Forces & Motion 1

Question 1

What do kilograms measure?

Answer 1

Mass

Question 2

What do meters/second measure?

Answer 2

Speed

Question 3

What do Meters/second2 measure?

Answer 3

Acceleration

Question 4

What do newtons measure?

Answer 4

Force

Question 5

What do newtons per kilogram measure?

Answer 5

Gravitational field strength

Question 6

What do newton meter measure?

Answer 6

Moments

Question 7

What is speed?

Answer 7

A measure of how fast someone or something is moving

Question 8

What is the formula involving speed, distance and time?

Answer 8

Speed = distance/time or v=s/t

Question 9

What is the formula for average speed?

Answer 9

Total distance/total time

Question 10

How doo you convert from m/s to kmph?

Answer 10

Multiply the number by 3600/1000

Question 11

How do you converet from kmph to m/s?

Answer 11

Multiply the number by 1000/3600

Question 12

What are the differences between a distance-time graph and a displacement-time graph?

Answer 12

Distance time graphs:
- Vector quantity
- Can’t move backwards

Displacement time graphs:
- Scaler quantity
- Can see direction

Question 13

What does the slope of the distance/displacement -time graph show?

Answer 13

The speed of the object

Question 14

True or false: The steeper the line of best fit the faster the object

Answer 14

True

Question 15

What does it mean for the line on a distance/displacement -time graph to be completely horisontal?

Answer 15

The object is stationary

Question 16

How do you calculate the gradient of a line?

Answer 16

Rise/run

Question 17

How is acceleration shown on a graph?

Answer 17

A curved, sloping upwards line

Question 18

What is the equation for stopping distance?

Answer 18

Thinking distance + braking distance

Question 19

What is meant by the stopping distance?

Answer 19

The distance travelled from when an obstruction is noticed to the vehicle coming to a halt

Question 20

What is meant by the thinking distance?

Answer 20

The distance travelled from when an obstruction is noticed until the brakes are applied

Question 21

What is meant by the braking distance?

Answer 21

The distance travelled from when the brakes are applied to the car stopping

Question 22

What factors can affect the thinking distance?

Answer 22

Alcohol
Drugs
Some medicines
Tiredness
Distractions
Speed travelling at
Age

Question 23

What factors can affect the braking distance?

Answer 23

Weather
Condition of road
Speed
Condition of tyres
Condition of brakes
Mass of car

Question 24

True or false: The braking distance increases based on the speed the vehicle is travelling at during the thinking distance.

Answer 24

True

Question 25

What are the formulae for the thinking distance?

Answer 25

speed*reaction time Stopping distance - braking distance

Question 26

What are the contact forces?

Answer 26

Friction Drag Water resistance Air resistance Upthrust Tension Lift Buoyancy Elastic Thrust Reaction force

Question 27

What are the non-contact forces?

Answer 27

Electro-static Magnetic Weight

Question 28

What are free-body force diagrams?

Answer 28

A simplified way of showing the forces acting upon an object

Question 29

What is the criteria for free body force diagrams?

Answer 29

Draw arrows with a pencil and a ruler All forces must be drawn from the centre of the object The object should be represented by a circle (doesn't need to be perfect) Write the force(s) being applied next to the arrow representing it

Question 30

What is the resultant force?

Answer 30

The sum of all forces acting on an object

Question 30

What us newton's first law of motion?

Answer 30

An object at rest or at a constant speed will remain unless an unbalanced force acts upon it

Question 31

What is the resultant force on balanced forces?

Answer 31

0

Question 32

What needs to be specified with the resultant force?

Answer 32

Direction and newtons

Question 33

What is friction?

Answer 33

The backwards force to a solid object moving on a solid surface

Question 34

What is friction measured in?

Answer 34

Newton metres

Question 35

How can we measure friction?

Answer 35

We measure friction by measuring the force we use to overcome friction

Question 36

What can affect friction?

Answer 36

Mass Surface Area in contact

Question 37

What are moments?

Answer 37

Turning forces

Question 38

True or false: the further you are from the pivot, the easier it is to lift the force.

Answer 38

True

Question 39

What is the formula for a moment?

Answer 39

Force*Perpendicular Distance

Question 40

What are moments measured in?

Answer 40

Newton metres

Question 41

What is the principle of moments?

Answer 41

If an object is in equilibrium: Sum of clockwise moments = sum of anticlockwise moments

Question 42

What is the centre of gravity on an object?

Answer 42

The point at which the weight force acts through

Question 43

How can you measure the centre of gravity on an object?

Answer 43

Suspend the object so it can hang freely Find the vertical using a plumbing line Draw a line across the object on the line of the string Hang the shape from a different point and repeat The place where the lines cross is the centre of gravity

Question 44

When a force acts on an object what can change:

Answer 44

Speed Shape Compression Length Tension

Question 45

What is Hooke's law?

Answer 45

That the extension of a spring is proportional to the amount of force applied

Question 46

What is the equation involving force, spring constant and extension?

Answer 46

Force = spring constant*extension

Question 47

What is the spring constant?

Answer 47

The measuremnt of how stiff the spring is

Question 48

What is elastic behaviour?

Answer 48

The ability of a material to return to its originall shape after a force has been removed

Question 49

What is the limit of proportionality?

Answer 49

When an elasticly-behaving object stops acting that way

Question 50

How is the limit of proportionality shown on a graph?

Answer 50

By the straight line plateauing