1.1 - basic physics

Question 1

Mass SI unit?

Answer 1

kg

Question 2

Length SI unit?

Answer 2

m

Question 3

Time SI unit?

Answer 3

s

Question 4

Electrical current SI unit?

Answer 4

A

Question 5

Temperature SI unit?

Answer 5

K

Question 6

Amount of a substance SI unit?

Answer 6

mol

Question 7

F=MA in base units?

Answer 7

N=kgms^-2

Question 8

Homogeneous?

Answer 8

Units for both sides of the equation are the same.

Question 9

Scalar?

Answer 9

Magnitude only (mass, temperature etc…)

Question 10

Vector?

Answer 10

Magnitude and direction (force, acceleration, displacement etc…)

Question 11

Density?

Answer 11

Mass per unit volume.

Question 12

Equation for density?

Answer 12

p=m/v

Question 13

Magnitude of resultant force?

Answer 13

Pythagoras theorem.

Question 14

Direction of resultant force?

Answer 14

Trigonometry.

Question 15

Moment/torque?

Answer 15

A turning effect of a force about a point.

Question 16

Moment/torque equation?

Answer 16

Moment= force x perpendicular distance to the force

Question 17

Principle of moments?

Answer 17

Clockwise moments and anticlockwise moments must be equal in magnitude, and the resultant force must be zero for an object to be in equilibrium.

Question 18

Coplanar vectors are vectors acting on the same ??? as each other.

Answer 18

Plane.

Question 19

Centre of gravity?

Answer 19

Gravity acting at one point only with a force equal to the weight of the object.

Question 20

Conditions for equilibrium?

Answer 20

-No resultant force in any direction.
-No net moment about any point.