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| Questão | Responda |
| What was Newton's Second Law? | it describes how force, mass, and acceleration are related. |
| What is the formula for acceleration? | acceleration=force/mass a=f/m F=m*a |
| What is Friction? | The force that opposes the sliding motion of the two surfaces that are touching each other. |
| What is the force that opposes most motion? | friction |
| How does Newton's 2nd law prove his first law? | If the force is 0 that means an object at rest is staying at rest and an object that is moving will continue moving at the same speed. |
| The amount of friction between 2 surfaces depends on what 2 factors? | 1) the kinds of surfaces 2)the force pressing the surfaces together. |
| What are microwelds? | They are kinds of surfaces |
| What is the frictional force that prevents two surfaces from sliding past each other? | Sliding Friction |
| What is the frictional force that opposes ttwo surface from sliding past each other? | Sliding Friction |
| What is the frictional force between a rolling object and the surface it rolls on ? | rolling friction |
| What is the friction-like force that opposes the motion of objects that move through the air (depends on the speed, size, & shape of the object) | air resistance |
| What is the highest speed a falling object will reach before air resistance= the acceleration due to gravity? | called terminal velocity is 9.8 m/s |
| what is an attractive force between any 2 objects that depends on the masses of the objects and the distance between them? | Gravity |
| What are the 4 basic forces of gravity? | 1) Gravity 2) Electromagnetic force 3) strong nuclear force 4) weak nuclear force |
| what calculates the force of gravity between 2 objects if their masses and distance between them is known | the law of universal gravitation |
| What is the formula for force? | F=G m1m2/d2 |
| what is the acceleration of falling objects on Earth due to the force of gravity? | 9.8m/sec2 |
| What is the property called that is related to how much force is needed to change the motion of an object? | Momentum |
| What is the formula for momentum? | momentum (p)= mass (m) * velocity (v) p=mv |
| This is not a question - it is an assignment - please do the practice problems on p.86 | this answer can only be right after you have done these |
| Momentum is not created nor destroyed - it just changes forms (or gets transferred from one object to another) - What is this law called? | The Law of Conservation of Momentum |
| the formula to find the force of Earth's gravity will always be.... | Force of gravity (N) = mass (kg)*acceleration |
| Acceleration due to gravity is always how much? | 9.8 m/s2 |
| What would the gravitational force be on a sky diver with a mass of 60kg | use your formula to solve! |
| How do you calculate weight of something or someone on earth? (formula) | Weight = mass x 9.8m/sec2 |
| What do we call the gravitational force on a mass? | it's weight |
| Why do astronauts appear to be weightless in space? | a space shuttle is in free fall but it is falling around the Earth rather than straight downward (see fig 15 pg 79) |
| How are horizontal & vertical motions affected by gravity? | check out you textbook - p. 80, fig 16 & 17 |
| The net force exerted toward the center of a curved path is called | centripetal force |
| What force keeps your car's traction moving around a curved path? | Centripetal Force |
| acceleration toward the center of a curved path is _____ | centripetal acceleration |
| State Newton's 3rd Law of Motioin | For every action force, there is an equal and opposite reaction |
| Give 2 examples of Newton's 3rd law in action | 1) rocket propulsion 2) skaters pushing against a wall and moving backward (p. 83, fig 21) |
| What is a property that is related to how much force is needed to change the motion of an object? | Momentum |
| What Law says that momentum is not created nor destroyed it just changes forms ( or gets transferred from one object to another) ? | Law of Conservation of Momentum |
| What is the law for Momentum? | p(momentum)=m(k/g) times v(m/s) |
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