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Motion & Forces
| Question | Answer |
|---|---|
| What is used for comparison to determine if something is in motion? | reference point |
| What is speed in a given direction? | velocity |
| What is the distance an object travels in one unit of time? | speed |
| What occurs when something's reference point is changing? | motion |
| What occurs when the velocity of an object changes? | acceleration |
| A push or a pull is a _______ | force |
| What is the force that accelerates objects towards earth? | gravity |
| A measure of force of gravity on an object is _______ | weight |
| What is the tendency of an object to resist a change in motion? | inertia |
| What is the product of an object's mass and velocity? ( Mass x Velocity ) | momentum |
| What is the general term for the force that one object exerts on another when they rub against each other? | friction |
| _______ forces can change an object's motion. | unbalanced |
| _______ friction is the kind of friction that slows a falling object. | fluid friction |
| The amount of inertia an object has depends on its ________. | mass |
| A falling object reaches ________ when forces of gravity and air resistance are balanced. | terminal velocity |
| If you increase the mass of an object, its acceleration ________. | decreases |
| A child riding a merry-go-round is accelerating because his direction is _______. | changing |
| Friction depends on the types of surfaces involved and how _______ the surfaces push together. | hard |
| _______ friction is the friction that acts on objects that are not moving. | static |
| _______ friction is when two solid surfaces slide over each other. | sliding |
| _______ friction is when an object rolls across another surface. | rolling |
| _______ is when the only force acting on an object is gravity. | free fall |
| States that an object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force. | Newton's first law of motion |
| States that acceleration depends on the object's mass and on the net force acting on the object. | Newton's second law of motion |
| States if one object exerts a force on another object, the second object exerts a force of equal strength in the opposite direction on the first object. | Newton's third law of motion. |
| The Law of ______ of ______ is the total momentum of any group of objects remains the same , or is conserved, unless outside forces act on the object. | conservation of momentum |
| What is the force that causes an object to move in a circular path? | centripetal force |
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redskinsman3
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