P5: Forces and Motion [incomplete]

Question 1

Scalar [definition]:

Answer 1

A quantity that has magnitude but no direction

Question 2

Vector [definition]:

Answer 2

A variable quantity that has both magnitude and direction

Question 3

Force [definition]:

Answer 3

An influence tha occurs when two objects interact

Question 4

Resultant force [definition]:

Answer 4

The sum of or more forces acting on the same object

Question 5

Acceleration (definition)

[2]:

Answer 5

• The rate of change of velocity

- Measured in m/s^2

Question 6

Acceleration [equation]:

Answer 6

Acceleration = Change in velocity(m/s)
(m/s^2) —————————————
time(s)

Question 7

Circular motion (definition) 
[2]:

Answer 7

• Produced when an object rotates with a constant speed but changing velocity
• The instantaneous velocity is perpendicular to the centripetal force

Question 8

Velocity time graphs [2]:

Answer 8

• The gradient of the line shows acceleration

- The area under of the line of best fit gives you displacement/distance

Question 9

Uniform moton =

Answer 9

Constant acceleration

Question 10

Gravitational pull on Earth:

Answer 10

9. 8 for every 1kg of mass

9. 8N/Kg

Question 11

Mass (definition)

[2]:

Answer 11

• A measure of how much matter an object contains

- Measured in kilograms

Question 12

The mass of an object…

Answer 12

stays the same wherever it is

Question 13

Weight can change if…

Answer 13

the object goes somewhere gravity is stronger or weaker

Question 14

The moon is smaller than the Earth so…

Answer 14

it has less mass than the Earth

Question 15

Weight (definition) [2]:

Answer 15

• The vertical downwards force acting on an object due to gravity
• Measured in Newtons (N)

Question 16

Drag:

Answer 16

Air/ water resistant

Question 17

Newton’s first law [2]:

Answer 17

If the resultant force acting on an object is zero it will:

• If moving, keeps moving at a steady speed in a straight line
• If stationary would remain statonary

Question 18

Resultant force [equation]:

Answer 18

Mass(kg) x Acceleration(m/s^2)

Question 19

Newton’s second law [2]:

Answer 19

• The acceleration of an object increases if the resultant force on it increases
• Acceleration decreases if the mass of the object increases

Question 20

Inertia [definition]:

Answer 20

The tendency of an object/body to stay at rest or in uniform motion

Question 21

Upthrust is equal to…

Answer 21

the weight of the object that has been forced away

Question 22

A partially submerged object would experience…[2]:

Answer 22

• Greater pressure on the bottom surface than the top surface
• This creates a resultant force upwards (upthrust)

Question 23

Floating [2]:

Answer 23

• When the object’s weight is equal to the upthrust

- The forces then balance and the object will float on the liquid

Question 24

Sinking [2]:

Answer 24

• When an object’s weight is greater than the upthrust

- Then the object will sink

Question 25

Pressure difference [equation]:

Answer 25

density of fluid x gravitational field x change in depth

strength

Question 26

Momentum [equation]:

Answer 26

Momentum = Mass x Velocity

(kgm/s) (kg) (m/s)

Question 27

Conservation of momentum:

Answer 27

When two objects collide or interact, the forces acting on each other will stay the same

Question 28

Momentum [equation]:

Answer 28

Momentum = Mass x Velocity

(kgm/s) (kg) (m/s)

Question 29

Conservation of momentum:

Answer 29

When two objects collide or interact, the forces acting on each other will stay the same

Question 30

What happens to the momentum of an object when it is stationary?

Answer 30

Momentum is 0; there is no momentum

Question 31

Newton’s first law:

Answer 31

-

Question 32

Newton’s third law:

Answer 32

-