1. In order to describe the motion of an object, you need a fixed point also known as a ____________________________.
2. What are three ways that the velocity of an object can change?
3. What is the difference between speed and velocity?
4. Do all objects fall at the same rate on Earth? What affects the rate of acceleration on Earth that is not true on the Moon?
5. When a skydiver uses a parachute, what are they increasing to slow the rate of free fall?
6. The law that states that energy is not created or destroyed, it just changes form.
7. When the downward pull of gravity equals the upward force of air resistance, what is true for a falling object?
8. Why does a shot bullet hit the ground at the same time as a dropped bullet from the same height?
9. The ability to do work.
10. Stored energy found in food and fuels.
11. As an object falls toward Earth, it gains ______________ energy as it loses potential energy.
12. A car travels 100 miles in 2 hours. What is the average speed of the car?
13. A bicycle is stopped at the top of a hill. As the bicycle travels down the hill it reaches 10 meters/sec in 2 seconds. What is the rate of acceleration of the bicycle?
14. The straight-line length between a starting point and an ending point of motion.
15. What happens to the gravitational pull of an object as mass of the object increases?
16. What happens to the gravitational pull of an object if the mass stays the same but the volume is made smaller (increasing the density of an object)?
Sunday, March 17, 2013
Saturday, March 16, 2013
Practice Quiz Chapter 9 Answers
1. Reference Point
2. An object can speed up, slow down, or change direction.
3. Velocity is speed in a direction. Both are distance travelled in a given time but velocity is a vector quantity and you must describe direction.
4. Because the Earth is surrounded by an atmosphere, shape and size of an object will affect the rate of free fall. If an object is shaped to "catch more air" it will fall more slowly than an object that is aerodynamic. In an air-free environment like on the Moon, all objects fall at the same rate. On Earth, objects of similar shape should fall at the same rate too. So the marbles we dropped in class fell at the same rate even though they had different weights.
5. Air resistance or air friction.
6. Law of Conservation of Energy
7. It has reached terminal velocity.
8. Gravity is pulling on each bullet equally. The forward movement of the shot bullet is separate from the downward force of gravity.
9. Energy
10. Chemical potential energy.
11. Kinetic
12. 50 miles/hour
13. 5 meter/second 2
14. Displacement
15. As mass of an object increases, the gravitational pull of the object increases.
16. As density increases, gravitational pull increases (black hole).
2. An object can speed up, slow down, or change direction.
3. Velocity is speed in a direction. Both are distance travelled in a given time but velocity is a vector quantity and you must describe direction.
4. Because the Earth is surrounded by an atmosphere, shape and size of an object will affect the rate of free fall. If an object is shaped to "catch more air" it will fall more slowly than an object that is aerodynamic. In an air-free environment like on the Moon, all objects fall at the same rate. On Earth, objects of similar shape should fall at the same rate too. So the marbles we dropped in class fell at the same rate even though they had different weights.
5. Air resistance or air friction.
6. Law of Conservation of Energy
7. It has reached terminal velocity.
8. Gravity is pulling on each bullet equally. The forward movement of the shot bullet is separate from the downward force of gravity.
9. Energy
10. Chemical potential energy.
11. Kinetic
12. 50 miles/hour
13. 5 meter/second 2
14. Displacement
15. As mass of an object increases, the gravitational pull of the object increases.
16. As density increases, gravitational pull increases (black hole).
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