Checklists 3.1, 4.1 (Year 10)

Question 1

What is the equation to calculate momentum?

Answer 1

Mass x Velocity

Question 2

What is the unit for momentum?

Answer 2

Kg m/s

kilograms meter per second

Question 3

What is the unit for velocity?

Answer 3

m/s (Meters per second)

Question 4

What is the unit for mass?

Answer 4

Kg (Kilograms)

Question 5

Can you draw the equation triangle for momentum?

Answer 5

p = m x v
(Momentum = Mass x Velocity)

Question 6

What is conservation of momentum?

Answer 6

Momentum in = Momentum out

Question 7

How can we survive impacts better?

Answer 7

With seat-belts and airbags

Question 8

What do car manufacturers add to cars to help protect their passengers?

Answer 8

Seat-belts and airbags

Question 9

What affects the force when two vehicles collide?

Answer 9

Newtons third law (When two objects push or pull from each other, they exert equal and opposite forces)

Question 10

How can we reduce an impact force?

Answer 10

A simple answer is: To make the force as small as possible we use seat belt and airbags

Explanation:
(A seat belt, which stretches when the car stops moving, so that the person wearing the belt doesn’t stop immediately.
Air bags have the same effect - they slow down the change in momentum, and so reduce the forces.)

Question 11

What is the equation for acceleration?

Answer 11

Meters Per Second divided by Seconds

Change of velocity divided by the time taken

Question 12

What is the equation for force?

Answer 12

m x a (Mass x Acceleration)

Question 13

How can we combine the acceleration and the force equations to give us a change in momentum equation?

Answer 13

If you combine those two equations, it would be:
kg m/s = Newtons x Seconds
(Change in momentum = force x time)

Question 14

If we can increase mass what must our velocity do?

Answer 14

Decrease

Question 15

If we increase velocity what must our mass do?

Answer 15

Decrease

Question 16

What is meant by power in Science?

Answer 16

Watt (W)

Question 17

How is power measured?

Answer 17

Joules divided by Seconds

Energy Transformed divided by time

Question 18

What is the relationship between power and energy transferred?

Answer 18

If you multiplied them it would give you the time:
Watts x Joules = Seconds
(Power x Energy transferred = Time)

Note: A Watt is just a flow of one Joule per second.

Question 19

What are the units for power, work, Energy and Time?

Answer 19

Power: Watts
Work: Joules
Energy: Joules
Time: Seconds

Question 20

What is a kilowatt?

Answer 20

Kilowatts is basically 1000 watts

Question 21

What happens to the Gravitational Potential Energy (GPE) when an object moves up or down?

Answer 21

The higher the object is, the more Gravitational Potential Energy (GPE) and the lower it is, the less.

Question 22

Why does an object moving up gain GPE?

Answer 22

Because we are going further away from the surface of the Earth.

Question 23

How can we calculate the change in GPE when an object moves up or down?

Answer 23

Joules = m x g x h

Gravitational Potential Energy = Mass x Gravitational Field Strength x Height)

Question 24

What does the kinetic energy of an object depend on?

Answer 24

Its mass and its speed

Question 25

What is meant by conservation of energy?

Answer 25

Energy can not be created nor destroyed

Question 26

Why is conservation of energy important?

Answer 26

Because it’s impossible to create energy or destroy it.

Question 27

How can we calculate Kinetic Energy?

Answer 27

1/2 x kilograms x seconds squared

1/2 × mass × speed to the power of 2