Distance, speed and acceleration.

Question 1

What is acceleration?

Answer 1

The rate of change of velocity measured in metres per second squared.

Question 2

What is distance?

Answer 2

Measured in metres, its how far an object travels or how far away an object is from a fixed point.

Question 3

What is time?

Answer 3

Measured in seconds, it is the time interval between 2 events or the time since the start of the motion.

Question 4

What is speed?

Answer 4

Measured in metres per second, it is a measure of how fast or slow the object is moving.

Question 5

What is the equation that links speed?

Answer 5

Speed = distance/time

Question 6

What is velocity?

Answer 6

Measured in metres per second in a given direction, a measure of how fast or slow the object is moving in a given direction (eg north/south, left/right).

Question 7

What is the equation regarding acceleration?

Answer 7

Acceleration or deceleration = change in velocity/time

Question 8

What type of quantity is speed?

Answer 8

Speed is a scalar quantity because it only has magnitude.

Question 9

What type of quantity is velocity?

Answer 9

Velocity is a vector quantity because it has direction as well as magnitude.

Question 10

What are the 2 types of motion graphs?

Answer 10

Distance/time and velocity/time graphs.

Question 11

What does a distance/time graph allow us to do?

Answer 11

Measure the speed of a moving object.

Question 12

How are stationary objects represented in distance time graphs?

Answer 12

As a horizontal line.

Question 13

What does the gradient of a velocity time graph show us?

Answer 13

The gradient is the acceleration of the object.

Question 14

How do you find the distance travelled in a velocity/time graph?

Answer 14

The area under the velocity time graph.

Question 15

What is total stopping distance made up of?

Answer 15

Thinking distance and braking distance.

Question 16

What is thinking distance?

Answer 16

The distance the vehicle travels while the driver sees the hazard, thinks about braking and then actually reacts by braking.

Question 17

What is braking distance?

Answer 17

The distance the vehicle moves while the brakes are applied and the vehicle is decelerating to 0 m/s.

Question 18

Factors effecting thinking distance?

Answer 18

• The velocity of the car
• The awareness of the driver, if they are under any influences.
• The reaction time of the driver.

Question 19

Factors effecting braking distance?

Answer 19

• The velocity and mass of the car.
• The conditions of the brakes.
• The conditions of the tires.
• The condition of the roads.
• The weather.

Question 20

How do you minimise injuries on occupants in a sudden stop?

Answer 20

Reduce the forces acting on them, increase the time of the collision.

Question 21

What is the equation regarding Newton’s second law?

Answer 21

resultant force = change in momentum/ time for change.

Question 22

How do you reduce the force on an occupant?

Answer 22

Reducing the speed of the collision, so reducing the change in momentum.
Increasing the time of the collision.

Question 23

How do certain safety features on cars increase times of a collision?

Answer 23

Allowing something to be deformed.

• seat belts stretch
• airbags slowly deflate
• crumple zones crumple in on themselves

Question 24

What are the 2 main traffic control features that control speed?

Answer 24

Speed bumps and speed limits