HELUS Science 8 Ch2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| A push or pull is called a ___. | force
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| A ___ ___ is the type of force that is only exerted when two objects are touching. | contact force
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| The type of force exerted on one object by another when the objects are not touching is called a ___ ___. | noncontact force
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| Gravity, magnetic force, and electric force are types of ___ ___. | noncontact forces
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| Because forces have magnitude and direction, they are ___. | vectors
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| The unit for the magnitude of a force is the ___. | newton
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| When one or more forces acts on an object, the forces ___. | combine
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| The ___ ___ is the combination of all the forces acting on an object. | net force
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| When the net force on an object is not zero, the forces are said to be ___ ___. | unbalanced forces
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| The ___ of an object changes only if unbalanced forces are acting on it. | velocity
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| ___ ___ occur when the net force on an object is zero. | Balanced forces
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| The motion of any object does not change if the forces acting on it are ___. | balanced
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| The scientist ___ ___ explained how forces cause motion to change. | Isaac Newton
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| 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
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| If the net force on an object is zero, the ___ of the object doesn’t change. | velocity
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| ___ is the tendency of an object to resist a change in its motion. | Inertia
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| Gravity is an attractive force between all objects that have ___. | mass
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| The ___ ___ ___ ___ states that all objects are attracted to each other. | law of universal gravitation
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| According to the law of universal gravitation, the force of attraction between two objects depends on their ___ and the ___ between them. | masses, distance
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| The ___ of an object is the gravitational force exerted on it. | weight
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| Weight is a force ___, having magnitude and direction. | vector
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| On Earth, weight is proportional to ___. | mass
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| The contact force that acts to resist sliding between two touching surfaces is called ___. | friction
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| ___ ___ is the force between two surfaces in contact that keeps them from sliding when a force is applied. | Static friction
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| Static means “___ ___.” | not moving
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| ___ ___ opposes the motion of two surfaces in contact that are sliding past each other. | Sliding friction
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| An ___ ___ is exerted by a material when it is stretched or compressed. | elastic force
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| The force exerted on a stretched rubber band is an example of a ___ ___. | tension force
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| The force exerted on a squeezed rubber ball is an example of a ___ ___. | compression force
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| A table exerts a ___ ___ on a cup resting on its surface. | normal force
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| The direction of a normal force is ___ to the surface of the object. | perpendicular
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| By identifying the forces acting on an object, you can predict its ___. | motion
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| Whenever an object’s speed or direction changes, an ___ ___ must be acting on the object. | unbalanced force
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| When a resting object is acted on by an unbalanced force, the object will ___ in the direction of the unbalanced force. | accelerate
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| An object’s speed will ___ when a net force acts in the same direction as the object’s motion. | increase
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| An object’s speed will ___ when a net force acts in the opposite direction of theobject’s motion. | decrease
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| Unbalanced forces can cause an object to speed up, slow down, or change ___. | direction
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| A ball tied to a string and swung in a circle is an example of ___ motion. | circular
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| During circular motion, the ___ ___ acts perpendicular to the velocity, toward the center of the circle. | centripetal force
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| When an object changes speed or direction, its velocity changes, and the object is ___. | accelerating
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| ___ ___ ___ ___ states that the acceleration of an object equals the net force divided by the object’s mass. | Newton’s second law of motion
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| In the equation representing Newton’s second law of motion, force is measured in ___and mass is measured in ___. | newtons, kilograms
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| The units of acceleration are ___. | meter/second squared
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| When the ___ ___ is zero, the acceleration is zero. | net force
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| When the acceleration of an object is zero, the ___ is constant. | velocity
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| When the net force is not zero, the velocity of the object ___. | changes
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| ___ ___ ___ ___ 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
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| The forces two objects exert on each other are called ___ ___. | force pairs
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| The forces in a force pair are equal in ___ and ___ in direction. | size, opposite
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| 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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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
jnosik
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