C3 (Motion)

Question 1

Average speed equation

Answer 1

Total Distance travelled/ total time taken

Question 2

What does the gradient in a distance time graph represent

Answer 2

Speed

Question 3

Instantaneous speed

Answer 3

Is the speed of the car over a very short interval of time

Question 4

How to find instantaneous speed

Answer 4

Draw a tangent at the point

The gradient is the instantaneous speed

Question 5

Equation for average velocity

Answer 5

Change in displacement/ time taken

Question 6

In a displacement time graph what does the gradient represent

Answer 6

Velocity

Question 7

Acceleration definition

Answer 7

The rate of change of velocity

Question 8

Acceleration definition

Answer 8

a= change v/ change t

Question 9

What does the gradient of a velocity time graph represent

Answer 9

Acceleration

Question 10

What does the gradient of a velocity time graph represent

Answer 10

Acceleration

Question 11

How do u find the displacement of a velocity time graph

Answer 11

Area underneath the graph

Question 12

Stopping distance

Answer 12

The total distance travelled between the moment when you first see a reason to stop, to when the vehicle CK es to a stop

Question 13

Thinking distance

Answer 13

The distance travelled between the moment you first see a reason to stop, to the moment you apply the brakes

Question 14

Braking distance

Answer 14

Distance travelled from the time the brake is applied until the vehicle stops

Question 15

Many factors influence these distances

Answer 15

Speed of vehicle
Condition of brakes
Tyres 
Road 
Weather conditions
Alertness of the driver

Question 16

Equation of thinking distance

Answer 16

Speed x Reaction time

Question 17

Free fall definition

Answer 17

When an object is accelerating under gravity, with no other forces acting on it, it is said to be in free fall

Question 18

What does the value of g depend on

Answer 18

Altitude
Latitude
Geology of an area

Question 19

What are three different ways of measuring the value of g

Answer 19

Electromagnet and trap door
Light gates
Taking pictures

Question 20

Projectile motion, assuming that there is no air resistance, what can be stated?

Answer 20

The vertical velocity changes due to acceleration of free fall
The vertical displacement and time of flight can be calculated using the equations of motion
Horizontal velocity remains constant

Question 21

What are the two types of friction

Answer 21

Contact and fluid friction

Question 22

How does an increase in speed affect the value of friction

Answer 22

It also increases

Question 23

What can the force friction never do

Answer 23

Speed things up or start something moving

Question 24

What does friction convert kinetic energy into?

Answer 24

Heat

Question 25

What decreases terminal velocity

Answer 25

The SA of the falling object

Question 26

A moment

Answer 26

Is the turning effect of a force

Question 27

What does the moment or torque depend on

Answer 27

Force being applied

And it’s distance from the pivot

Question 28

Moments must be balanced or…

Answer 28

The objects will turn

Sum of clockwise moments = sum of anticlockwise moments

Question 29

Muscles, bones and joints all act as what?

Answer 29

Levers

Question 30

What is a couple

Answer 30

Pair of forces of equal size which act parallel to each other, but in opposite directions

Question 31

What does the torque depend on

Answer 31

The size of the forces and the distance between them