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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

Describe GPE

GPE is energy stored in a object because of its postions in Earths gravitational field. The GPE of an object depends on its weight and how far it moves vertically