P10

Question 1

What is Newton’s 2nd law

Answer 1

The acceleration of an object is proportional to the resultant force on the object and inverserley proportional to the mass of the object

Question 2

What is resultant force

Answer 2

Mass x Acceleration

Question 3

What is the inertia of an object

Answer 3

The tendency to stay at rest or in uniform motion

Question 4

What is the difference between mass and weight

Answer 4

Weight of an object is the force acting on the object due to gravity, the mass is the quantity of matter in the object

Question 5

What is the motion of a falling object acted on only by gravity

Answer 5

It would accelerate at about 10 m/s squared

Question 6

What does terminal velocity mean

Answer 6

The velocity it will eventually reach when it’s falling

Question 7

What can be said about the resultant force acting on an object that is falling at terminal velocity

Answer 7

When an object is moving at terminal velocity the resultant force is zero

Question 8

What are the forces that oppose the driving force a vehicle

Answer 8

Friction an air resistance

Question 9

What does the stopping distance of a vehicle depend on

Answer 9

Thinking and braking distance

Question 10

What can increase the stopping distance of a vehicle

Answer 10

High speed, poor weather conditions, and poor vehicle maintenance, high speed, poor reaction time ( due to tiredness alcohol drugs or on your mobile phone )

Question 11

How do you estimate the braking force of the vehicle

Answer 11

Mass times acceleration

Question 12

How do you calculate momentum

Answer 12

Mass x velocity = P Kg m/s

Question 13

Why did two objects that push each other apart move away at different speeds

Answer 13

If they have unequal masses, and with equal and opposite momentum

Question 14

What is the conservation of momentum equation

Answer 14

Mass of a X velocity of a + mass of B X velocity of B

Question 15

What affects the force of impact when two vehicles collid

Answer 15

Mass, change the velocity, and the length of the impact time

Question 16

.

Answer 16

Impact force depends on the impact time

Question 17

What can be said about the impact forces and the total momentum when two vehicles collide

Answer 17

They exert equal and opposite forces on each other, the total momentum is unchanged

Question 18

Why does impact force depend on the impact time

Answer 18

Impact force = change in momentum / impact time, so shorter impact time means greater impact force

Question 19

Why do you cycle helmets and cushion services reduce impact forces

Answer 19

Because they increase the impact time

Question 20

Why do you seat belts and airbags reduce the force on people in car accidents

Answer 20

They spread the force across the chest and increase the impact time

Question 21

How does impact bars and crumple zones work

Answer 21

They increase impact time

Question 22

How to work out if a car in a collision was speeding

Answer 22

Using conservation of momentum to find the speed before the accident

Question 23

What is meant when an object is called elastic

Answer 23

If the objects can return to its original shape after removing the force deforming it in the first place

Question 24

How do you measure the extension of an object when it’s stretched

Answer 24

Original Length - new length = extension

Question 25

How does the extension of the spring change with the force applied to it

Answer 25

The extension of a spring is directley proportional to the force applied to it

Question 26

What is meant by the limit of proportionality of a spring

Answer 26

The extension of the spring is no longer proportional to the applied force