Physics: Forces, motion and density (10)

Question 1

Which of these would you use to measure area? m, cm2, g or km

Answer 1

cm2. The 2 should be little and above the m. It stands for squared because we would use square pieces of paper to find the area.

Question 2

What is measured in centimetres cubed? (cm3)

Answer 2

Volume

Question 3

What is the relationship between distance, speed and time?

Answer 3

Distance= speed x time Dead Smelly Turtle triangle.

Question 4

What is the unit of force? What is force measured in?

Answer 4

Newtons

Question 5

What is used to measure force?

Answer 5

A force meter or newton meter

Question 6

What effects the weight of an object?

Answer 6

Its mass (amount of stuff in it) and the force of gravity.

Question 7

If all forces on an object are balanced what do we know about the object?

Answer 7

It is still or moving at a constant speed.

Question 8

What will unbalanced forces cause an object to do?

Answer 8

Change direction or speed. This might mean start or stop moving.

Question 9

What does frictional force do to the movement of an object?

Answer 9

Slow it down

Question 10

What can we do to reduce air resistance/ drag (a frictional force) on an object?

Answer 10

streamline designs

Question 11

When is friction useful?

Answer 11

When grip is required, e.g. a tyre on the road, on soles of shoes.

Question 12

Friction can be a problem in engines as it wastes energy and causes things to get hot? How can friction be reduced?

Answer 12

Lubrication / oil

Question 13

A turning force can result in an object rotating around a point. What name do we give to this point?

Answer 13

Pivot

Question 14

Give some examples of where levers are used to increase a force or change the direction of a force.

Answer 14

crowbar, pliers, scissors

Question 15

What is the relationship between force, pressure and area?

Answer 15

Force = pressure x area (Fat pigs arse triangle)

Question 16

What is the unit for pressure?

Answer 16

Newtons per metre squared (N/m2) or Newtons per centimetre squared (N/cm2)

Question 17

How do snowshoes or skis stop you sinking in the snow?

Answer 17

They spread your mass over a larger area meaning less pressure on the snow. The opposite of this is why ladies in stilettoes sink in the mud.

Question 18

What is the density of a material?

Answer 18

A measure of how tightly packed the particles are.

Question 19

What is the relationship between density, mass and volume?

Answer 19

Mass = volume x density (My Dog Vomits triangle)

Question 20

What is the volume of an object?

Answer 20

The amount of space it takes up

Question 21

What is the unit of density?

Answer 21

Grams per metre cubed (g/m3) or grams per centimetre cubed (g/cm3)

Question 22

How do you find the mass of an object?

Answer 22

Put it on some scales (balances) or multiply the density by the volume

Question 23

How do you find the volume of a regular shaped solid, like a cuboid?

Answer 23

Length x width x height

Question 24

How do you find the volume of an irregular shaped solid?

Answer 24

Using a Eureka /displacement can and a measuring cylinder

Question 25

Does air have mass?

Answer 25

Yes, because it has particles in it.

Question 26

Pressure is sometimes measured in pascals (Pa). What is one pascal equal to?

Answer 26

One Newton per metre squared. (1N/m2)

Question 27

What type of switch is this?

Answer 27

SPDT switch, used to switch between two different circuits.