Simple Mechanics (9)

Question 1

Standard unit for length:

Answer 1

Length = M (meter)

Question 2

Standard unit for energy:

Answer 2

Energy = J (Joule)

Question 3

Standard unit for force:

Answer 3

Force = N (Newton)

Question 4

Standard unit for time:

Answer 4

Time = S (seconds)

Question 5

Standard unit for speed:

Answer 5

Speed = M/S (meters per second)

Question 6

How do you find the distance travelled on a velocity time graph

Answer 6

Find the area underneath the graph

Question 6

If an object was accelerating then how would it be displayed on a velocity time graph

Answer 6

Diagonal line pointing up

Question 7

If an object was travelling at a constant speed then how would it be displayed on a velocity time graph

Answer 7

Horizontal line

Question 8

Area of a triangle

Answer 8

Area = 1/2 x base x height

Question 9

What is acceleration

Answer 9

A measure of how fast the speed of an object increases

Question 11

What is the equation for acceleration

Answer 11

Change of speed/Time taken

Question 12

How do you find out the change of speed

Answer 12

Final speed — starting speed

Question 13

Symbol equation for acceleration

Answer 13

v — u
A= ———
t

Question 13

Definition of speed

Answer 13

A measurement of how quickly something moves

Question 14

What is the unit for acceleration

Answer 14

[M/S2]

Meters per second squared

Question 15

When do we use use average speed

Answer 15

If a journey does not happen at a constant speed we often quote the average speed for the journey

Question 17

Equation for average speed

Answer 17

Total distance travelled/Total time taken

Question 18

Equation for velocity

Answer 18

Displacement (distance + direction)/time

Question 19

Equation for average velocity

Answer 19

Total displacement (distance + direction)/total time

Question 19

What is velocity

Answer 19

Velocity is a measure of speed in a particular direction

Question 20

Equation for average acceleration

Answer 20

Change in Velocity/change in time

Question 22

What is a scalar

Answer 22

A scalar is a measurement where direction doesn’t matter

Question 22

State 3 vectors

Answer 22

Velocity
Displacement
Force
Acceleration
Gravity

Question 23

What is a vector

Answer 23

A vector is a measurement which has a direction

Question 24

State 3 scalars

Answer 24

``` Speed Distance Time Energy Pressure Mass Area ```

Question 26

What is terminal Velocity

Answer 26

The maximum speed at which falling objects can reach where the can no longer accelerate

Question 27

Why does terminal Velocity occur

Answer 27

Because the air resistance increases until the air resistance and the weight balance until the resultant force is 0. The object then hits the ground and stops

Question 28

On the moon there is no ___ | However there is a bit of _______

Answer 28

On the moon there is no air | However there is gravity

Question 29

There is 6 times more gravity on the earth than the _______

Answer 29

Moon

Question 29

What is the opposite of the force 'thrust'

Answer 29

Drag

Question 30

There is no ____ _________ on the moon therefore a hammer and a feather would fall to the ground at the same time

Answer 30

Air resistance

Question 31

Forces cannot be seen but we can see or feel their _______

Answer 31

Effects

Question 32

Forces are drawn as ______

Answer 32

Arrows

Question 34

To show big forces we draw _____ ________

Answer 34

Big arrows

Question 34

Are forces scalars or vectors

Answer 34

Vectors

Question 35

To show little forces we draw ________ ________

Answer 35

Small arrows

Question 36

Name 3 types of force

Answer 36

``` Weight Friction Push Pull Magnetic Driving/thrust Nuclear Electrostatic ```

Question 37

State 2 effects of force

Answer 37

``` Produce movement Slow objects down Produce sound Produce heat Change shape of objects Change direction of objects ```

Question 38

What is the resultant force

Answer 38

This is a single force which is the sum of all the actual forces on an object

Question 39

If an object is in contact with a surface there will be a ______ _______ force

Answer 39

Normal contact force

Question 40

If all forces balance then the resultant force is __

Answer 40

0

Question 41

If the resultant force is 0 then the object is either ______ or ______

Answer 41

At rest OR Moving at a constant speed

Question 42

If a resultant force does exist then the object will either ________ or ________

Answer 42

Accelerate OR Decelerate This is Newton's first law

Question 43

What are projectiles

Answer 43

Objects with both vertical and horizontal velocity

Question 44

Friction is essential in some situations but in others it _________ energy and causes wear

Answer 44

Wastes

Question 45

If you push a ball off a flat surface then the horizontal velocity _______ change at any point (if we ignore resistance)

Answer 45

If you push a ball of a flat surface then the horizontal velocity DOES NOT change at any point (if we ignore resistance)

Question 46

For a particular object, the bigger the unbalanced force acting on it, the bigger the ____________

Answer 46

Acceleration

Question 48

If the same force is applied to objects of different mass then the more massive object the will have a __________ rate of acceleration

Answer 48

Smaller