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Ch 5 terms
ch 5 terms
| Question | Answer |
|---|---|
| Motion | When an object changes position over time when compared to a reference point the object is in |
| Speed | The rate at which an object moves. |
| Average Speed Formula | Total distance / total time |
| Velocity | The speed of an object in a particular direction. |
| What can cause velocity to change ? (2 things) | Speed or direction can both change this. |
| Acceleration | The rate at which velocity changes. |
| Acceleration is how fast what changes ? | velocity is how fast what changes? |
| Acceleration Formula | m/s- m/s divided by s |
| Positive Acceleration & Examples | When velocity increases. Riding your bike faster after each second. |
| Negative Acceleration & Examples | When velocity decreases. The skating example. |
| Centripetal Acceleration & Example | The acceleration that occurs in circular motion. |
| Force | a push or pull |
| Newton (N) | a unit expressing force. |
| Net Force | the force that results from combining all the forces on an object. |
| Why are unbalanced forces necessary to cause movement ? | so they don’t cancel each other out. |
| Balanced Forces | the forces applied to an object equal a net force of 0. |
| Friction | a force that opposes motion between two surfaces that are touching. |
| Sources of Friction | |
| Relationship between greater force & friction | creates more friction because the hills and valleys can come into closer contact. |
| Sliding Friction | If you push an eraser across your desk the eraser will slide for a minute and then come to a stop. |
| Rolling Friction | The friction between the wheels and the floor is an example of rolling friction. |
| Fluid Friction | opposes the motion of objects traveling through a fluid. |
| Ways to reduce friction – lubricants | substances that are applied to surfaces to reduce the friction between them. |
| Ways to reduce friction – sandpaper | rub this against a surface to make it smoother and reduce the amount of friction. |
| Ways to increase friction | make surfaces rougher to do this. |
| Gravity | a force of attraction between objects that is due to their masses. |
| Why must force be used to lift objects? | because gravity is pushing the force back down to earth. |
| What does the Law of Universal Gravitation state? (3 parts) | part 1: Gravitational force is small between objects with small masses. Part 2: Gravitational force is larger between objects with larger masses. Part 3: If the distance between two objects is increased, the gravitational force pulling them together is re |
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AD12398
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