P10

Question 1

Factors that affect acceleration

Answer 1

Two factors affect the acceleration of an object: the net force acting on the object and the object’s mass.

Question 2

factor that affects the acceleration of a mass.

Answer 2

The mass of the object and the force exerted on it determine how great an object’s acceleration is.

Question 3

effect of changing the mass or the force acting on an object on the acceleration of that object.

Answer 3

As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.

Question 4

define the inertial mass of an object in terms of force and acceleration.

Answer 4

Inertial mass is a measure of how difficult it is to change the velocity of an object. It is defined as ‘the ratio of force over acceleration’. Objects with a greater mass have greater inertia and so a greater resultant force will be required to cause the same acceleration.

Question 5

state the difference between the mass of an object and its weight.

Answer 5

Mass is the quantity of matter contained in a body.

Weight is the force of gravity acting on the body

Question 6

can describe the forces acting on an object falling through a fluid

Answer 6

There are three forces acting on an object falling through a viscous fluid: its weight w, the viscous drag FV, and the buoyant force FB.

Question 7

investigate the motion of an object when it falls.

Answer 7

Falling objects have two main forces weight and air resistance slowing the fall.

The size of these forces change as an object falls, until the object reaches a constant speed, called terminal velocity.

Question 8

How to calculate stopping distance

Answer 8

Stopping distance= thinking distance + braking distance

D=TxS (thinking distance)
D= distance. T=time. S=speed

E=Fd=1/2mr2
E=Energy F=force

Question 9

state factors which affect the stopping distance of a car.

Answer 9

Speed.
braking distance. …
Brakes. …
Tyre Pressure. …
Tyre Wear. …
Tyre Quality. …
Road Conditions. …
View of the Road. …
Distractions.

Question 10

Factors that affect thinking distance:

Answer 10

The thinking distance depends on the reaction time of the driver which could be affected by drugs, alcohol, distractions and tiredness.

Question 11

Factirs that affetc braking distance

Answer 11

Vehicle condition - e.g. worn tyres or poor brakes.
Road condition - wet or icy roads make it harder to decelerate.
Vehicle mass - a heavy vehicle, such as a lorry, takes longer to stop.

Question 12

Factors that affetct both:

Answer 12

Your speed

the faster you are going, the greater the distance travelled before you apply the brakes (thinking distance) and the vehicle comes to a complete stop (braking distance).

Question 13

What is the formula for initial speed

Answer 13

The equation is s = ut + 1/2at^2, where s - distance, u - inititial velocity, and a - acceleration.

Question 14

How do you calculate reaction time

Answer 14

Using the change in velocity and acceleration, we can find the time using the following equation: a = ∆v / t. We can rearrange the formula to make ‘t’ the formula of the subject, which is the reaction time of the person.

Question 15

describe how the principle of conservation of momentum can be used to find the velocities of objects.

Answer 15

Momentum conserved is and can be used to calculate an unknown velocity following a collision or speration if all the other masses or velocities are known

Sum of momentum after collision = sum of momentum after the collision

Question 16

investigate the behaviour of objects during explosions to verify the conservation of momentum.

Answer 16

If the vector sum of all individual parts of the system could be added together to determine the total momentum after the explosion, then it should be the same as the total momentum before the explosion.

Question 17

state Hooke’s law

Answer 17

Hooke’s law: The extension of a spring is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.

Question 18

compare materials in terms of elastic and non-elastic behaviour.

Answer 18

The main difference between the elastic and the plastic material is the behavior of their structures. Elastic materials will break when they reach their elastic limit whereas the plastic material will not break

Question 19

Limitations of proportionality on Hookes law

Answer 19

The limit of proportionality refers to the point beyond which Hooke’s law is no longer true when stretching a material. The elastic limit of a material is the furthest point it can be stretched or deformed while being able to return to its previous shape.

Question 20

Find the spring constant of a spring using a graphical technique

Answer 20

As stated above the relationship depicted on the graph is W = kx where k is the spring constant. Therefore, the spring constant is the slope of the line. Slope of a line is commonly defined as the rise over the run.