Deck 1: Basics, and Statics

Question 1

Decide whether each of these statements is True (T) or False
For uniformly accelerated motion in a straight line, the velocity v after a time t is given by v = u + at, where
U is the initial velocity, a the acceleration and t the time.
(i) If we multiply the velocity v by 5 then we must multiply u by 5 and at by 5.
(ii) If the unit of v is m/s then the unit of at must be m/s.

A) (i) T (ii) T
B) (i) T (ii) F
C) (i) F (ii) T
D) (i) F (ii) F

Answer 1

A

Question 2

Decide whether each of these statements is True (T) or False
The kinetic energy E of an object of mass m moving with a velocity v is given by E = ½mv2.
(i) For a constant mass, doubling the velocity doubles the energy.
(ii) The unit of the energy is the unit of mass multiplied by the square of the unit of the velocity.

A) (i) T (ii) T
B) (i) T (ii) F
C) (i) F (ii) T
D) (i) F (ii) F

Answer 2

C

Question 3

Decide whether each of these statements is True (T) or False
The value 1050.2 kg can be expressed as:
(i) 10 502 g
(ii) 1.050 20 Mg

A) (i) T (ii) T
B) (i) T (ii) F
C) (i) F (ii) T
D) (i) F (ii) F

Answer 3

C

Question 4

A voltmeter is quoted as having an accuracy of ±3% f.s.d. on the 0 to 5 V scale. The error in a reading of
2 V will be:

A) ±0.02 V
B) ±0.03 V
C) ±0.06 V
D) ±0.15 V

Question 5

Decide whether each of these statements is True (T) or False
The equation 2R = 6I + 8 describes a straight line graph between R and I with:
(i) A gradient of 6.
(ii) An intercept on the R axis of 8.

A) (i) T (ii) T
B) (i) T (ii) F
C) (i) F (ii) T
D) (i) F (ii) F

Question 6

A force of 4.0 N at an angle of 30º to the horizontal has a vertical component of:

A) 2.0 N
B) 2.3 N
C) 3.5 N
D) 6.9 N