Forces And Motion (10) Flashcards
In a distance-time graph, what does the gradient =
Gradient = speed
In a velocity-time graph, what does the gradient =
Gradient = acceleration
In a distance-time graph, flat sections represent …
Where there is no movement, the object has stopped moving
In a velocity-time graph, flat sections represent …
Steady speed
In a ____________-time graph, the steeper the graph, the greater the acceleration or decceleration
Velocity-time
In a distance-time graph, what do downhill sections mean
That it’s going back in the opposite direction
In a velocity-time graph, uphill sections (/) represent ________________
Acceleration
In a velocity-time graph, downhill sections () represent ________________
Deceleration
In which graph does the area underneath represent distance
In velocity-time graph
What does a curve represent on a velocity-time graph
Changing acceleration
How is slowing down represented on a distance-time graph
A levelling of curve
What can you calculate from a distance-time graph (1)
Speed
What can you calculate from a velocity-time graph (3)
Acceleration
Speed
Distance
How do you calculate the speed from a distance-time graph
Speed = gradient = vertical/horizontal
How do you calculate acceleration from a velocity time graph
Acceleration = gradient = vertical/horizontal
How do you calculate the speed from a velocity time graph
The speed is simply found by reading the value off the velocity axes
How do you find the distance travelled from a velocity time graph
The distance travelled is found from the the area underneath the graph
What does gravity give every object
A weight
What is mass
The amount of ‘stuff’ in an object
An object’s _________ will be the same anywhere in the universe
Mass
An object has the same ___________ whether is it is on the earth or the moon but its ___________ will be different
Same mass
Different weight
Weight is a __________
Force
Weight is measured in __________
Newtons
Weight is measured using a _____________ ___________
Newton meter
Mass is measured in _______________
Kilograms
On earth, the strength of gravity is _________
10 N/Kg
On the moon, the strength of gravity is _________
1.6 N/Kg
Name 3 different types of force
Gravity/weight Reaction force Electrostatic force Lift Tension Thrust Drag
When an object moves in a fluid (air/water), it feels _________ in the opposite direction to its motion
Drag
2 ways in which friction occurs
Between solid which are sliding past each other
Resistance or drag from fluids
Between solid surfaces which are gripping (table)
In a fluid, what happens to friction as the speed increases
The friction also increases
How can you reduce friction between 2 solids
Lubricant such as oil or grease between the surfaces
Due to a build up of resistance, the rate of acceleration slows down however the object is still _______________
Accelerating (getting faster)
Eventually once an object can’t accelerate any more it has reached its _____________ _____________
Terminal velocity
The accelerating force acting on all falling objects is ___________ and it would make them all accelerate at the same rate if it wasn’t for _______ _______________
Gravity
Air resistance
If an object such as a car is moving at a constant velocity, what do we know about the resultant force
It is zero (all the forces are balanced)
What does an unbalanced force produce
Acceleration or decceleration
The bigger the force, the ____________ the acceleration or deceleration
Greater
The bigger the mass, the _____________ the acceleration or deceleration
Smaller
To get a big mass to accelerate as fast as a small mass it needs a bigger __________
Force
A resultant force produces acceleration and the formula for this is
F = ma
In the formula F = ma, F must always be the _____________ _________
Resultant force
If object A exerts a force on object B then object B exerts the exact ____________ on object A
Opposite
