7k Forces

Question 1

What do forces do

Answer 1

Can change the shape,speed, or direction

Question 2

What is the difference between a contact force and a non contact force

Answer 2

A force which affects an object from a distance is a non contact force

Question 3

How do we measure forces

Answer 3

A newton metre

Question 4

What is mass

Answer 4

Mass is the amount of matter which makes something up

Question 5

Weight formula

Answer 5

Mass multiplied by 10 N

Question 6

What is friction and is it useful

Answer 6

It is the force between two touching objects (air resistance and water resistance are types of friction )
Sometimes it is useful for things like walking however can n9t be useful when there is too much friction between axels of a cycle it won’t move

Question 7

What can we do to reduce friction

Answer 7

Use a lubricant

Question 8

What does friction produce

Answer 8

Heat and noise

Question 9

Air and water resistance can be reduced by

Answer 9

Having smooth surfaces and shapes

Question 10

An object will float when

Answer 10

The upthrust cancels its weight

Question 11

Explain how something will float in terms of density

Answer 11

If the objects density is less than the liquid it will float

Question 12

Density formula

Answer 12

Mass in grams divided by volume in cm cubed

Question 13

Speed formula

Answer 13

Distance divided by time

Question 14

All stationary objects have

Answer 14

Balanced forces

Question 15

Moving objects at the same speed

Answer 15

Have balanced forces

Question 16

An object has unbalanced forces when

Answer 16

It changes speed

Question 17

What measures speed

Answer 17

A force meter

Question 18

What is the thinking distance

Answer 18

The distance the car travels in the time between when a driver sees something on the road realised they need to stop

Question 19

What is the breaking distance

Answer 19

The distance a car travels after the break pedal is pressed before it stops

Question 20

The stopping distance is

Answer 20

The break distance and thinking distance sum

Question 21

On distance time graph a steep slope is

Answer 21

Acceleration

Question 22

On distance time graph a shallow slope

Answer 22

Is a slow speed

Question 23

To find the relative motion of two objects opposite each other you

Answer 23

Add their speed

Question 24

To work out relative motion of two objects going the same direction you

Answer 24

Subtract the speed of the object behind of the one in front for example ma car is going at 30 mph and a tractor behind it is going at 20 mph so car minus tractor

Question 25

Non contact forces are

Answer 25

Gravitational pull between planets
Forces between magnets
Forces due to static electricity