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Science 8

Unit II Quiz II

QuestionAnswer
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