Which statement correctly defines force?, The amount of matter in an object, The space occupied by an object, A push or a pull, The rate of movement of an object, Which of the following is an effect of force on an object?, Changing its atomic number, Changing its chemical element, Changing its state of motion, Changing the amount of matter permanently, A student pushes a stationary trolley and the trolley begins to move. What effect of force is shown?, Changing the state of motion, Changing the direction only, Changing its mass, Changing its temperature only, Which force acts vertically downwards on an object near Earth's surface?, Elastic force, Frictional force, Gravitational force, Buoyant force, A box is pushed to the right across a rough floor. In which direction does frictional force act on the box?, Vertically upward, To the left, Vertically downward, To the right, Which method reduces friction between moving metal surface?, Adding a lubricant, Making the surface rougher, Increasing the load, Increasing the contact force, Why are the soles of sports shoes designed with pattern or grooves?, To increase friction with the ground, To eliminate gravitational force, To reduce the mass of athlete, To increase buoyant force, An object floats in water when the buoyant force is equal to its weight. What can be concluded?, The object must be denser than water, The object has no gravitational force, The object has no mass, The forces acting on the object are balanced, Two objects have the same volume. Object P has a greater mass than Object Q. Which object has the greater density?, Neither has density, Object P, Object Q, Both have the same density, A metal block sinks in water. Which statement best explains this onservation?, Its density is lower than the density of water, Its mass is zero, Its density is greater than the density of water, It experience no gravitational force, A door is easier to open when a force is applied farther from the hinge. Why?, The gravitational force dissappears, The moment of force is greater, The frictional force becomes zero, The mass of the door becomes smaller, Which arrangement produces the greatest turning effect about a pivot when the same force is used?, Force applied far from the pivot, Force applied close to the pivot, No force applied, Force applied directly at the pivot, Which equation is used to calculate pressure, Pressure = Force ÷ Area, Pressure = Force x Area, Pressure = Mass x Area, Pressure = Area ÷ Force, A force of 200N acts on an area of 0.5 m2. What pressure is produced?, 500 Pa, 200Pa, 100 Pa, 400 Pa, Why does a sharp needle penetrate fabric more easily than a blunt needle when the same force is applied?, It has no gravitational force, It produces greater pressure because its tip has a smaller area, It produces less pressure because its tip is smaller, It has a greater volume only, A student carries a school bag using a wide shoulder strap instead of a narrow strap. Why is the wide strap more comfortable?, It decreases the pressure on the shoulder, It removes the weight of the bag, It increases the mass of the bag, It increases the pressure on the shoulder, Why does liquid pressure increase as depth increases?, The container becomes lighter, There is a greater column of liquid above the point, The liquid stops exerting force, The liquid becomes weightless, A dam wall is made thicker at the bottom than at the top. Which reason best explains this design?, Atmospheric pressure disappears underwater, Water has no weight at the bottom, Liquid pressure is zero at the bottom, Liquid pressure is greater at greater depth, A suction cup stinks to a smooth wall because of a difference in pressure. Which pressure is greater on the outside of the suction cup?, Atmospheric pressure, Liquid pressure inside the cup, Pressure inside the suction cup, No pressure acts outside the cup, A student wants to reduce the pressure exerted by a heavy object on the floor without changing its weight. What should the student do?, Remove the contact surface, Increase the weight, Decrease the contact area, Increase the contact area

Chapter 8: Force & Motion

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