Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
9 Cards in this Set
- Front
- Back
|
First law of motion |
If the sum of all forces acting on an object is zero (zero= balanced forces) the object will either stay still or move with constant speed in a straight line, so if resultant is zero there is no acceleration. |
|
|
Second law of motion |
The acceleration on an object is directly proportional to the resultant force acting on it and inversely proportional to its mass. F=ma (forces on the direction of movement are positive and opposite are negative) |
|
|
Free-body diagram |
Shows all forces acting on a body, all forces are drawn from the same point. |
|
|
Frictional forces |
Caused by relative motion between two objects which are always in contact, always opposites in motion, also called drag. |
|
|
Air resistance |
Caused by friction with air, gets larger as the velocity increases. |
|
|
Terminal velocity |
Weight constant, air resistance getting larger as falling object speeds up, eventually air resistance equals weight so resultant force is zero, so no acceleration, constant velocity called terminal velocity. |
|
|
Gravitational field strength |
Force per unit mas exerted by a gravitational field. |
|
|
Weight |
W=mg |
|
|
Mass |
Amount of matter an object has (kg) |
