Year 7 physics

Question 1

What is the difference between a short arrow, and a big arrow

Answer 1

a short arrow represents less force than a big arrow

Question 2

Which way does the arrowhead always point?

Answer 2

the arrowhead always points in the direction of the force

Question 3

What does balanced forces mean?

Answer 3

It means that it will either stay stationary or it will stay moving at a constant speed

Question 4

What does unbalanced forces mean?

Answer 4

It means that one force is stronger than another, thus making the object move

Question 5

formuler for force in Newtons?

Answer 5

Mass X acceleration

Question 6

What is net force?

Answer 6

how much it is moving in which direction = force X mass X acceleration

Question 7

define Mass

Answer 7

total amount of matter on an object (Your mass stays the same no matter where you are)

Question 8

define weight

Answer 8

how much gravity is affecting an object

Question 9

define the cause of friction

Answer 9

When two irregularities interlock with each other.

Question 10

Define the difference between mass and weight

Answer 10

Mass is the amount of matter in an object, whereas weight is the gravitational pull of that object

Question 11

define acceleration

Answer 11

How quickly a collection of mass changes its motion

Question 12

define speed

Answer 12

How fast you are going over a certain time.

Question 13

define the difference between speed and acceleration

Answer 13

speed is defined as the rate of change in distance with respect to time whereas acceleration is how quickly a collection of mass changes its motion

Question 14

define velocity

Answer 14

When something is accelerating or decelerating, it is changing its velocity

Question 15

define lift

Answer 15

used to counterweight gravity

Question 16

define drag

Answer 16

friction, and air resistance that comes when moving, it goes against any force of motion/air resistance

Question 17

define thrust

Answer 17

the amount of force it is going in a specific direction.

Question 18

10m|s

Answer 18

accelerating by 10m per second

Question 19

define 10m|s^2
10 meters per second per second

Answer 19

You change from 0 meters per second to 10 meters per second in a second

Question 20

define reactional force

Answer 20

reactional force is the weight of the book and the pull of gravity, then the book will fall through, and the table will break.

Question 21

Define frictional force

Answer 21

always opposes action

Question 22

define contact force

Answer 22

forces that act when touched

Question 23

what does a steel core do?

Answer 23

makes an electro magnet weaker

Question 24

what does adding coils of wire to an electro magnet do?

Answer 24

makes the electro magnet stronger

Question 25

The electro magnetic field

Answer 25

is like the one found around a bar magnet

Question 26

What does a smaller current through the coils of wire around an electromagnet?

Answer 26

makes an electro magnet weaker

Question 27

Which poles of a magnet attract to each other

Answer 27

north and south

Question 27

The more paper clips attracted to an electro magnet

Answer 27

the stronger the field around the electro magnet

Question 28

Which poles of a magnet repel each other

Answer 28

south to south or north to north

Question 29

How to find the mass of an object when you know weight and gravitational field strength

Answer 29

m=w/g

Question 30

How to find the weight of an object when you know the gravitational field, and the mass of an object

Answer 30

w=m*g

Question 31

How to find the gravitational field of an object when you know the weight, and mass

Answer 31

g=w/m

Question 32

What is the gravitational pull of earth?

Answer 32

9.83

Question 33

What is 1n as kg

Answer 33

1kg*m/s^2

Question 34

What does Kilonewton mean?

Answer 34

equal to 1000 newtons

Question 35

define independent variable

Answer 35

the variable we change in the experiment

Question 36

define dependent variable

Answer 36

the variable we measure in the experiment

Question 37

define control variables

Answer 37

the variable which doesn't change

Question 38

What to remember in graphs

Answer 38

- Remember to add measurements - Put the title at the bottom, it is a figure, not a table - Make it relative to the information/data given/provided Always have to start at zero