3.4.1.3 - Motion Along A Straight Line

Question 1

V =

Answer 1

Change in displacement / change in time

Question 2

Acceleration =

Answer 2

Change in velocity / change in time

Question 3

What is instantaneous speed?

Answer 3

Speed given at any given point.

Question 4

What is the average speed?

Answer 4

Total distance divided by the total time.

Question 5

What does acceleration and deceleration look like on a displacement-time graph?

Answer 5

Curve down for deceleration, and a curve up for acceleration.

Question 6

What does stationary look like on a displacement-time graph?

Answer 6

Horizontal line.

Question 7

What does constant velocity look like on a displacement-time graph?

Answer 7

Straight line from the origin, diagonally upwards.

Question 8

What does negative velocity look like on a displacement-time graph?

Answer 8

Straight line down \

Question 9

How do you find the instantaneous velocity at a certain point on a displacement time graph?

Answer 9

Draw a tangent to the curve and then find its gradient using a triangle and change in y/change in x.

Question 10

Acceleration =

Answer 10

Change in velocity / time taken

Question 11

What does constant velocity look like on a velocity time graph?

Answer 11

Horizontal line.

Question 12

What does constant acceleration look like on a velocity time graph?

Answer 12

/

Question 13

What does decreasing acceleration look like on a velocity-time graph?

Answer 13

Curve downwards.

Question 14

What does increasing acceleration look like on a velocity-time graph?

Answer 14

Curve upwards.

Question 15

What does constant deceleration look like on a velocity-time graph?

Answer 15

\

Question 16

How do you find the displacement on a velocity-time graph?

Answer 16

The area underneath the graph.

Question 17

On a velocity time graph, what would be the shape of a bouncing ball?

Answer 17

Up and down above and below the 0 line.

Question 18

What are the advantages of using a data logger?

Answer 18

• More accurate as you don’t have to allow for human reaction times.
• Much higher sampling rate than humans as it can take readings up to ten times a second.
• You can see the data displayed in real time.

Question 19

What are the 4 uniform acceleration equations?

Answer 19

V = u + at
V^2 = u^2 + 2as
S = ut + 1/2at^2
S = (u+v)/2 x t

Question 20

What is free fall?

Answer 20

The motion of an object undergoing an acceleration of ‘g’.

Question 21

What is the only force acting on an object in free fall?

Answer 21

It’s weight.

Question 22

Describe an experiment to find g

Answer 22

1. Using a ball bearing an a trapdoor time how long it takes for the ball to reach the door using varying heights.
2. Use an electromagnet to release the ball bearing.
3. Use a switch to simultaneously start the time and release the ball.
4. Once you have obtained the results for varying h values plot a graph and calculate g using g = 2X (change in displacement/change in time squared)