Motion - Overall Study Flashcards
Define velocity
Change in displacement divided by change in time
What is the equation for acceleration?
Acceleration = change in speed/time taken
= v2-v1/t
Name an action-reaction pair
Gravity normal force
Pushing against a wall wall pushing back
Other examples can be added
At what rate does Earth pull objects to its centre due to gravity?
9.8m/s^2
What equation can you generally use to calculate weight?
F=mg
F=Force (gravity)
m=mass
g=acceleration due to gravity
What two things determine weight?
Mass and gravity
What three statements can be created from F=ma
- The more massive the object, the greater the force needed to accelerate it
- The greater the force applied, the quicker it will accelerate
- If the same force is applied to a more massive object, the acceleration will be less.
How else can Newton’s second law of motion be written?
F=ma
Say someone is not wearing a seatbelt in a head-on collision, what is likely to occur?
They will likely fly through the front window of a car/vehicle
Where is a common place where inertia is felt?
Car, bus, plane, vehicle, rollercoaster etc.
What is another term for Newton’s first law of motion?
Inertia
Can the distance travelled from a speed-time graph be calculated? If so, how?
Yes. By finding the area under the speed-time graph
What does a speed-time graph show?
The speed of a travelling object as time pases
What does a displacement-time graph show?
How far an object moves from its starting point over a period of time.
How do you calculate the gradient within a graph?
Rise/run
What does a distance-time graph show?
How far an object moves as time progresses
TRUE or FALSE
The acceleration of something can be a negative number.
True
What is the equation for average speed?
Speed (m/s or km/h) = distance travelled/time taken
v = d/t
What is the equation for average velocity?
Average velocity = displacement/time taken
–>v = –>d/t
How many seconds are in 1 hour?
3600
What are the SI Units for:
- Length
- Time
- Mass
- meters
- seconds
- kilograms
Define Newton’s third law of motion.
For every action, there is an equal and opposite reaction
Define weight
your mum
The weight of an object is the force of gravity on the object and is defined as the mass times acceleration of gravity: w=mg
Define mass
Mass is the quantity of matter in a body regardless of its volume or any of the forces acting upon it.
Define Newton’s second law of motion.
An object acted upon by a force experiences acceleration in the same direction and proportional to the magnitude of the net force, and inversely proportional to the mass of the object.
F=ma
Define net force
The sum of all the forces acting on an object
Define force
Any interaction that, when unopposed, will change the motion of an object
Define inertia
A property of matter that keeps something in the same position or moving in the same direction unless acted upon by an external force.
Define Newton’s first law of motion.
an object will remain at rest or in uniform motion in a same direction unless acted upon by an external force
Define origin
The point at which the axes of a coordinate system intersect
Define gradient
The gradient of the graph is the rise over the run
Define constant speed
When an object is travelling at the same speed and is not accelerating or decelerating.
Define deceleration
When an object is slowing down
Define acceleration
An object has acceleration when its velocity changes. Average acceleration equals change in velocity divided by the time taken. The most common unit is m/s
Define instantaneous speed.
The speed at any particular instant
Define average speed
Change in distance divided by change in time; usually measured in km/h or m/s
Define speed
Change in distance divided by time
Define displacement
How far you are from where you started and what direction you are from where you started
Define distance
Total distance travelled
