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Force, Mass, Weight
| Question | Answer |
|---|---|
| What is gravity? | Force of attraction between objects due to their masses |
| All objects in the universe attract each other through gravitational force. What is this called? | Law of universal gravitation |
| What does the size of the gravitational force between objects depend on? | mass of the objects and distance between the objects |
| What is the acceleration of an object due to gravity? | 9.8m/s/s |
| What does an object have when it is falling at a constant velocity? | terminal velocity |
| What is Newton's first law of motion? | An object at rest remains at rest and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force. |
| What is Newton's second law of motion? | The acceleration of an object depends on the mass of the object and the amount of force applied. |
| What is fluid friction that opposes the motion of falling objects? | air resistance |
| What is mass? | The amount of matter in an object |
| What is the measure of the gravitational force on an object? | weight |
| What is net force? | the force that results from combining all the forces exerted on an object |
| What metric unit is used to express force? | newton |
| What is the formula for acceleration? | A = V₂ - V₁ / T |
| ∆v = g • t is the formula for _______________. | final velocity of a falling object |
| Newton's first law is sometimes called the law of________________. | inertia |
| What is inertia? | The tendency of all objects to resist any change in motion. |
| What is the formula for force? | F = m • a |
| What is the formula for speed? | S = D / T |
| What force is necessary to produce a change in motion or cause a non-moving object to move? | unbalanced force |
| What are balanced forces? | forces on an object that cause the net force to be zero - no change in motion |
| How are force and weight related? | gravity is a force and weight is the measure of gravity |
| What does this symbol (∆v) mean? | change in velocity |
| What is Newton's third law? | Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first |
| All forces act in ________________. | pairs |
| What are the 3 forms of acceleration? | speeding up, slowing down, and changing direction |
| Can a moving object have balanced forces? | yes, it can be moving at a constant speed in a straight line |
| What is the common metric unit used for acceleration? | m/s/s or m/s2 |
| What is the common metric unit used when referring to the velocity of a falling object? | m/s |
| What instrument is used for measuring weight? | a spring scale |
| What instrument is used for measuring mass? | a triple beam balance |
| What metric and English units are used for measuring weight? | Metric - Newton, English - Pounds |
| Are mass and weight the same thing? | No - mass never changes and weight changes with gravitational changes |
| What is a vacuum? | a space with no air |
| What is free fall? | When the only force acting on a falling object is gravity |
| Where does free fall occur? | only in space or in a vacuum |
| Why do astronauts seem to float around in their space shuttle? | because of the combination of their forward motion & falling motion toward the Earth, they have the effect of "zero gravity" |
| What is the moon's gravity? | 1.6 m/s/s |
| What is a force that opposes motion? | friction |
| What are the four types of friction? | sliding, rolling, fluid, and static |
| The mass of object A is 4.5kg and the mass of object B is 6kg. If the same force is applied, which object will have greater acceleration? | Object A |
Created by:
lcollette
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