Noir Force

Question 1

What is mass?

Answer 1

Mass is the amount of matter that makes up an object.

Question 2

What unit is used to measure mass?

Answer 2

Kilograms (kg)

Question 3

Does mass change depending on location?

Answer 3

No, mass stays the same no matter where you are.

Question 4

What is weight?

Answer 4

Weight is the amount of gravitational force acting on an object.

Question 5

What unit is used to measure weight?

Answer 5

Newtons (N)

Question 6

What does weight depend on?

Answer 6

Weight depends on both the mass and the gravitational field strength.

Question 7

Which tool is used to measure mass?

Answer 7

A measuring scale.

Question 8

Which tool is used to measure weight?

Answer 8

A forcemeter.

Question 9

How does a forcemeter work?

Answer 9

It contains a spring connected to a hook that stretches with more force.

Question 10

How is weight calculated?

Answer 10

Weight = Mass x Gravitational field strength.

Question 11

What is the weight of a 70kg object on Earth?

Answer 11

687 N (70 kg × 9.81 N/kg)

Question 12

What is the weight of a 70kg object on the Moon?

Answer 12

114 N (70 kg × 1.63 N/kg)

Question 13

What is gravity?

Answer 13

Gravity is the force that attracts all objects to the centre of the Earth.

Question 14

What does the force of gravity depend on?

Answer 14

It depends on the mass of the object.

Question 15

Does gravity vary in different locations?

Answer 15

Yes, gravity differs on Earth, the Moon, and other planets.

Question 16

What is weightlessness?

Answer 16

It is the condition when gravity is zero or appears so.

Question 17

Where can weightlessness be experienced?

Answer 17

On the International Space Station (ISS).

Question 18

Why do astronauts float in space?

Answer 18

Because they are not pulled in any one direction.

Question 19

What health problems are caused by weightlessness?

Answer 19

Weakened bones and muscles.

Question 20

What happens when astronauts return to Earth?

Answer 20

They need help to rebuild and re-strengthen their muscles.

Question 21

What is a force?

Answer 21

A push or pull action acting upon an object.

Question 22

List the effects a force can have on an object.

Answer 22

Change direction, shape, start motion, speed up/slow down, stop motion.

Question 23

Give an example of a force changing direction.

Answer 23

A cricket ball changes direction when hit by a bat.

Question 24

Give an example of a force changing shape.

Answer 24

A rubber band stretches and changes shape.

Question 25

Give an example of a force making an object move.

Answer 25

A soccer ball is kicked from rest.

Question 26

How can force affect speed?

Answer 26

More force speeds up; braking reduces speed.

Question 27

How can force stop an object?

Answer 27

Opposing forces like friction or resistance slow and stop motion.

Question 28

What is gravitational force?

Answer 28

It pulls the object down.

Question 29

What is normal force?

Answer 29

It supports the object's weight on a surface.

Question 30

What two forces act on floating objects?

Answer 30

Weight and upthrust.

Question 31

What is upthrust?

Answer 31

The upward force exerted by a liquid on an object.

Question 32

What happens when upthrust = weight?

Answer 32

The object floats.

Question 33

What happens when weight > upthrust?

Answer 33

The object sinks.

Question 34

Why does a cork float and a coin sink?

Answer 34

Because the cork displaces more water relative to its weight.

Question 35

Why do ships float?

Answer 35

They displace more water than their weight despite being heavy.

Question 36

What is an electric circuit?

Answer 36

A closed loop that allows electric current to flow.

Question 37

What components are in a basic circuit?

Answer 37

Energy source, device, switch, and wires.

Question 38

What is the function of a battery in a circuit?

Answer 38

To provide energy.

Question 39

What does a switch do in a circuit?

Answer 39

Opens or closes the loop.

Question 40

What do wires do in a circuit?

Answer 40

Carry the electric current.

Question 41

What is a circuit diagram?

Answer 41

A symbolic drawing showing electrical components.

Question 42

Why use symbols in a circuit diagram?

Answer 42

They are quicker and more universal.

Question 43

What symbol represents a battery in a circuit diagram?

Answer 43

A pair of short and long lines.

Question 44

What symbol represents a light bulb?

Answer 44

A circle with a cross inside.

Question 45

What symbol represents a switch?

Answer 45

A break in a line with a diagonal line across.

Question 46

Why is weight different on the Moon than on Earth?

Answer 46

Because the Moon has a smaller gravitational pull.

Question 47

What happens to an object's weight as gravity increases?

Answer 47

Its weight increases.

Question 48

What causes resistance in motion?

Answer 48

Friction and air resistance.

Question 49

How do brakes slow down a bicycle?

Answer 49

By applying a force opposite to its motion.