Topic 3 Kinematics

Question 1

What are scalar quantities.

Answer 1

They only have magnitude

Question 2

What are vector quantities?

Answer 2

They both have magnitude and direction.

Question 3

What is the formula for velocity?

Answer 3

Change in displacement/time
V = /\s / /\t

Question 4

What is the formula of acceleration?

Answer 4

Change in velocity/time
a = /\v / /\t

Question 5

What are the three types of graph that can represent motion?

Answer 5

Displacement-time graphs, velocity-time graphs and acceleration-time graphs

Question 6

What does the y-intercept represent in a displacement-time graph?

Answer 6

It equals the initial displacement

Question 7

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

Answer 7

This represents constant velocity

Question 8

What does a positive slope represent in a displacement-time graph?

Answer 8

It represents motion in the positive direction

Question 9

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

Answer 9

It represents acceleration

Question 10

What does a straight line represent in a displacement-time graph?

Answer 10

A horizontal line represents a state of rest

Question 11

What is the difference between a distance-time graph and a displacement-time graph?

Answer 11

A displacement-time graph can have a positive or negative value but a distance-time graph.

Question 12

What does a slope represent in a velocity-time graph

Answer 12

Slope represents acceleration

Question 13

What does the y-intercept represent in a velocity-time graph

Answer 13

The y-intercept equals the initial

Question 14

What does a straight line represent in a velocity-time graph

Answer 14

It represents uniform acceleration

Question 15

What does a positive slope represent in a velocity-time graph

Answer 15

An increase in velocity (acceleration) in the positive direction.

Question 16

What does a curved line represent in a velocity-time graph

Answer 16

It represents the non-uniform acceleration.

Question 17

What does a horizontal line (zero slope) represent in a velocity-time graph

Answer 17

It represents motion with constant velocity

Question 18

What does a the area under the curve represent in a velocity-time graph

Answer 18

It equals the displacement or distance travelled

Question 19

Difference between a velocity-time graph or speed-time graph

Answer 19

The velocity-time graph can have a positive or negative values on the displacement axis. However, a speed-time graph only has positive.

Question 20

What does the y-intercept represent in an acceleration-time graph

Answer 20

It equals the initial acceleration

Question 21

What does a horizontal line (zero slope) represent in an acceleration-time graph?

Answer 21

An object undergoing constant acceleration.

Question 22

What does the area under the curve equal in an acceleration graph

Answer 22

It equals the change in velocity

Question 23

What does the velocity equal in a displacement-time graph?

Answer 23

The gradient of a displacement-time graph

Question 24

For a bouncing ball, when does the velocity change?

Answer 24

Since it changes direction at the highest and lowest point, the velocity changes.

Question 25

What are the 4 us at equations?

Answer 25

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

Question 26

What does start in rest mean in a question?

Answer 26

It means that u=0 and t=0 if both are not mentioned in the question

Question 27

What does the acceleration of free fall mean?

Answer 27

The acceleration of free fall ,g, is defined as the acceleration of any object in response to the gravitational attraction between the Earth and the object.

Question 28

What is the stopping distance of a car?

Answer 28

The distance it travels in the time it takes to stop in response to an emergency.

Question 29

What is the equation of stopping distance?

Answer 29

Thinking distance + braking distance

Question 30

The thinking distance is proportional to the s

Answer 30

Speed

Question 31

Thinking distance definition

Answer 31

The distance travelled by the vehicle from when the driver sees a problem and the brakes are applied.

Question 32

Thinking distance formula

Answer 32

Thinking distance = initial speed x reaction time

Question 33

Factors that affect thinking distance

Answer 33

- The initial speed of the vehicle - Intoxication - Distractions (mobile phones) - Tiredness

Question 34

Braking distance defined as

Answer 34

The distance travelled by the vehicle after the driver has applied the brake

Question 35

Work done formula with braking distance

Answer 35

Work done = braking force x braking distance = 1/2 mv^2 kinetic energy equation

Question 36

Factors that affect braking distance

Answer 36

- The initial speed of the vehicle - Mass of the vehicle - Poor road conditions - Poor car conditions

Question 37

What components do projectile motion have?

Answer 37

A horizontal and vertical component

Question 38

Time of flight def

Answer 38

How long the projectile is in the air

Question 39

Maximum height attained def

Answer 39

The height at which the projectile is momentarily at rest.