SECTION A MECHANICS QUESTIONS Flashcards Preview

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Flashcards in SECTION A MECHANICS QUESTIONS Deck (3)
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1

Power can be defined as
(A) force x distance moved
(B) force/time
(C) work done/time
(D) work done x time

(D) work done x time

2

The measurement of the external diameter of a measuring cylinder is MOST accurately done by using a
(A) metre rule
(B) tape measure
(C) length of string
(D) pair of vernier calipers

(D) pair of vernier calipers

3

A sprinter of mass 55 kg was running a 100 m race. Her velocity was measured at different intervals of a 11.0 s period. The results are recorded in Table 1.

Define the term ‘velocity’.
Acceleration is defined as the rate of change of

Using the grid provided, plot a graph of velocity, v/ms–1 against time, t/s.

Determine the slope of the graph over the first 7.0 s of the race.

State the physical quantity relating to the motion of the sprinter which the slope of the graph represents.

Describe the sprinter’s motion from 8 s to 10 s.

Calculate the resultant force acting on the sprinter after 7.0 s.

Velocity is the the displacement of an object per unit time.

Acceleration is defined as the rate of change of velocity per unit time.

velocity on y-axis
time on x-axis

1. Draw triangle
2. Derive units

acceleration (because m/s^2 is the unit for acceleration)

Between 8 s to 10 s the sprinter is moving with a constant velocity of 10 m/s

F = ma