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SCI8CH2
HELUS Science 8 Ch2
| Question | Answer |
|---|---|
| A push or pull is called a ___. | force |
| A ___ ___ is the type of force that is only exerted when two objects are touching. | contact force |
| The type of force exerted on one object by another when the objects are not touching is called a ___ ___. | noncontact force |
| Gravity, magnetic force, and electric force are types of ___ ___. | noncontact forces |
| Because forces have magnitude and direction, they are ___. | vectors |
| The unit for the magnitude of a force is the ___. | newton |
| When one or more forces acts on an object, the forces ___. | combine |
| The ___ ___ is the combination of all the forces acting on an object. | net force |
| When the net force on an object is not zero, the forces are said to be ___ ___. | unbalanced forces |
| The ___ of an object changes only if unbalanced forces are acting on it. | velocity |
| ___ ___ occur when the net force on an object is zero. | Balanced forces |
| The motion of any object does not change if the forces acting on it are ___. | balanced |
| The scientist ___ ___ explained how forces cause motion to change. | Isaac Newton |
| Newton’s ___ ___ ___ ___ states that if the net force on an object is zero, an object at rest remains at rest, or, if the object is moving, it continues to move in a straight line with constant speed. | first law of motion |
| If the net force on an object is zero, the ___ of the object doesn’t change. | velocity |
| ___ is the tendency of an object to resist a change in its motion. | Inertia |
| Gravity is an attractive force between all objects that have ___. | mass |
| The ___ ___ ___ ___ states that all objects are attracted to each other. | law of universal gravitation |
| According to the law of universal gravitation, the force of attraction between two objects depends on their ___ and the ___ between them. | masses, distance |
| The ___ of an object is the gravitational force exerted on it. | weight |
| Weight is a force ___, having magnitude and direction. | vector |
| On Earth, weight is proportional to ___. | mass |
| The contact force that acts to resist sliding between two touching surfaces is called ___. | friction |
| ___ ___ is the force between two surfaces in contact that keeps them from sliding when a force is applied. | Static friction |
| Static means “___ ___.” | not moving |
| ___ ___ opposes the motion of two surfaces in contact that are sliding past each other. | Sliding friction |
| An ___ ___ is exerted by a material when it is stretched or compressed. | elastic force |
| The force exerted on a stretched rubber band is an example of a ___ ___. | tension force |
| The force exerted on a squeezed rubber ball is an example of a ___ ___. | compression force |
| A table exerts a ___ ___ on a cup resting on its surface. | normal force |
| The direction of a normal force is ___ to the surface of the object. | perpendicular |
| By identifying the forces acting on an object, you can predict its ___. | motion |
| Whenever an object’s speed or direction changes, an ___ ___ must be acting on the object. | unbalanced force |
| When a resting object is acted on by an unbalanced force, the object will ___ in the direction of the unbalanced force. | accelerate |
| An object’s speed will ___ when a net force acts in the same direction as the object’s motion. | increase |
| An object’s speed will ___ when a net force acts in the opposite direction of theobject’s motion. | decrease |
| Unbalanced forces can cause an object to speed up, slow down, or change ___. | direction |
| A ball tied to a string and swung in a circle is an example of ___ motion. | circular |
| During circular motion, the ___ ___ acts perpendicular to the velocity, toward the center of the circle. | centripetal force |
| When an object changes speed or direction, its velocity changes, and the object is ___. | accelerating |
| ___ ___ ___ ___ states that the acceleration of an object equals the net force divided by the object’s mass. | Newton’s second law of motion |
| In the equation representing Newton’s second law of motion, force is measured in ___and mass is measured in ___. | newtons, kilograms |
| The units of acceleration are ___. | meter/second squared |
| When the ___ ___ is zero, the acceleration is zero. | net force |
| When the acceleration of an object is zero, the ___ is constant. | velocity |
| When the net force is not zero, the velocity of the object ___. | changes |
| ___ ___ ___ ___ states that when one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object. | Newton’s third law of motion |
| The forces two objects exert on each other are called ___ ___. | force pairs |
| The forces in a force pair are equal in ___ and ___ in direction. | size, opposite |
| One of the forces in a force pair is called the ___ ___ and the other force is called the ___ ___. | action force, reaction force |
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jnosik
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