Describing Motion Practice Questions

Which row of the table is correct for both distance and momentum?

	distance	momentum
A	scalar	scalar
B	scalar	vector
C	vector	scalar
D	vector	vector

State what is meant by a scalar quantity.

Explain why mass is a scalar quantity but weight is a vector quantity.

Which of these is closest to the typical speed of sound in air?

A $3\ \mathrm{m/s}$

B $33\ \mathrm{m/s}$

C $330\ \mathrm{m/s}$

D $3300\ \mathrm{m/s}$

The charity walk is $1.5\ \mathrm{km}$ long.

Estimate the time it takes the student to complete the walk.

Use a typical speed for a person walking.

time = .............................................................. s

Calculate the average speed of the cyclist in $\mathrm{m/s}$.

average speed = .............................................................. $\mathrm{m/s}$

Suggest why the speed of the cyclist at a particular moment during the ride may be different from the value calculated in part (a).

Describe the motion of the student during section B.

Calculate the speed of the student during section A.

speed = .............................................................. $\mathrm{m/s}$

State which section, A or C, shows the greater speed. Give a reason for your answer.

Calculate the acceleration of the tram during the first $20\ \mathrm{s}$.

acceleration = .............................................................. $\mathrm{m/s^2}$

Calculate the total distance travelled by the tram in the $80\ \mathrm{s}$ shown on the graph.

distance = .............................................................. m

Compare the magnitude of the tram's deceleration at the end of the journey with the magnitude of its acceleration at the start. Give a reason for your answer.

Calculate the acceleration of the ball while it is in contact with the racket.

acceleration = .............................................................. $\mathrm{m/s^2}$

The acceleration of an object in free fall is $g$.

Calculate how many times greater the acceleration of the tennis ball is than $g$.

number of times = ..............................................................

Calculate the speed of the aeroplane as it leaves the ground.

Use an equation selected from the list of equations at the end of this paper.

speed = .............................................................. $\mathrm{m/s}$

Calculate the time taken for the aeroplane to travel along the runway.

time = .............................................................. s

When landing, the aeroplane touches down at $75\ \mathrm{m/s}$ and comes to rest in $25\ \mathrm{s}$.

Calculate the deceleration of the aeroplane.

deceleration = .............................................................. $\mathrm{m/s^2}$

Calculate the speed of the trolley as it passes through the light gate.

speed = .............................................................. $\mathrm{m/s}$

Another student times the trolley over the same short distance using a stopwatch.

Explain why the light gate method gives a more accurate value for the speed.

Describe one other way the student could improve the reliability of the results of this investigation.

Calculate the speed of the athlete.

speed = .............................................................. $\mathrm{m/s}$

Explain why the athlete is not running with a constant velocity.

State the magnitude of the athlete's displacement after one complete lap.

Calculate the total time for the journey, including the stop.

total time = .............................................................. s

Calculate the average speed of the van for the whole journey.

average speed = .............................................................. $\mathrm{m/s}$

State how the $300\ \mathrm{s}$ stop would appear on a distance/time graph of the journey.

Calculate the speed of the stone as it hits the water.

Use an equation selected from the list of equations at the end of this paper.

speed = .............................................................. $\mathrm{m/s}$

Calculate the time taken for the stone to fall to the water.

time = .............................................................. s

In practice, the stone hits the water at a slightly lower speed than the value calculated in part (a).

Explain why.

Sketch the velocity/time graph for this journey on the grid below.

Calculate the total distance travelled by the cyclist during the $60\ \mathrm{s}$ journey.

distance = .............................................................. m