P10

Question 1

What is the equation of resultant force?

Answer 1

Mass X Acceleration

Question 2

What is newtons second law

Answer 2

The acceleration of an object is proportional of the resultant on the object, inversly proportionaly to the mass of the object

Question 3

What is it called when the velocity of an object increases

Answer 3

Acceleration is positive

Question 4

What is it called when the velocity of an object is decresed

Answer 4

Negative acceleration

Question 5

Equation of acceleration

Answer 5

Acceleration = force/mass

Eg: object accelerates downwards at a constant acceleration of 10m/s and the weight is 1kg

= force/mass = 10/1 = 10m/s

Question 6

What is weight measure in

Answer 6

Newtons

Question 7

What is mass always measured

Answer 7

Kg

Question 8

Equation of weight

Answer 8

Weight = mass X Gravitational field strength

Question 9

What happens to an object when dropped in fluid

Answer 9

Friction increases towards the object which makes it slow down as it goes down because of its weight

Question 10

What is terminal velocity

Answer 10

When an object reaches a constant velocity when the frctional force on it is equal and oppisited to its weight . The resultant force is then zero, so its acceleration is also zero

Question 11

What is the breaking force depend on

Answer 11

Speed of the vehicle when the brakes are first applied and the mass of the vehicle

Question 12

How are stopping disrances calculated

Answer 12

Thinking distance and braking distance = thinking + breaking

Question 13

What is thinking distance

Answer 13

How long the driver reacts or the drivers reaction time

Question 14

What is breaking distance

Answer 14

The distance travelled by the vehicle during the time the braking force acts

Question 15

What are the main factors effecting stopping distances

Answer 15

1) tiredness, alcohol or drugs that effect the brain or even some distractions such as phones and more
2) how fast the vehicle is travelling, the further it travels before it stops. This is because the thinking distance and the braking distnace both increase with increased speed
3) road conditions such as wet or icy roads (make them skid)
4) poorly made brakes of vehicles

Question 16

Equation of momentum

Answer 16

Momentum,p (kg m/s) = mass,m (kg) X velocity,v (m/s)

Question 17

What is the law lf conservation of momentum

Answer 17

In a closed system, the total movement before an event is equal to the total momentum after the event

(Look 10.4 kerboodle for more info)

Question 18

What happens to a bowling ball once its crashed into the pins

Answer 18

The ball loses an equal amount of momentum and the ball and the pins exert equal and oppisit forces on eachother when they are in contact but no external forces act on them

(Look at 10.4 and .5 for more)

Question 19

What is impact time?

Answer 19

Where the impact time is long so that the impact force is reduced with removes more a risk of an injury around your body

Question 20

What makes impact times longer?

Answer 20

Crumple zones, seatbelts and airbag

Question 21

What is he equation to show how much impact force can be reduced

Answer 21

Force = mass (kg) X change of velocity (m/s) / time taken (s)

Look more on 10.6

Question 22

Why are air bags useful

Answer 22

When its used its popped out of the wheel and spreads the force on the upper part of a persons body preventing they hitting anything hard in front of them

Question 23

Where is safety found in playgrounds?

Answer 23

Most playgrounds are fitted with cushioned surfaces below swings and slide just in case children fall off to reduce the risk of head injury.

Question 24

Why should cyclist always use helmets when riding

Answer 24

Since there are some foam and cushion on it when a person falls over it increases impact time which means it reduce the impact of it afterwards

Question 25

What is elasticity?

Answer 25

Where an object changes its shape and it returns to its own original shape such as rubber bands and squash balls

Question 26

How do you find out the extension of the strip?

Answer 26

Extension of the strip of material or spring at any stage = length at stage - original length

Question 27

What is hookes law

Answer 27

a law stating that the strain in a solid is proportional to the applied stress within the elastic limit of that solid.