Unit 1.2 Kinematics

Question 1

What is a x-t graph?

Answer 1

Displacement-time graph

Question 2

What does the gradient of a x-t graph represent?

Answer 2

The increase in displacement per second, so the gradient of a x-t graph is the velocity.

Question 3

Describe the gradient of a x-t graph if it is a straight line.

Answer 3

Gradient is constant and so the velocity is constant.

Question 4

What does an upward slope on a x-t graph represent?

Answer 4

An increase in x with time, so a movement in the positive x direction.

Question 5

What does a downward slope on a x-t graph represent?

Answer 5

Moving in the negative direction.

Question 6

What does a horizontal line represent on a x-t graph?

Answer 6

Stationary

Question 7

Define mean speed.

Answer 7

distance travelled/ time taken

Question 8

Define mean velocity.

Answer 8

displacement/ time taken

Question 9

Define instantaneous acceleration.

Answer 9

It is the rate of change of velocity.

Question 10

Define mean acceleration.

Answer 10

change in velocity/ time taken
Δv/ Δt

Question 11

Give the units of acceleration.

Answer 11

ms⁻²

Question 12

What does ‘rate of change’ mean?

Answer 12

Change per unit time

Question 13

Give a second definition for acceleration.

Answer 13

Change in velocity per second

Question 14

What is a v-t graph?

Answer 14

Velocity-time graphs

Question 15

What 2 quantities can be found by a v-t graph?

Answer 15

1. Acceleration
2. Displacement

Question 16

How can you find the acceleration in a v-t graph?

Answer 16

By working out the gradient of the v-t graph

Question 17

How can you find the displacement in a v-t graph?

Answer 17

By working out the area between the v-t graph and t-axis.

Question 18

What does x represent in suvat?

Answer 18

Displacement

Question 19

What does u represent in suvat?

Answer 19

Initial velocity

Question 20

What does v represent in suvat?

Answer 20

Final velocity

Question 21

What does a represent in suvat?

Answer 21

Acceleration

Question 22

What does t represent in suvat?

Answer 22

Time

Question 23

Give 2 equations used in suvat to work out the velocity.

Answer 23

1. v = u + at
2. v² = u² + 2ax

Question 24

Give 3 equations used in suvat to work out the displacement.

Answer 24

1. x = 1/2 (u + v) t
2. x = ut + 1/2 (at²)
3. x = vt - 1/2 (at²_

Question 25

What does g represent?

Answer 25

Acceleration of free fall or the acceleration due to gravity.

Question 26

Give the value for g.

Answer 26

9.81 ms⁻²

Question 27

What would the acceleration be if we choose upwards as positive?

Answer 27

a = -g = -9.81 ms⁻²

Question 28

What is a projectile?

Answer 28

An object which is thrown/ kicked/ made to move obliquely upwards and carries on its path under the influence of gravity.