Chapter 3: Motion

Question 1

speed

Answer 1

rate of change of distance, ms-1

Question 2

displacement

Answer 2

distance an object has travelled in a given direction

Question 3

velocity

Answer 3

rate of change of displacement, or speed in a given direction, vector, ms-1

Question 4

acceleration

Answer 4

rate of change of velocity, vector, ms-2

Question 5

what does a straight horizontal line represent on a displacement-time graph?

Answer 5

stationary object

Question 6

what does a line with a constant, non-zero gradient represent on a displacement-time graph?

Answer 6

moving with constant velocity

Question 7

What does a curved line represent on a displacement-time graph?

Answer 7

acceleration or deceleration

Question 8

what does a straight horizontal line represent on a velocity-time graph?

Answer 8

object moving with constant velocity

Question 9

what does a line with a constant non-zero gradient represent on a velocity-time graph?

Answer 9

acceleration or deceleration

Question 10

what does the area under a velocity-time graph represent?

Answer 10

displacement

Question 11

what does the area under an acceleration-time graph represent?

Answer 11

velocity

Question 12

describe how terminal velocity of an object can be determined using light gates

Answer 12

• set up light gates vertically and measure distance between them
• connect them with a data logger and release object from rest, measuring time taken to travel between two gates
• usually the time and the known distance, you can calculate the velocity of the falling object

Question 13

define ‘g’

Answer 13

acceleration of free fall, acceleration of an object in response to gravitational attraction

Question 14

experiment to calculate the value of g

Answer 14

• electromagnet holds a steel ball suspended at a measured distance above a surface
• start timer when the electromagnet is deactivated, stop when the surface is hit
• u=0 and distance and time is known so use SUVAT equation s = ut + 1/2 at2

Question 15

does horizontal velocity change in projectile motion?

Answer 15

no

Question 16

what is vertical acceleration in projectile motion?

Answer 16

gravitational field strength downwards