Science chapter 2 Motion Forces and energy
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41 terms
Terms | Definitions |
|---|---|
 force | a push or pull exerted on an object (p44) |
| net force | the combination of all forces acting on an object |
| unbalanced forces | a nonzero net force, which changes an object's motion (p46) |
| balanced forces | equal forces acting on an object in opposite directions (p46) |
| mass | the amount of matter in an object (p49) |
| newton | a unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second (p53) |
| friction | the force that acts to resist sliding between two touching surfaces |
| sliding friction | slows down an object that slides. |
| rolling friction | friction that occurs when an object rolls over a surface (p57) |
| gravity | the force that pulls objects toward each other (p58) |
| terminal velocity | the maximum velocity a falling object can achieve (p59) |
| weight | the force of gravity on an object at the surface of a planet (p59) |
| Give an example of sliding friction | brake pades on a car use sliding friction against the wheels to slow the car |
| If the forces are __________ forces their effects do not cancel out and the motion of the objects change | unbalanced (net force is not zero) |
| prevents an object from moving when force is applied | static friction |
| is needed to make a wheel turn without slipping on the ground | rolling friction |
| newtons second law of motion | an object acted upon by force will accelerte in the direction of the force |
| force = | mass X acceleration |
| the force of ___________ exists between any two objects that have mass | gravity |
| in order to know how a force will affect an objects motion, you must know | the direction of the force |
| if a net force acts at an angle to the direction an object is moving, the object will | follow a curved path |
| In a circular motion your direction is | constantly changing |
| in a circular motion you are | constantly acceleration |
| according to newtons second law if you are constantly accelerating | there must be a force acting on you at alltime |
| the constant speed a falling object reaches when air resistance balance the force of gravity | terminal velocity |
| Newtons 3rd law of motion | for every action there is an equal but opposite reaction |
| there is no delay in time between | the action and reaction (newtons 3rd law) |
| when you push on a wall | the wall pushes back on you with a force equal in strength to the force you exert |
| find the force on a 5 kg object that has an acceleration of 8 m/s2 | f= m x acceleration |
| what changes when an unbalanced force avts on an object | motion |
| name the force that slows a book sliding on a table | sliding friction |
| what combination of units is equivalent to a newton | kg x m/s2 |
| what is push or pull a definition of | force |
| what type of friction is important in ealking | static friction |
| an aobject is accelerated by a net force in which direction | in the direction of the force |
| if you exert 8N on a 2 kg object what will its acceleration be | force = M x acceleration so acceleration = force/m. answer is 4 m/s2 |
| you are riding a bike in which of the following situations are the forces acting on the nike balanced | you pedal at a constant speed. |
| what has no direction | mass |
| you push against a wall with a force of 5 N what is the force the wall exerts on your hands | 5 N |
| Newtons first law of motion | States that objects at rest will remain at rest or move with a constant velocity unless a force is applied. |
| Newtons first law of motion | An object at rest will remain at rest or an object in motion at constant speed in a straight line unless acted upon by an unbalanced force |
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