Flashcards in Physics Deck (97)
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1
The steeper the line on a distance time graph
The greater the speed
2
Velocity is
Speed in a given direction
3
Acceleration is
The change of velocity per second
4
The equation for acceleration is
A= V-U/T
A- acceleration
V- final velocity
U- initial velocity
T- time
5
If the line on a velocity time graph is horizontal
The acceleration is zero
6
The area under the line on a velocity time graph is
The distance travelled
7
A force can change the
Shape of an object or change its motion or state of rest
8
The unit of force is
Newton
9
When two objects interact they
Always exert equal and opposite forces on each other
10
The resultant force is
A single force that had the same effect as all the forces acting on an object
11
If an object is accelerating
There must be a resultant force acting on it
12
The bigger the resultant force
The greater its acceleration
13
The greater the mass of an object
The smaller it's acceleration for a given force
14
Equation for resultant force
F=mXa
F- resultant force
M- mass kg
A- acceleration m/s^2
15
Friction and air resistance oppose
The driving force of a car
16
The stopping distance of a car depends
on the thinking distance and the braking distance
17
The weight of an object is
The force of gravity on it it's mass is the quantity of matter
18
The terminal velocity of a falling object is
The velocity it reaches when it is falling in a fluid the weight is then equal to the drag force on the object
19
The extension is
The difference between the length of the spring and it's the original length
20
The extension of a spring is
Directly proportional to the force applied to it provided the limit of proportionality is not exceeded
21
The spring constant of a spring is
The force per unit extension needed to stretch it
22
Equation for Hookes law
F=kXe
F- force
K- spring constant
E- extension
23
Fuel economy of road vehicles can be improved by
Reducing the speed or fitting a wind deflector
24
Average speed cameras are
Linked in pairs and measure average speed
25
The gradient of the line on a distance time graph represents
An objects speed
26
A force can
Change the shape of an object or change its motion or state of rest
27
When two objects interact the always
Exert equal and opposite forces on each other
28
What is terminal velocity
Terminal velocity of a falling object is the velocity it reaches when it is falling in a fluid. The weight is then Equal to the drag force on the on the object
29
Explain work done
Work is done on an object when a force makes the object move
Energy transferred=work done
Work done to overcome friction is transferred as energy that heats the objects that rub together and the surroundings
30
