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Physics-Chapter 1
Laws of Motion
Question | Answer |
---|---|
What is force? | a push or a pull measured in Newtons. F=ma. 1N= 1kg*m/s(squared). |
What is inertia? | the tendency of an object to resist a change in motion. |
What is static friction? | the force acting on objects that are not moving. it must be overcome to begin moving an object. |
What is sliding friction? | occurs when solid surfaces slide over each other. It occurs after overcoming static friction. |
What is fluid friction? | it occurs when an object moves through a fluid (air, water). |
What is a balanced force? | a force that doesn't change the motion of an object. Net forces=0 (zero) |
What is an unbalanced force? | a force that does change the motion of an object. Net forces do not equal zero. |
What is a force pair? | the force that two objects apply to each other. Action and reaction. |
What is momentum? What is the Law of Conservation of Momentum? | The Law of Conservation of Momentum states,"the total momentum of a group of objects remains the same unless outside forces act upon the objects." In other words, the total momentum is the same before and after the crash. |
For every action there is an equal or opposite reaction. Name the Law. | Newton's 3rd Law |
An object will remain at rest unless a net force acts upon it. Name the Law. | Newton's 1st Law |
Force=(mass)(acceleration). Name the Law. | Newton's 2nd Law |
A baseball sticks in the catcher's glove until an unbalanced force acts to move it. Name the Law. | Newton's 1st Law |
As the force of a golf swing is increased, the ball's acceleration is increased. Name the law. | Newton's 2nd Law |
As you walk, your foot pushes the ground backward, and the ground propels you forward. Name the law. | Newton's 3rd Law |
A race car gains acceleration as its mass increases. Name the law. | Newton's 2nd Law |
A boat moves back when people dive off the side of it. Name the Law. | Newton's 3rd Law |
The passengers lean sideways as the train takes a sharp turn. Name the Law. | Newton's 1st Law |
When a rock falls into the lake, the water splashes up. Name the Law. | Newton's 3rd Law |
The speed of a pall pitched by a child is slower than that pitched by an adult. Name the Law. | Newton's 2nd Law |
Your parked bicycle has ________ friction until you are able to push the pedals and get moving. | Sliding Friction |
What is the gravitational force on any object near Earth's surface? | 9.8 m/s/s |
Gravitational force is measured by what two factors? | Mass and distance |
_______ is the force that will oppose any body or object in motion. | Friction |
When a force acts on an object in the SAME DIRECTION of the motion of the object, the object will _______. | Speed up |
When a force acts on an object in the OPPOSITE DIRECTION of the motion of an object, the object will _______. | Slow down |
Astronauts weigh less in space than here on earth because ____________________________. | They are farther away from the earth's gravity |
You hit a table with a fly swatter, describe the reaction force. | the table pushes back on the fly swatter |
A semi truck collides with a Honda Civic. Compare the total momentum of the vehicles before the crash to the total momentum after the crash. | The total momentum stays the same. |
What happens when a large marble collides with a small marble? | They both continue in the same direction in which the large marble started and the large marble sticks to the smaller marble. |
How does a lubricant work to reduce friction? | There is less surface rubbing since the lubricant fills the microscopic bumps and ridges. |