Equations of Motions, Motion Graphs, Newton's 1st Law Flashcards
Compare distance-time graphs and displacement time graphs.
Unlike distance-time graphs, displacement time graphs can have negative slopes, and go below zero.
What is stopping distance?
Thinking distance + braking distance
What is thinking distance?
Distance travelled by the vehicle from seeing an emergency to the instance of beginning to applying the brakes.
What is braking distance?
The distance travelled by vehicle under the application of brakes.
What are the things that affect thinking distance?
1) Speed
2) Reaction time - drugs, alcohol, sleep, distraction
What are the things that affect the braking distance?
1) Condition / Quality of the brakes
2) Speed
3) Mass
4) Traction between the car and the road
5) Condition / Quality of the tire
How does the speed affect the stopping distance?
The speed affects the braking distance and the thinking distance. If the speed increases, the braking distance and thinking distance will increase too.
How to calculate the distance/displacement from the area under the graph?
To calculate distance/displacement, divide the area under the graph into rectangles and triangles. Add all.
The gradient of a distance-time graph gives you the _______.
The gradient of a distance-time graph gives you the speed.
The gradient of a displacement-time graph gives you the _____.
The gradient of a displacement-time graph gives you the velocity.
The gradient of a speed-time graph gives you the _____ and the area of a speed-time graph gives you the _____.
The gradient of a speed-time graph gives you the acceleration and the area of a speed-time graph gives you the distance.
The gradient of a velocity time graph gives you the ______ and the area of a velocity time graph gives you the ______.
The gradient of a velocity time graph gives you the acceleration and the area of a velocity time graph gives you the displacement.
What is Newton’s 1st law of motion?
Every material body continues to remain in its state of rest or state of uniform motion/velocity in a straight line unless acted upon by an external unbalanced force to change the state of motion. This law is also called the law of inertia.
What is Newtons’s 2nd Law?
The acceleration of an object is propotional to the resultant (net) force acting on the object. The acceleration is inversely proptional to the mass of the object.
A resultant force is not zero and will cause the object’s velocity to change.
Net unbalanced force (newtons)= mass(kg) * acceleration (m/s2)
F=ma
Acceleeration = force / mass
a=f/m
What is Newton’s 3rd law?
Every action has an opposite and equal reaction. When two objects interact, each object exerts a force on the other, these action and reaction forces are equal in magnitude and opposite and direction.
When two objects interact, both objects exert force.
Ex: Bird is applying action force on the air while flying
Ex: When you fire a bullet with a gun, both bullet and gun move. The gun recalls with lesser acceleration because the mass of the gun is greater
