P2

Question 1

Acceleration,

Answer 1

The rate at which velocity changes

Question 2

Motion in a circle

Answer 2

Constant net force perpendicular to velocity

Question 3

Speed

Answer 3

The distance an object travels per unit of time

Question 4

Time

Answer 4

How long something takes

Question 5

Calculating average speed

Answer 5

total distance/total time

Question 6

Gradient equation

Answer 6

change in y/change in x

Question 7

Acceleration equation

Answer 7

change in velocity/time taken

Question 8

Kinetic energy equation (Joules)

Answer 8

0.5massspeed^2

Question 9

Velocity time graphs

Answer 9

Shows how the speed or velocity of an object changes over time

Question 10

Newton’s first law of motion

Answer 10

An object in motion will remain in motion unless acted upon by another force

Question 11

Vector diagrams

Answer 11

The resultant vector for two vectors at right angles to each other can be worked out using a scale diagram, or using a calculation.

Question 12

Newton’s Third Law

Answer 12

For every action there is an equal and opposite reaction

Question 13

Momentum

Answer 13

The product of mass and velocity. It is also a vector quantity - this means it has both a magnitude and an associated direction.

Question 14

Conservation of momentum

Answer 14

A ‘closed system’ is something that is not affected by external forces.

Question 15

Work done equation

Answer 15

Force(N) * distance(M)

Question 16

Power

Answer 16

The rate at which work is done

Question 17

Elastic deformation

Answer 17

Can be reversed if the force is removed

Question 18

Extension

Answer 18

When an object increases length

Question 19

Compression

Answer 19

When an object decreases length

Question 20

Elastic potential energy

Answer 20

The energy of stretched or compressed objects.

Question 21

Gravity

Answer 21

A force of attraction between objects that is due to their masses.

Question 22

Mass

Answer 22

The amount of matter in an object

Question 23

Gravitational potential energy

Answer 23

When an object is lifted in a gravitational field, energy is transferred to a gravity store.

Question 24

Scalar quantity

Answer 24

A quantity that can be described by magnitude only and has no direction

Question 25

Vector quantity

Answer 25

A quantity that has both magnitude and direction

Question 26

Velocity

Answer 26

Speed in a given direction

Question 27

Distance

Answer 27

The length of a path between two points

Question 28

Equation for Speed

Answer 28

distance/time

Question 29

Distance time graphs

Answer 29

Shows how an object moves. The stationary line means distance does not change. When moving at a steady speed its a straight diagonal line (steeper means faster). If line slopes down, object is returning to starting position and slowing down.

Question 30

Velocity equation

Answer 30

Velocity= change in position/time

Question 31

Resultant forces,

Answer 31

Two forces can be added together to find it, also is a single force that has the same effect as two or more forces acting together.

Question 32

Newton's Second Law

Answer 32

Force = mass x acceleration

Question 33

Terminal velocity

Answer 33

The constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity

Question 34

Momentum equation

Answer 34

mass x velocity

Question 35

Work done

Answer 35

When energy is transferred from one store to another and it is also done when a force causes an object to move.

Question 36

Power equation

Answer 36

work/time

Question 37

Plastic deformation

Answer 37

Can't be fully reversed when the force is removed and their is a permanent change in shape.

Question 38

Elastic limit

Answer 38

Maximum stress that a material will withstand without permanent deformation.

Question 39

Force-extension graph

Answer 39

Linear extension and elastic deformation can be seen below the elastic limit. Non-linear extension and plastic deformation can be seen above the elastic limit. The gradient of a force-extension graph before the elastic limit is equal to the spring constant.

Question 40

Energy stored in a spring

Answer 40

Work is done when a spring is extended or compressed.

Question 41

Weight

Answer 41

A measure of the force of gravity on an object

Question 42

Gravitational field strength

Answer 42

Where a mass experiences a force.

Question 43

Gravitational potential energy equation

Answer 43

mass x gravitational field strength x height

Question 44

What are non-contact forces?

Answer 44

A force produced because an object is in a field (two objects that don't touch but create a force).

Question 45

Name some examples of non-contact forces

Answer 45

Electrostatics, magnetism, gravity

Question 46

How do you draw a freebody diagram?

Answer 46

Step 1: Identify all non-contact pairs Step 2:Identify all contact pairs Step 3: Focus on a single object. Draw that object with arrows showing all the forces acting on the object.

Question 47

How do you resolve forces?

Answer 47

You can add up the two forces at a right angle.