Motion

Question 1

What does a straight line going upwards represent on a displacement- time graph?

Answer 1

Constant velocity

Question 2

What does a curving upwards shape on a displacement- time graph represent?

Answer 2

Constant acceleration

Question 3

What does a horizontal (flat) line represent on a displacement- time graph?

Answer 3

Stationary
- the gradient = 0 as the average velocity of the object is also 0

Question 4

speed

Answer 4

tate of change of distance

Question 5

displacement

Answer 5

vector distance travelled in a given direction

Question 6

velocity

Answer 6

rate of change of distance or speed

Question 7

acceleration

Answer 7

rate of change of velocity

Question 8

straight horizontal line on a displacement-time graph?

Answer 8

stationary object

Question 9

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

Answer 9

object moving with constant velocity

Question 10

curved line on a displacement time graph

Answer 10

acceleration/deceleration

Question 11

straight horizontal line on velocity time graph

Answer 11

constant velocity

Question 12

constant non zero gradient on a velocity-time graph

Answer 12

acceleration/deceleration

Question 13

area under velocity time

Answer 13

displacement

Question 14

area under acceleration time graph

Answer 14

velocity

Question 15

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

Answer 15

• set up gates vertically and measure distance between them
• connect them to a data logger and then release an object from rest above them, measuring time taken for object to travel between
• use time and known distance to calculate velocity

Question 16

describe how light gates can investigate conservation of momentum

Answer 16

• place two carts on a linear air track (to reduce friction) with repelling magnets so they don’t stick together
• attach card to top of each cart so they break the beams of the light gates when they pass
• keep one cart stationary and push the other towards it measuring the velocity before the collision
• measure both carts velocity after collision
• calculate momentum

Question 17

define g

Answer 17

• the acceleration of free fall
• acceleration of an object in response to gravitational attraction between earth and the object

Question 18

describe the experiment to determine g using an electromagnet

Answer 18

• electromagnet holds a steel ball suspended above a measured distance, above a surface
• start timer when the electromagnet is deactivated, and stop when the ball hits the surface
• s = ut + 1/2at^2
• a = g