Physics( Revision worksheet)
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1 Physics( Revision worksheet) 1.What is true of an object that is in free fall? A. No forces are acting on it. B. Only the force of gravity is accelerating it. C. The forces of thrust and gravity balance one another. D. The forces of air resistance and gravity balance one another. 2. The following picture shows forces acting on a sneaker. If the sneaker remains motionless, which statement is true? A. F and F friction have equal strength. B. F friction has greater strength than F. C. F, F friction, F gravity, and F table all have exactly the same strength. D. F table and F friction have the same strength, and F and F gravity have the same strength. 3. student submerges a cube in a container of water. How can the student determine the buoyant force on the cube? A. Determine the mass of the cube. B. Calculate the volume of the cube. C. Measure the weight of the water displaced by the cube. D. Subtract the density of water from the density of the cube. 4. Which of the following is an example of an acceleration vector? A. 5 m/s B. 5 m/s 2 C. 5 m/s 2 south D. 5 m/s south
2 5. Katrina rode her bicycle to the library. The following graph shows part of Katrina s ride after she started. What was Katrina s acceleration during the time represented on the graph? A. The acceleration was zero. B. The acceleration was 10 m/s. C. The acceleration was 10 m/s 2. D. The acceleration was 3.3 m/s A student attaches an object to the end of a spring scale and lowers the object into a container of water as shown below. What can the student learn about the object by measuring the weight of the water that spills into the smaller container? A. the weight of the object B. the density of the object C. the thermal energy of the object D. the buoyant force on the object.7. An airplane leaves New York to fly to Los Angeles. It travels 3,850 km in 5.5 hours. What is the average speed of the airplane? A. 700 km C. 700 km/hour B. 700 hours D. 700 hours/km
3 8. The law of universal gravitation says all bodies attract each other. If you drop a cup, it falls to Earth. Why doesn t the gravitational attraction between your hand and the cup keep the cup from falling? A. The law of universal gravitation only applies to planets in space. B. There is a gravitational attraction between you and the cup, but Earth s gravity is stronger, so Earth s gravity pulls the cup down. C. The gravitational attraction between you and the cup is so strong that the force pushes the cup down. D. There is no gravitational attraction between you and the cup, so Earth s gravity pulls the cup down. 9.Fill in each blank with the term that best completes the following sentences. 1. The of an object describes the speed and the direction in which it is going. 2. The change in the velocity of an object is defined as its. 3. An object that is traveling around another body in space is in around that body. 4. The on an object is the combination of all the forces acting on the object. 5. The is the upward force that fluids exert on all matter. An experimenter records data for the speed and time of rolling carts traveling along a track. The table shows the data for four trials. Trial 1 Trial 2 Trial 3 Trial 4 Time (s) Speed (m/s) Speed (m/s) Speed (m/s) Speed (m/s) In which trial did the cart experience the greatest average acceleration? A. trial 1 B. trial 2 C. trial 3 D. trial 4 3. Montez read that bobcats can reach speeds of up to 30 mi/h. What does the speed of a bobcat indicate? A. the time it takes to reach its maximum speed
4 B. the total amount of time it travels in one direction C. the distance it travels to move between two points D. the distance it can travel in a certain amount of time 10. Which is an example of centripetal acceleration? A. an object at rest B. an object moving in a circle at 20 m/s C. an object moving at 20 m/s backward, then 20 m/s to the right D. an object moving in a straight line at a steady speed of 20 m/s forward 11. Melanie watched the path a baseball followed after a pitcher threw it. She noticed that the ball traveled horizontally away from the pitcher, as well as downward toward the ground. What force caused the ball to accelerate in the downward direction when it was thrown? A. applied force B. air resistance C. electrical force D. gravitational force 12. Why is the magnetic force considered to be an action-at-a-distance force? A. Magnets must be far apart in order to exert a force. B. Magnets do not have to touch each other to experience a force. C. Magnets push each other apart to increase the distance between them. D. Magnets must be large in size in order to exert a force that is strong enough to notice. 10.State and explain 2 nd law of motion with example
5 Which statement about fluid pressure is true? A. Areas of low pressure spin around regions of high pressure. B. Areas of low pressure are warmer than areas of high pressure. C. Fluids move from areas of low pressure to areas of high pressure. D. Fluids move from areas of high pressure to areas of low pressure. 8. The dotted lines in the following picture show orbital paths of objects. Which object orbits object E? A. object A B. object B C. object C D. object D 9. Why does a helium-filled balloon expand as it rises into the atmosphere? A. Helium particles become larger as they rise. B. Atmospheric pressure decreases with altitude. C. Air becomes more dense higher in the atmosphere. D. The pressure of the gas inside the balloon increases as it rises.
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WHICH OF THE FOLLOWING IS AN EXAMPLE OF A CONTACT FORCE? A. ELECTRICAL FORCE B. APPLIED FORCE C. GRAVITATIONAL FORCE D.
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