Forces

Question 0

What can the force change on an object?

Answer 0

Motion or state of rest

Question 1

What are forces measured in

Answer 1

Newtons

Question 2

When two objects interact they always do what

Answer 2

Always exert equal and opposite forces on each other

Question 3

What are the two things forces have

Answer 3

Size and direction

Question 4

Resultant force

Answer 4

Single force that is equal to all other forces acting on an object

Question 5

When the resultant force on an object is zero:

Answer 5

The object us at rest

The object is moving at the same speed and direction

Question 6

What is the resultant force of a 4N force and a 3N force acting in the same direction

Answer 6

7

Question 7

Resultant force of an object equation

Answer 7

Resultant force = mass multiplied by acceleration

Question 8

What is the resultant force on a car travelling at a steady speed on a straight horizontal road?

Answer 8

Zero

Question 9

Stopping distance

Answer 9

Distance travelled during the drivers reaction time and under the breaking force

Question 10

Thinking distance is increased if what

Answer 10

Driver alcohol or tired

Question 11

Breaking distance can be increased by

Answer 11

Bad roads
Bad weather
Condition of car

Question 12

Reaction time depends on

Answer 12

Driver

Question 13

Braking distance depends on

Answer 13

Road

Weather conditions and vehicle condition

Question 14

Weight of an object

Answer 14

Force of gravity on it

Question 15

Calculation for gravity weight

Answer 15

Weight = mass multiplied by acceleration due to gravity

Question 16

Gravitational field strength

Answer 16

If object is on earth and not falling

Question 17

Drag force

Answer 17

Resists object

Question 18

Terminal velocity

Answer 18

Constant velocity

Question 19

What can drag force also be called

Answer 19

Fluid resistance air resistance

Question 20

Hooke’s law

Answer 20

Extension is directly proportional to the force applied if the limit of proportionality is not exceeded

Question 21

Equation for Hooke’s law

Answer 21

Force applied= spring constant multiplied by extension

Question 22

A spring has a spring constant of 30N/m. If the extension is 0.30 what is the force applied

Answer 22

30 multiplied by 0.30 = 9N

Question 23

How can we tell a spring has exceeded it’s limit of proportionality

Answer 23

The straight line on a graph of extension curves

Question 24

Fuel economy

Answer 24

Reducing the speed of a vehicle reduces amount of fuel used to travel a particular distance

Question 25

Why does making a vehicle more streamlined improve the fuel economy

Answer 25

As it reduces the air resistance