Year 7 Spr1 Forces and waves

Question 1

A force

Answer 1

Something that can push or pull

Question 2

Gravity

Answer 2

Humans have always wanted to fly, if gravity you would be able to float. Nearly like flying. This is a pushing force.

Question 3

Friction

Answer 3

Friction hold back the movement of a sliding object. If this force wasn’t here you’d just fall over.

Question 4

Reaction force

Answer 4

The force that keeps gravity from digging you into the ground it is also a pushing force

Question 5

Air resistance

Answer 5

The force that makes it so when your skydiving you dont go at an infinite amount of speed. If this force wasn’t here skydiving would be a way to kill yourself

Question 6

Water resistance

Answer 6

Its exactly like air resistance but for water. Water resistance is resistance that makes it so you couldn’t just go ridiculously fast in water

Question 7

Magnetic force

Answer 7

Magnets exert a magnetic force onto other magnets or objects, if that material happens to be magnetic it will be sucked towards the magnet. This force is a non-contact force

Question 7

Electrostatic force

Answer 7

If you rub a ballon on paper you cam eventually pick up the paper, that is what an electrostatic force does. This force is a non-contact force

Question 9

Hookes law

Answer 9

This law says that if you double the force you double the extension of a spring or something like a spring.

Question 10

Transparent

Answer 10

An object that lots most light through

Question 11

Translucent

Answer 11

An object that lets a bit of light through

Question 12

Opaque

Answer 12

An object that doesnt let light through

Question 13

Reflection

Answer 13

An object that light bounces off

Question 14

Refraction

Answer 14

An object that bends light

Question 15

Lens

Answer 15

The bit in your eye that refracts light onto your retna

Question 16

Iris

Answer 16

The coloured bit of your eye that help to move the pupil to expand and shrink

Question 17

Cornea

Answer 17

The protective layer around the eye

Question 18

Retina

Answer 18

The bit at the back of the eye that picks up light and puts it into images

Question 19

Pupil

Answer 19

The black bit in the middle of your eye that expands to let it light and shrinks to let in less light

Question 20

Compress

Answer 20

When you squish an object

Question 21

Extension

Answer 21

When you make stretch an object

Question 22

Elastic limit

Answer 22

If a spring is stretched more than its elastic limit it wont go back to its original form

Question 23

Balanced force

Answer 23

When a push and pull force are equal

Question 24

Unbalanced force

Answer 24

When one push or pull force is stronger than another push or pull force

Question 25

Weight

Answer 25

How much force you put onto the ground

Question 26

Streamlined

Answer 26

Making an object have less air resistance

Question 27

3 affects of forces

Answer 27

1. A force can move a stationary object
2. A force can change the speed of a moving object
3. A force can stop a moving object

Question 28

Tension

Answer 28

When something is stretched tightly

Question 29

Thrust

Answer 29

A type of propulsion force

Question 30

Upthrust

Answer 30

The upward thrust that keeps a boat from sinking

Question 31

Resultant force

Answer 31

The resultant force is the sum of both forces e.g

There was 40N pulling left and 50N pulling right that means that the resultant force is 10N to the right