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Beaver Local 12
| Question | Answer |
|---|---|
| An object at rest remains at rest and an object in motion maintains its velocity unless it experiences a net force | Newton's First Law of Motion |
| Objects change their state of motion only when a ______ __________ is applied | Net Force |
| What eventually will cause a bowling ball thrown down an indefinitely long lane to eventually come to a stop? | Friction |
| The tendency of an object to resist a change in motion unless an outside force acts on the object | Inertia |
| Why do all objects have inertia? | Because all object resist a change in motion |
| Which object has less inertia: a basketball or a car? | A basketball |
| Why would a basketball have less inertia than a car? | Because a basketball has a smaller mass than a car |
| Matter resists any change in motion because the matter has inertia is known as the law of ____________ | Inertia |
| The law of inertia is also known as: | Newton's First Law of Motion |
| Which law describes what happens when NO net force is acting on an object? | Newton's First Law of Motion |
| The unbalanced force acting on an object equals the object's mass times its acceleration | Newton's Second Law of Motion |
| Net Force = mass X acceleration | Newton's Second Law of Motion |
| The ______________ _________________ on an object determines how much an object speeds up or slows down | Unbalanced Force |
| F = ma | Newton's Second Law of Motion |
| For equal forces, a larger mass accelerates (more or less)? | Less |
| Why would a 15 lb box accelerate faster than a 150 lb box, when pushed with equal forces? | Because the 15 lb box has less mass |
| What is the SI unit of force? | The newton (N) |
| 1 N = 1 kg X 1 m/s2 | Newtons' Second Law of Motion |
| T or F: Accerlation depends on force and mass. | True |
| The acceleration of an object is directly proportional to the net force on the object and inversely proportional to the object's mass | Newton's Second Law of Motion |
| The force on an object due to gravity is called __________________ | weight |
| Your weight is simply the amount of _______________________ _____________ exerted on you by the Earth | gravitational force |
| weight is = to what? | weight is = to mass X free-fall acceleration |
| free-fall acceleration equals ____ m/s2 | 9.8 |
| _____________ is the measurment of the amount of matter in an object | Mass |
| ______________ is the gravitational force that an object experiences because of its mass | Weight |
| Why does an anstronaut's weight change on the moon but his/her mass does not change? | The weight changes on the moon because the gravitational force acting on the astronaunt changes in each place |
| What law does this refer to: All objects in the universe attract each other through the force of gravity? | Law of universal gravitation |
| Gravitational Force ____________ as mass increases | increases |
| Gravitational force _____________ as distance increases | decreases |
| The motion of a body when only the force of gravity is acting on the body | free fall |
| In the absense of air resistance, all objects falling near Earth's surface accelerate at the ______ ______ regardless of their mass | same rate |
| What 2 things act on objects moving through Earth's atmosphere? | air resistance and gravity |
| When do all falling objects stop? | When the force of air resistance becomes equal to the gravitational force on the object |
| When air resistance and weight are equal, the object stops accelerating and reaches its maximum velocity. This is called? | terminal velocity |
| The curved path followed by an object that is thrown, launched, or otherwise projected near the surface of Earth is known as what? | Projectile motion |
| What 2 components does projectile motion have? | horizontal and vertical |
| When you throw a ball, the force that your hand exerts on the ball to move it forward is known as _________________ motion | horizontal |
| When you throw a ball, what causes the ball to eventually drop to the ground? | It falls to the ground because of the projectile motion's vertical component |
| For every action force, there is an equal and opposite reaction force: this is known as: | Newton's 3rd Law |
| True of False: The moment that you kick a ball, the ball exerts an equal and opposite force on your foot? | True |
| The moment you kick a ball, the ball exerts an equal and opposite force on your foot explains which law? | Newton's 3rd Law |
| When you kick a ball, the force exerted on the ball by your foot is known as: | action force |
| When you kick a ball, the force exerted on your foot by the ball is called: | reaction force |
| The understanding that every force is made up of an action force and a reaction force is: | force pair |
| Why don't forces in a force pair cancel each other out? | The don't cancel each other out because they act on different objects. |
| A quantity defined as the product of the mass and velocity of an object | momentum |
| Momentum = mass X velocity | p = mv |
| Momentum ______________ as mass and velocity increases | increases |
| If an object is not moving, what is its momentum? | Zero |
| The greater the mass of an object, the __________________ the momentum of the object | greater |
| When you force an object to change its motion (catch a baseball), you force what else to change? | Its momentum |
| The total amount of momentum in an isolated system in conserved is known as: | Law of Conservation of momentum |
| The total momentum of two or more objects after a collision is the ___________ as it was before the collision | same |
Created by:
kjones0722
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