At which point on the lever should Gina put the box if she wants to use half as much force to lift it? Point A. Point B. Point C.
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1 HIS Interim ssessment Science Grade 7 Learning Focus: 1.2 Student ate 1 Gina has a long day of moving ahead of her and she wants to save her energy. She would normally need to apply a force of 30 Newtons to lift a box, but instead uses a lever system to make her work easier. t which point on the lever should Gina put the box if she wants to use half as much force to lift it? Point Point Point Point Page 1
2 2 Use your knowledge of science and the diagram to answer the question. Office uilding Fuel Use Gallons of Fuel Oil Used per ay verage Outside Temperature in F Which is the best conclusion that can be made from the graph above? s the temperature gets warmer, more fuel oil is used. People who heat with fuel keep their offices very warm in the winter. s the temperature gets warmer, less fuel oil is used. When it is very cold, fuel oil becomes more expensive. Page 2
3 3 The illustration shows a runner rounding a turn on a running path. The runner leans inward while traveling around a curve. This action allows the runner to. use force to help change direction introduce a force to overcome gravity balance all the forces acting on him resist the force trying to change his direction Page 3
4 4 Use your knowledge of science and the diagram to answer the question. Jeff s model plane will not fly straight. To make it fly straight, which design change listed below would be most effective for helping Jeff s plane fly straight? rrange the flaps in the same direction. dd a paper clip to the nose of the plane. Tape the wings together with light adhesive. olor the edges of the folds in the model. 5 Use your knowledge of science and the diagram to answer the question. The picture shows a crowbar being used to remove a nail from a piece of wood. The arrows with numbers show the directions in which force can be applied to the crowbar. In which direction should force be applied in order to remove the nail from the board? direction 1 2 direction direction 3 direction 4 rowbar 4 Nail Page 4
5 6 Use your knowledge of science and the diagram to answer the question. Flat board track Track with rollers The two diagrams above illustrate ways of loading a box into a truck. The person using the track with the rollers uses less energy to load the box because the rollers reduce the. mass of the box distance traveled by the box force of gravity force of friction Page 5
6 7 Use your knowledge of science to answer the question. Shaun's family is moving from ustin to Houston during the fall semester. For their move, the family has hired a moving company to transport their belongings. Shaun noticed the movers using a ramp to load boxes onto the truck. The advantage of the ramp was most likely to reduce the. force needed to raise the boxes by increasing the distance the box is moved time needed to raise the boxes by reducing the distance the box is moved work needed to raise the boxes by increasing the distance the box is moved height needed to raise the boxes by reducing the distance the box is moved Page 6
7 8 The graph below shows the United States population and the total water usage in the United States from 1950 to United States Total Water Use Water Use (billions of gallons per day) Population (millions) Year ased on the graph displayed, which statement is a fact? People used a greater amount of water between 1970 and People have been finding better ways to use water since The average number of people who used water decreased after The average number of gallons each person used was lower in 1995 than in Page 7
8 9 The diagram shows two dogs pulling on a rope with constant but unequal forces. In which compass direction will both dogs most likely move? east west north south E SURE YOU HVE REORE LL OF YOUR NSWERS ON THE NSWER OUMENT Page 8
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