motion and pressure (IMPORTANT!)

Question 1

acceleration

Answer 1

The amount by which speed increases in one second.

Question 2

atmospheric pressure

Answer 2

the pressure acting on us from the air around us.

Question 3

average speed

Answer 3

The total distance travelled in the total time taken for a complete journey.

Question 4

centre of gravity

Answer 4

The point in an object where the force of gravity seems to act.

Question 5

centre of mass

Answer 5

The point in an object where the mass of an object seems to act.

Question 6

compressed

Answer 6

Squashed into a smaller space.

Question 7

density

Answer 7

The mass of a material in a certain volume.

Question 8

distance-time graph

Answer 8

A graph that shows how far an object moves each second.

Question 9

gas pressure

Answer 9

The force produced by air particles when they collide with a surface.

Question 10

incompressible

Answer 10

Cannot be compressed (squashed)

Question 11

instantaneous speed

Answer 11

The speed at a particular moment.

Question 12

law of moments

Answer 12

An object is in equilibrium if the clockwise moments equal the anticlockwise moments.

Question 13

liquid pressure

Answer 13

The pressure produced by collisions of particles in a liquid.

Question 14

metres per second

Answer 14

A unit of speed

Question 15

moment

Answer 15

A measure of the ability of a force to rotate an object on a pivot.

Question 16

newton metres

Answer 16

The unit of moment

Question 17

newtons per metre squared

Answer 17

A unit of pressure

Question 18

pivot

Answer 18

The point of balance (e.g in a lever or seesaw)

Question 19

pressure

Answer 19

A force exerted on a certain area.

Question 20

relative motion

Answer 20

The difference between the speeds of two objects.

Question 21

speed

Answer 21

A measure of how far something travels in a given time

Question 22

equation for speed

Answer 22

speed = distance(m)/ time (s)

Question 23

equation for pressure

Answer 23

pressure = force (N) / area (m^2)

Question 24

equation for moments

Answer 24

moment (Nm) = force (N) × perpendicular distance
from the pivot (m)