Forces

Question 0

What are forces measured in?

Answer 0

Newtons (N)

Question 1

What is a force?

Answer 1

Anything that causes an object to change it’s soeed or direction

Question 2

Name 6 examples of force

Answer 2

push, pull, friction, magnetic, gravity, weight

Question 3

How are forces measured?

Answer 3

using a spring balance

Question 4

Draw a diagram of a spring balance.

Answer 4

.

Question 5

when does friction occur?

Answer 5

when two surfaces rub together

Question 6

Name a function of friction

Answer 6

to slow down moving objects, cause wear and tear of materials and cause things to use more energy to move.

Question 7

What affects how much friction there is?

Answer 7

how rough the surfaces are

Question 8

how can friction be reduced?

Answer 8

by adding a lubricant e.g. oil, grease

Question 9

Name 2 advantages of friction

Answer 9

> Friction between our shoes and the ground stops our feet slipping backwards and allows us to walk.
Friction between car tyres and the road stops the car skidding and allows cars and bikes to move.

Question 10

Name two disadvantages of friction

Answer 10

> Slows down objects so more energy is used for movement.

> Causes wear and tear of materials.

Question 11

Write down the friction experiment

Answer 11

.

Question 12

What is weight?

Answer 12

The weight of an object on the earth is the force of attraction between the earth and the object.

Question 13

What is weight measured in?

Answer 13

Weight is a force and so is measure in Newton

Question 14

Weight is a ________

Answer 14

force

Question 15

How do you find the weight of an object?

Answer 15

the force formula

Weight = Mass (in kilograms) x Acceleration due to gravity (10)

Question 16

Write out the formula for weight

Answer 16

Weight = Mass (in kilograms) x Acceleration due to gravity (10)

Question 17

what changes what the acceleration different objects het from the earth?

Answer 17

Nothing

The acceleration that an object gets from the earth is the same for all objects and is approximately 10m/s2.

Question 18

what is the acceleration different objects get from the earth?

Answer 18

10m/s2

Question 19

give an example of changing mass into weight

Answer 19

Eg A bag of flour has a mass of 500g.
The weight of the flour = mass in kilograms x 10 (acceleration on the earth due to gravity)
= 0.5x10=5N

Question 20

If a bag of flour has a mass of 500g convert it to force

Answer 20

The weight of the flour = mass in kilograms x 10 (acceleration on the earth due to gravity)
= 0.5x10=5N

Question 21

Name three differences between mass and weight

Answer 21

MASS l. Measured in kilograms (kg) 
2. Is fixed, never changes. 
3. Is a fixed feature of all things- like length or volume. 
WEIGHT 1. Measured in newtons (N) 
2. Varies, depends on where you are. 
3. Is a force or pull on something.

Question 22

what is hooke’s law

Answer 22

HOOKES LAW:
Hooke’s Law states that the extension of a spring is proportional to the weight attached to it.

Question 23

what does it mean if something is directly proportional to something else

Answer 23

If two quantities are in direct proportion, as one increases/decreases, the other increases/decreases by the same percentage.

Question 24

if two things are directly proportional what would a graph look like

Answer 24

a straight line graph through 0,0

Question 25

write hookes law experiment

Answer 25

.