Physics

Question 1

What is Hook’s law?

Answer 1

The extension of an elastic object is directly proportional to the force applies ( extension ×2 force ×2 or 0 extension =0 force.

Question 2

How can you investigate Hooke’s law?

Answer 2

1Hang the spring from a stand then measure its length with a ruler.
2.Hang a mass from he spring and measure the new length of the spring.
3.Work out the extension= new length - original length.
4. Keep adding more masses , measuring the new length each time then work out the extension for each mass. (Extension on the x axis)

Question 3

What is a moment?

Answer 3

Is a turning effect on a force. Forces can make objects turn if there is a pivot.

Question 4

How to calculate the moment :

Answer 4

Moment = force × distance
Nm=n×m

Question 5

What is deformation?

Answer 5

Is a change in shape when a force is exerted on them and then they return to their original size when the force is removed.

Question 6

What are elastics?

Answer 6

They change shape when a force is exerted on them and return to their original size when force is removed

Question 7

Example of simple machines:

Answer 7

See-saw = when a force is exerted in one place, causing movement and a force at another place in the see saw.
Wheelbaroows- is the wheel is the pivot and the load is put near there, and the effort is on the handles far from the pivot

Question 8

What is a pivot?

Answer 8

A fixed centre of rotation (for example a wheel on a wheelbarrow or the round part of the forceps)

Question 9

What is a lever?

Answer 9

They allow forces applied to be multiplied through rotation around a pivot. It is a simple machine ( seesaw)

Question 10

Which store increases when an elastic object is stretched or squashed?

Answer 10

The elastic potential

Question 11

How is Work done calculated?

Answer 11

Work done = force × distance
J (joules) = newton’s × metres

Question 12

What is the equation Linking force extension and spring constant?

Answer 12

Force = spring constant × extension
N= n/m × m

Question 13

What is the force?

Answer 13

An interaction between 2 objects that pulls or pushes the objects together

Question 14

What is the resultant force?

Answer 14

The single overall force.

Question 15

What is extension?

Answer 15

The measure of how much an elastic object has been stretched.

Question 16

Wha ti’s compression?

Answer 16

The measure of how much an elastic object has been squashed

Question 17

What is the difference between between an elastic and inelastic object?

Answer 17

An elastic object is an object that can be squashed or compressed and can return to its original shape and size however an inelastic object is an object that can not return to its original shape and size after it has been squashed or compressed.

Question 18

What is direct proportion?

Answer 18

When the IV and DV are related because if the IV doubles the DV doubles too.

Question 19

What is elastic potential energy?

Answer 19

The store of energy in extended and compressed objects.

Question 20

What is work done?

Answer 20

The energy transferred when a force moves an object

Question 21

Explain newtons second law:

Answer 21

A resultant force acting on an object causes acceleration, depending on the size of the resultant force and the mass of the object (resultant force = mass × acceleration)

Question 22

What is the effort?

Answer 22

Where the force applied to the lever (the handles most of the tine)

Question 23

When the force is removed from a stretched object, to which energy store is the elastic potential energy transferred?

Answer 23

Kinetic energy store

Question 24

When does an object balance?

Answer 24

When the moments are equal.

Question 25

Why do different springs stretch different for the same force

Answer 25

The length of the spring.

Question 26

What is specific heat capacity?

Answer 26

Energy required to raise the temperature of 1kg of a substance to 1 degree celcius