Exam Practice

Question 1

A force is defined as

Answer 1

A push or a pull

Question 2

A force is represented using

Answer 2

an arrow

Question 3

Using an arrow is useful because

Answer 3

it shows both the magnitude or size of the force and also the direction

Question 4

Usually we consider forces in one direction (to the right) to be ____ and forces in the opposite to be ______

Answer 4

positve negative

Question 5

A force is measured in ____ using a ____

Answer 5

newtons
newtons meter

Question 6

What is gravity

Answer 6

Pulls things downward and acts toward the centre of the earth

Question 7

What is friction

Answer 7

Acts agains the motion of an object

Question 8

What is air friction

Answer 8

Another form of friction, acts on objects as they move through the earths atmosphere

Question 9

What happens to the object when forces act depends on what two things

Answer 9

Size of the forces
Direction of the forces

Question 10

When more than one force acts on an object the forces combine to form a ____ or ______

Answer 10

Net force
Resultant

Question 11

If all forces acting on an object are balance the object will either

Answer 11

Remain at rest
Travel at a constant speed/velocity

Question 12

Unbalanced forces cause an object to

Answer 12

speed up, slow down or change direction

Question 13

Mass is

Answer 13

the amount of substance in an object

Question 14

Mass is measured in

Answer 14

Grams or kilograms

Question 15

Mass depends on

Answer 15

the size of the atoms that make up a substance and the way atoms are packed together

Question 16

Mass is measured using

Answer 16

mass balance or scales

Question 17

The weight of an object is

Answer 17

The force of gravity acting on it

Question 18

Weight is measured in

Answer 18

Newtons

Question 19

Weight is measured using

Answer 19

Newton Balance

Question 20

Formula for weight

Answer 20

W = m x g

Question 21

Friction is

Answer 21

A force which always acts to oppose the motion of an object

Question 22

friction occurs as a result of

Answer 22

2 surfaces rubbing against eachother

Question 23

When examined under a microscope even the smoothest surfaces appear

Answer 23

rough

Question 24

The rougher the surface the ____ the force of friction

Answer 24

greater

Question 25

Friction is always a nuisance, why?

Answer 25

it converts useful energy into waste energy e.g. (heat and sound)

Question 26

Examples of friction for our safety

Answer 26

Wheel treads, grips on shoes, spikes on boots etc

Question 27

formula for gradient

Answer 27

gradient = change in y / change in x

Question 28

The density is defined as

Answer 28

the mass of 1cm3 of a material

Question 29

Density is ________ for a specific material

Answer 29

constant

Question 30

The density of water is

Answer 30

1g/cm3

Question 31

Equation for mass of liquid

Answer 31

Final mass - initial mass

Question 32

a solid has a high or low density

Answer 32

high

Question 33

A liquid has a high or low density than a solid

Answer 33

Lower than a solid

Question 34

a gas has a high or low density

Answer 34

low

Question 35

When heat is applied to a solid the particles gain ____ energy and hence ____ more

Answer 35

kinetic vibrate

Question 36

When solids are heated their density ________

Answer 36

decreases as the distance between particles increases and hence occupy a larger volume but their mass remains constant

Question 37

When a liquid evaporates or boils the density _____ further. the intermolecular spacing _____ and the volume ________

Answer 37

decreases increases increases

Question 38

When a weight is attached to a spring it __________

Answer 38

extends

Question 39

the extension is

Answer 39

difference between the new length and the original