Interactions (force)

Question 1

What is a force

Answer 1

A force is oush or pull acting on an object. Forces act in opposite ways.

Question 2

What is a contact force

Answer 2

A contact force is something that happens from physical contact with it

Question 3

What is a non-contact force

Answer 3

A non-contact force is when an object moves without any physical contact

Question 4

What are Balanced forces

Answer 4

When two forces acting on an object are equal in size but act in opposite directions.

Question 5

What are unbalanced forces

Answer 5

When two forces acting on an object are not equal in size.

Question 6

How do you measure forces

Answer 6

You get a newton meter measured in newtons (N)

Question 7

How do you use a newton meter

Answer 7

1. Hang the object on the hook of the newton meter
2. Pull at a constant speed and measure how much newtons it is.

Question 8

What is friction

Answer 8

Friction is a force that acts when two objects rub together. When the two objects appear to be smooth, there is less friction. When two objects are rough, there is a greater amount of friction.

Question 9

What is air resistance

Answer 9

Air resistance is a drag force. Drag forces slow things down. As an object moves through the air you are moving the air particle out of the way.

Question 10

What is water resistance

Answer 10

Water resistance is the same as air resistance but with water as you push through the water particles

Question 11

What is streamlining

Answer 11

Shaping an object to go though the air or water particles easier

Question 12

What are the pros of having something streamlined

Answer 12

For a vehicle it can move faster but also reduce its fuel consumption

Question 13

What are some examples of when we reduce friction

Answer 13

Skiers wax the bottom of their skis to reduce friction between the snow, ice skaters sharpen their skates to reduce the area of metal in contact with the ice.

Question 14

How else can we reduce friction

Answer 14

A smaller surface area can reduce friction

Question 15

True or false. The pointier the shape of the object the faster it goes down a tube of water

Answer 15

True

Question 16

How do you calculate speed

Answer 16

Distance divided by time

Question 17

How do you calculate time

Answer 17

Distance divided by speed

Question 18

How do you calculate distance

Answer 18

Speed times by time

Question 19

What is the triangle to measure speed, distance or time

Answer 19

Distance on top, speed to the left and time to the right

Question 20

Define density in particles

Answer 20

How tightly the particles are in an object

Question 21

What is the same in two objects but the particles are differently spread out (density)

Answer 21

The size and the number of particles

Question 22

What is the difference in two objects but the particle are differently spread out (density)

Answer 22

The space of particles makes the one with particles together making them more dense and lesser volume and the one with particles spread out less dense and larger volume

Question 23

Would a more dense object sink or float compared to a less dense object

Answer 23

The more dense would sink

Question 24

How do you calculate density

Answer 24

Mass divided by volume = density

Question 25

What is the unit for density

Answer 25

Whatever the mass unit is / whatever the volume unit is cubed

Question 26

How do you get the volume of a weirdly shaped object

Answer 26

Put it in water and measure the amount of water that fell out or how much it risen

Question 27

How do you calculate pressure

Answer 27

Force ( newtons ) divided by area ( cm squared or m squared )

Question 28

How do you define pressure

Answer 28

The amount of force on a certain area

Question 29

What is the unit for pressure

Answer 29

Newtons / what ever the unit is for area squared

Question 30

Define mass and weight

Answer 30

Mass is literally how heavy you are but weight is your pull of gravity.

Question 31

How do you get newtons from mass

Answer 31

Mass x 10 = Newtons

Question 32

What is air pressure in a balloon

Answer 32

Air pressure in a balloon is when particles bang on the wall of the balloon. So the area of which the particles bang on is the pressure on tge balloon

Question 33

What will happen if you suck all the air out of a container when something like a marshmallow is in it

Answer 33

So pressure is high on the inside and low on the outside. All the air inside the marshmallow will want to equal the air pressure by escaping the marshmallow making the marshmallow inflate as all the particles are trying to get out.

Question 34

What will happen to the marshmallow if it is in a container and all the air is out of it and you let air go back in.

Answer 34

Pressure is high on the outside and low on the inside. The particles are now trying to equal out the pressure by trying to get in the marshmallow resulting in it shrivelling up.

Question 35

If you put ice on a wood and ice on the metal which one would melt first and why

Answer 35

The metal one because metal is a conductor and it takes in the heat from the room and then meats the ice.

Question 36

Why does heat energy transfer only work through solids

Answer 36

Because the particles are compact and they vibrate when energy is on them and so they bump into each other and transferring the heat

Question 37

What is conduction heat transfer

Answer 37

It is heat transfer that when conductors have heat and and they pass along the heat by the particles vibrating because of the energy and bumping into each other transferring the heat

Question 38

What is convection heat transfer

Answer 38

It is when water or gas is heated up by the bottom in a container and so the liquid or gas is getting energy to the bottom half of the liquid or gas and so it rises because it is less dense but as it goes up it gets colder giving less energy and so more dense and so it goes back down

Question 39

What is radiation heat transfer

Answer 39

Radiation heat transfer is when electromagnetic waves travel from the sun to the earth not by using particles. It can also happen from radiators or a fireplace.