Chapter 5 & 6: Motion, forces, friction, gravity
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Created by:
aoedwards on November 13, 2009
Subjects:
Classes:
Cool dudes, yr 11 cam high, 7th Science, MCAS Biology, Edwards 8th Science
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45 terms
Terms | Definitions |
|---|---|
 What are forces? | a push or pull |
| What can unbalanced forces do? | move objects |
| Can balanced forces move objects? | no |
| What is Newton's first law of motion (state it): | Object at rest will remain at rest, moving object will remain in motion |
| What is another name for Newton's 1st law? | Law of inertia |
| What is inertia? | tendency of an object to resist change in motion |
| What does inertia depend on? | mass of an object |
| What is friction? | force of one surface against another |
| What does strength of friction depend on? | texture of the surfaces & how hard they are pushed together |
| What is Newton's 2nd law of motion? | force=mass x acceleration |
| What does Newtons second law mean in terms of changes in force and mass acceleration? | increase in force=increase in acceleration, increase in mass=decrease in acceleration |
| What is Newton's third law of motion? | every action there is an equal and opposite reaction; forces always act in pairs |
| What is gravity? | force of attraction between objects due to their masses |
| What is freefall? | only force acting on an object is gravity |
| What is acceleration? | the rate at which velocity changes over time |
| What is the acceleration due to gravity? Explain. | Every second an object is falling its velocity increases by 9.8m/s. all objects free fall accelerate at the same rate. |
| What is weight? | measure of the force of gravity on an object. |
| What is mass? | measure of the amount of matter in that object. |
| What is the Law of Universal Gravitation? | The force of gravity that acts between all objects in the universe, any two objects that attract each other. |
| What does the strength of gravitational pull depend on? | mass and distance between two objects. |
| How would you figure out your weight on the moon?? | multiply by 1/6 of weight on earth |
| motion | A change in position relative to a reference point, measured by distance and time |
| Frame of Reference | The point from which movement is determined |
| Speed | The distance traveled by moving objet per unit of time |
| Average Speed | The speed of moving objects is not always constant |
| Velocity | Speed in a given direction |
| Acceleration | The rate of change in velocity |
| Deceleration | Term used to mean a decrease in speed:negative acceleratrion |
| Force | Any push or pull |
| Friction | A force opposing motion |
| Gravity | The force of attraction between all objects in the universe |
| Free Fall | An object falling under the influence of gravity: no air resistance |
| Weight | The effect of gravity on an object's mass |
| Momentum | The product of the mass of an object and it's velocity |
| Newton's third law | Explains why forces act in pairs:for every force there is an equal and opposite reaction force |
| What is the speed of an object that travels 300 km in 6 hrs | 50km/hr |
| What is the average speed of a train that travels 300 km in 4 hrs and another 500 km in 4 hrs? | 100km/hr |
| What is the acceleration of a school bus traveling east that goes from 50 km/h to 100 km/h in 5 hrs? | 10km/h |
| Calculate the acceleration of a bicyclist traveling north that slows down from 15m/s to 5 m/s in 2 sec? | 5m/sec deceleraton |
| What is the Net Force? 25N--> <---40N | <----15N |
| What is the Net Force? --->15N --->10N | 35N---> |
| Balanced force | a force that will not cause an object to move |
| Unbalanced Force | a force that causes an object to move |
| Newton | unit used to measure force |
| Net force | Combination of all forces acting on an object |
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