Topic 5 - 2/2

Question 1

Draw a velocity time graph of a constant acceleration, steady speed, increasing acceleration, constant deceleration

Answer 1

Draw on book

Question 2

Draw a Distance time graph of steady speed, stop, accelerating and descelerating

Answer 2

Draw on book

Question 3

Define Terminal Velocity

Answer 3

Maximum speed

Question 4

Explain how a falling object will reach its terminal velocity (5marks)

Answer 4

When falling objects first fall, the force of gravity is much greater than the frictional force. As the speed of object increases, the the frictional force increases. This gradually reduces the acceleration of the object as the frictional force is equal to accelerating force so the resultant force is zero. Therefore it will have reached its max speed or terminal velocity

Question 5

What does terminal velocity depend on

Answer 5

Shape and Area

Question 6

How does air resistance affect terminal velocity

Answer 6

reduces terminal velocity ( max speed )

Question 7

What is Newtons First Law

Answer 7

A resultant force is needed to make something move

Question 8

What is Newtons Second Law

Answer 8

Acceleration is directly proportional to Resultant Force

Question 9

What is the formula for force

Answer 9

Force = Mass x Acceleration

Question 10

What is resultant force directly proportional to

Answer 10

acceleration

Question 11

What is Inertia

Answer 11

Inertia is the tendency for motion to remain unchanged so until acted upon by a resultant force, objects will stay at rest

Question 12

What does an objects inertial mass show

Answer 12

An objects Inertial mass shows how difficult it is to change the objects velocity

Question 13

What is the formula for inertial mass

Answer 13

Mass = Force / Area

Question 14

What is newtons Third law

Answer 14

When 2 objects interact, the forces they exert on each other are equal and opposite

Question 15

Summarise the Light Gate Method

Answer 15

This method proves newtons 2nd law. attach a trolley with as piece of card on it and mark on the table the starting position. attach a string on the trolley that goes over a pulley connected to masses which you change. once the masses are attached, release thr trolley and the light gate will record the acceleration of the trolley when released. to investigate the effect on mass, attach masses on the trolley

Question 16

What is the formula for stopping distance

Answer 16

SD = BD + TD (braking and thinking distance)

Question 17

Define Thinking Distance

Answer 17

The distance the car travels for the drivers reaction time

Question 18

Define Braking distance

Answer 18

The distance the car travels to stop under the braking force

Question 19

What is Thinking distance affected by

Answer 19

Speed of car
Reaction time

Question 20

What are 4 factors which affect your Braking distance

Answer 20

Speed of car
Conditions of tyre
Conditions of road
Condition of brakes

Question 21

Summarise the ruler drop test

Answer 21

This investigates your reaction time. Firstly sit with your arm resting on the table and get another person to hold a ruler in between your hand with the ruler lined with your hand at 0. without giving any warning, the person should drop the ruler and record the number where it is caught on.

Question 22

What is the formula for momentum

Answer 22

Momentum = Mass x Velocity

Question 23

Define conservation of momentum

Answer 23

When in a closed system, the total momentum before is equal to the total momentum after