 Concept Quiz: Forces</p><p>1. A 1000-kg box is pulled along a rough surface at a constant velocity of 10 m/s. Which of the following is correct?</p><p> a. The pulling force is higher than the frictional force</p><p> b. The pulling force is equal to the frictional force</p><p> c. The pulling force is lower than the frictional force</p><p>2. A 10-kg and 20-kg stationary balls are made to roll at the same velocity. Which of the following requires a bigger force to move?</p><p> a. the 10-kg ball</p><p> b. the 20-kg ball</p><p> c. the force is equal for both balls</p><p>3. When a car stops suddenly, you lurch forward. What is the direction of the force that acts on you?</p><p> a. a forward force</p><p> b. a backward force</p><p> c. no force</p><p>4. A 50-kg boy collides with a 80-kg man. Which exerts a bigger force upon impact?</p><p> a. The 50-kg boy</p><p> b. The 80-kg man</p><p> c. Neither, they both exert the same amount of force</p><p>A Net Force F acts on an object.</p><p>5. This means that</p><p> a. the object must be moving in the direction of F.</p><p> b. the object may be moving in any direction.</p><p>6. This also means that</p><p> a. the object must be accelerating in the direction of F. Kevin Houlihan 02/03/15</p><p> b. the object could be accelerating in any direction.</p><p>7. Consider a person standing in an elevator that is accelerating downward. The magnitude of the upward normal force exerted by the elevator floor on the person is</p><p> a. larger than</p><p> b. smaller than</p><p> c. equal to</p><p> the magnitude of the weight of the person.</p><p>8. A small sports car collides head-on with a massive truck.Which vehicle experiences the greater magnitude force during the collision?</p><p> a. The car.</p><p> b. The truck.</p><p> c. The answer depends on the speeds the vehicles were moving.</p><p> d. Both experience the same force during the collision.</p><p>9. Which vehicle experiences the greater magnitude acceleration during the collision?</p><p> a. The car.</p><p> b. The truck.</p><p> c. The answer depends on the speeds the vehicles were moving.</p><p> d. Both experience the same acceleration during the collision.</p><p>10. A box is sliding down a ramp. It is accelerating. What would be the Free Body Diagram of the forces on the box?</p><p>1 A 2 B Kevin Houlihan 02/03/15</p><p>3 C 4 D</p><p>11. A mass, m, is pushed with a horizontal force, F, on a horizontal surface. The coefficient of static friction is μs. The block does not move. The magnitude of the static friction force on the mass is</p><p> a. Μsmg</p><p> b. μsF</p><p> c. F</p><p> d. mg</p>