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June 19, 2010 at 2:57 PM Worksheet on Mass Section A 1. A body at rest resists to change its state of rest. Which property of the body is responsible for this resistance? A. Weight C. Inertia B. Density D. Volume 2. Which of the following quantities is a measure of the inertia of a body? A. Mass C. Weight B. Speed D. Velocity 3. Which of the following has the greatest inertia? A. A boy is running the 100m race in 10s. B. A stationary car of mass 1500kg. C. A football is moving ata speed of of 10 m s^-1. D. A trolley of mass 2kg is moving down an incline plane. 4. Lorry P is empty and a similar lorry Q is fully loaded. Between P and Q, which one would accelerate more easily? Which would be easier to stop, if both are moving at the same speed? Easier to accelerate Easier to stop A. Lorry P Lorry Q B. Lorry Q Lorry P C. Lorry Q Lorry Q D. Lorry P Lorry P 5. A body that is moving resists changes to its motion. This resistance increases when A. the mass of the body increases B. the gravitational field strength increases C. the speed of the body increases D. the external force on the body increases Section B 1. (a) Define mass and state its SI unit. _____________________________________________ (b) State two instruments that can be used to measure mass. _____________________________________________ (c) Write down the name of the property of a body that resists a change in its state of rest or uniform motion. _____________________________________________ (d) How is the property in (c) above related to the mass of the body? _____________________________________________ 2. Evaluate the following statements about mass. Correct any false statements. (a) Mass of an object cannot be measured with a Newton meter. True/False _____________________________________________ (b) Mass of an object is equals to its weight. True/False _____________________________________________ (c) Mass is a vector quantity. True/False _____________________________________________ (d) Gravity affects the mass of a substance True/False _____________________________________________  3. The diagram shows two spheres, J and K, postioned at the edge of a slope. Both are given a small push so that they move over edge X and start to roll down the frictionless slope. J has a mass ten times that of K. Evaluate the following statements. Correct any false statements. (a) Inertia of sphere J is more than that of K. True / False ______________________________________________ (b) Sphere J picks up faster than K because it is heavier. True / False ______________________________________________ (c) Sphere K picks up faster than J because it has a smaller inertia. True/ False ______________________________________________ (d) Sphere J and K accelerate downward at the same rate because the slope is constant. True / False ______________________________________________ (e) Sphere J accelerates down the slope at ten times that of K due to its bigger inertia. True / False ______________________________________________ |