Motion And Measuring 📏

Question 1

What 3 things are needed for 2 variables to be directly proportional?

Answer 1

1. The line of best fit should go through the origin on a graph.
2. Should be a straight line graph.
3. Should go up in the same amounts each time e.g every 1 hour the car travels 30 miles.

Question 2

How does the length of the pendulum affect the time taken for one swing?

Answer 2

The longer the string of the pendulum, the longer it takes to complete one oscillation (swing).

Question 3

State some practical results for how the length of the pendulum affects the time taken for one swing.

Answer 3

Length of string = 0.1m
Time for one swing = 0.76s

OR

Length of string = 1m
Time for one swing = 1.978s

Question 4

Why is the simple pendulum useful for time keeping?

Answer 4

Because it is isochronus (swings in the same time intervals).
ALSO a demonstration of Newton’s First Law!! (Because it is moving at a constant speed-isochronus-so the forces acting on it must be balanced)

Question 5

What is the formula for constant speed?

Answer 5

Speed = distance ÷ time.

Question 6

What is the formula for average speed?

Answer 6

Average speed = total distance ÷ time taken.

Question 7

State the correct units for speed.

Answer 7

Km/h (kilometres per hour), m/h (miles per hour), m/s (metres per second).

Question 8

Which goes on the x axis in a distance-time graph: distance or time?

Answer 8

• Time goes on the x axis.
• Distance goes on the y axis.

Question 9

What does it mean if a distance time graph has a really steep line?

Answer 9

It is accelerating/going fast because there is less time taken compared to the amount of distance travelled.