Grand STEM Challenge 2023 for Physics - Preliminary Competition

"The change in velocity of an object divided by the time interval during which the change occurs."

The above statement refers to

• Average velocity

• Instantaneous velocity

• Average acceleration

• Instantaneous acceleration

• Average speed

Choose the incorrect statement regarding displacement.

• It is a vector quantity

• It is the algebraic sum of all distances in different directions

• Could be zero if the object returns to its initial position

• It is the shortest distance between the initial and final position of an object

The diagram shows the position of a car on the x-axis at various times. The car moves from A->B->C->D->E->F. Find the displacement and distance travelled between positions A and E

• Displacement=111 m Distance=-67 m

• Displacement=-67 m Distance=111 m

• Displacement=-67 m Distance=67 m

• Displacement=-37 m Distance=111 m

The graph in the diagram shows that the object experiences

• constant acceleration followed by zero acceleration

• increasing acceleration followed by constant acceleration

• linearly increasing displacement followed by constant displacement

• increasing velocity followed by zero velocity

The diagram shows the phenomenon of

• Time dilation

• Length contraction

• Relativity of simultaneity

• Einstein’s Postulates of Special Relativity

Choose the correct kinematics equation:

• Instantaneous speed

• Average speed

• Average velocity

• Instantaneous velocity

"The basic rules that govern how things work, like the laws of motion and the behaviour of light, are the same no matter how fast or in what direction you are moving, as long as you're not accelerating."

The above statement refers to

• Einstein's postulate that the laws of physics are the same in all inertial reference frames

• Einstein's postulate that the speed of light in a vacuum is always constant

• Relativity of simultaneity

• General theory of relativity

• Universal Law of Gravitation

When an object is moving relative to an observer, time appears to pass more _____ for the _____ compared to the _____.

• same; moving object; observer

• slowly; observer; moving object

• slowly; moving object; observer

• fastly; moving object; observer

"Different observers moving relative to each other may perceive the same events as happening at different times."

The above statement refers to

• Einstein's postulate of special relativity

• Length contraction

• Time dilation

• Relativity of simultaneity