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Week 12 - Speed (Grade 7 - Science)
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A motorcycle’s velocity at the topof thehill is11.0m/s.4.0 seconds later it reaches the bottom of the hill with a velocity of 20.0 m/s. What was the acceleration of the motorcycle?
2.25m/s2
Fluid resistance can be....
Air resistance, § Water resistance, § or resistance from other fluid material—even mud.
Drag force depends on:
Shape of the object § Size of the object § Medium through which you move it § Speed of the object.
How fast something is moving
Speed
The act of something moving, a change in position.
MOTION
The measure of the speed and the direction of a specific object
Velocity
The space between two things.
Distance
Drag forces that slow down objects movement.
Resistance
A push or a pull. Force is what causes motion.
Force
A force that acts in an opposite direction to movement. The more friction something has, the harder it is to move.
Friction
The force that attracts objects towards an other object. On earth, gravity pulls us towards the center of the earth.
Gravity
The tendency of things to keep traveling in the same direction at the same speed, unless something stops them.
Inertia
When an object moves across a surface, it can encounter resistive force BETWEEN THE SURVICE that can SLOW DOWN and even STOP THE MOVE of the object.
Friction
What occurs when a SOLID OBJECT pushes its way through a LIQUID, such as water, or a gas, such as air.
Fluid resistance
A force that inhibits or RESISTS THE MOTION of an object. It acts in a direction opposite of any motion
ResistiveForce
Analyse the graph
The SPEED(m/s) is INCREASING as time(s)passes • The object speed is CHANGING• This shows(+) ACCELERATION
Analyse the graph
The SPEED(m/s) is CONSTANT as time(s) passes• The object’s SPEED is NOT CHANGING• This shows(0) ACCELERATION
Analyse the graph
The distance(m) DECREASING as time (s) passes• The distance gets SMALLER AND SMALLER with each second• This shows(-) ACCELERATION
Analyse the graph
The distance(m) INCREASING as time(s) passes• The distance gets LARGER AND LARGER with each second• This shows(+) ACCELERATION
what is Formula for acceleration?
What does Zero Acceleration mean?
Constant or no speed
What does Negative Acceleration mean?
Object slows down
What does Positive Acceleration mean?
Object speeds up
What measures HOW MUCH an object’s SPEED CHANGE over a certain time.
Acceleration
a description of both speed and direction is called......
Velocity
Analyse this graph
In Part A, the object is moving away at a constant speed • In Part B, the object is at rest • In Part C, it is moving towards at constant speed
Analyse this graph
The object is MOVING TOWARDS the reference point • The object is moving at a CONSTANT SPEED• The object is MOVING SLOWLY
Analyse this graph
The object is MOVING AWAY from the reference point • The object is moving at a CONSTANT SPEED • The object is MOVING QUICKLY
Analyse this graph
The distance (m) STAYS THE SAME as the time(s) increases. • Therefore, the object is AT REST (not moving)
What are distance and displacement?
Distance=180, Displacement=127
The distance and direction of an object moves from a starting position.
Displacement
How far an object moves in total is called..................
Distance
How to calculate speed?
the distance an object travels per unit of time
Speed
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