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Science 8
Unit II Quiz II
| Question | Answer |
|---|---|
| What is acceleration? | Rate of change in velocity |
| How do you calculate average speed? | Speed = Distance/Time |
| How do you calculate velocity? | SAME direction = ADD the velocities OPPOSITE directions = SUBTRACT the velocities |
| How do you calculate acceleration? | A= final velocity – initial velocity time |
| Velocity includes both _________________ and _____________________. | Speed and direction |
| What are the units of average speed? | Distance in m or km time in sec. or hours m/sec or km/h |
| What are the units of acceleration? | Meters/second/second or kilometers/hour/hour m/s/s or m/s2 |
| What is meant by acceleration, deceleration and + or – acceleration? | - rate of change in velocity over time - increase in velocity = acceleration - decrease in velocity = negative acceleration or deceleration |
| Why is circular motion accelerating? | Speed may stay the same but the direction is changing |
| What are forces? Balanced? Unbalanced? (What do they do?) | - Force is a push or a pull; gives energy to an object |
| What are Balanced forces? Unbalanced forces? (What do they do?) | -balanced forces: equal and in opposite directions; do not change the motion of an object; object does not move or continues at constant speed in one direction -unbalanced- one force overpowers another force; change the motion of an object |
| How do you determine the net force acting on an object? | - Forces act in direction - If there us more than one force acting on an object, the forces may be in same direct = ADD, opposite directions = SUBTRACT |
| What are the factors of friction? | - The greater the mass, the greater the amount of friction. - Rolling friction has less friction than sliding friction - Using lubricant creates less friction that if you did not use it. - The surface area has no affect on friction at all. |
| What is the effect of friction on movement? | A force that acts in a direction opposite to the motion of a moving object. Friction causes a moving object to slow down and finally stop. |
| What are the three types of friction? | rolling friction, sliding friction and fluid friction |
| What is Sliding friction? | Friction produced by solid objects sliding over each other. Sliding friction can oppose motion effectively. Example: A heavy desk will be difficult to move across a carpet versus a smooth floor. |
| What is Rolling friction? | Friction produced by rolling objects, such as wheels moving across a solid surface. Rolling friction tends to move easier across a surface than sliding friction. Example: The wheels on a car provide less resistance than a car without wheels. |
| What is Fluid friction? | Friction produced by an object that moves across or through a fluid. The force exerted by a fluid is called fluid friction. Example: Air resistance is an example of fluid friction. Air resistance makes a falling object slow down. |
| State and explain Newton’s First Law? | - An object remains at rest or in motion in a straight line unless acted upon by an unbalanced force. - For example when a person is a passenger in a moving car without a seat belt. When the car suddenly stops the person continues to go forward. |
| State and explain Newton’s Second Law? | - Acceleration of an object depends upon the mass of the object and the force applied. - If a filled shopping cart and an empty one are pushed with the same amount of force then the filled shopping cart (more mass) will accelerate less. |
| State and explain Newton’s Third Law? | When object A exerts a force on object B, object B will exert am equal and opposite force back on object A. Any time you touch an object it is touching you with the same amount of force. |
| What is inertia? | The tendency of matter to resist changes in its motion. |
| What is Newton’s 2nd law formula? | Force = mass X acceleration - Acceleration = force/mass - Force is measured in Newton (N) or kg (m/s2) 1N = kg(m/s2) |
| What is Newton’s 3rd law; action force / reaction force? | For every action force there is an equal (in size) and opposite (in direction) reaction force. Forces always come in pairs - known as "action-reaction force pairs." For example, chair pushing on the ground (action) and ground pushing back (reaction) |
Created by:
kolinchakm
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