paper 2

Question 1

what is a vector

Answer 1

has magnitude and direction

Question 2

what is a scalar

Answer 2

just a magnitude

Question 3

what are vectors represented by

Answer 3

arrows and their length determine the vectors magnitude

Question 4

what is a force

Answer 4

a push or pull acting on an object due to interaction with other objects

Question 5

what is a non contact force

Answer 5

it is when the 2 objects do not have to be touching
2 types are electrostatic and gravitational attraction

Question 6

what is a contact force

Answer 6

this is when the objects are physically touching
such as a normal contact force and friction

Question 7

what is weight

Answer 7

the force exerted on mass by a gravitational field

Question 8

what happens to a persons mass and weight when they are on different planets

Answer 8

their mass stays the same but their weight is different as a result of planets having different gravitational field strengths

Question 9

what is the gravitational field strength of earth

Answer 9

9.8

Question 10

where is the weight of an object considered to act

Answer 10

at the objects centre of mass

Question 11

what is the resultant force

Answer 11

single force representing the sum of all forces acting on an objects

Question 12

what is terminal velocity

Answer 12

this is when all the forces acting on an object are equal resulting in the object moving at a constant speed

Question 13

what is work done

Answer 13

Work done is when energy is transferred from the object doing the work to another form
Work done against frictional forces causes a rise in temperature of the object

Question 14

what is required to bend stretch or compress an object

Answer 14

To stretch, bend or compress an object, more than one force has to be applied
If a single force is applied to an object, it will just move in that direction

Question 15

elastic deformation

Answer 15

The object returns to its original shape when the load has been removed

Question 16

plastic deformation

Answer 16

The object does not return to its original shape when the load has been removed

Question 17

what is hookes law

Answer 17

The extension of an elastic object, such as a spring, is directly proportional to the force applied

Question 18

what is displacement

Answer 18

it is a vector that includes both distance and direction

Question 19

what is velocity

Answer 19

speed in a given direction
it is also a vector

Question 20

what happens to the velocity of an object if it is consistently moving in a circle

Answer 20

the velocity constantly changes
and a change in velocity is acceleration meaning that although it may not be speeding up it is accelerating as it is constantly changing direction

Question 21

displacement time graphs

Answer 21

Gradient is velocity
Sharper gradient means faster speed
Negative gradient is returning back to starting point
Horizontal line means stationary
Curved Line means that the velocity is changing
(acceleration)
If an object is accelerating, its speed can be
determined by drawing a tangent

Question 22

velocity time graphs

Answer 22

Gradient is acceleration
Sharper gradient means greater acceleration
Negative gradient is deceleration
Horizontal line means constant speed
0 Velocity means that it is stationary
Area under line = distance traveled
Curved Line means that the acceleration is changing

Question 23

Newtons first law

Answer 23

An object has a constant velocity unless acted on by a resultant force

Question 24

Newtons second law

Answer 24

The acceleration of an object is proportional to the resultant force acting on the object, and
inversely proportional to the mass of the object.

Question 25

what is inertia

Answer 25

The measure of how difficult it is to change the velocity of an object

Question 26

Newtons 3rd law

Answer 26

whenever 2 objects interact they exert forces that are opposite and equal

Question 27

what is stopping distance

Answer 27

thinking distance + breaking distance

Question 28

what is the relationship between speed and breaking distance

Answer 28

the faster the speed the longer the breaking distance will be

Question 29

what happens when a force is applied onto the breaks of a vehicle

Answer 29

Work is done by the brakes (by friction) onto the wheel
So the vehicle’s KE reduces
And the temperature of the brakes increase

Question 30

momentum

Answer 30

momentum is mass multiplied by velocity
and momentum is always conserved in an explosion or collision