Unit Two - Unit Physics Review

Question 1

What are scalars?

Answer 1

Quantities that are fully described by a magnitude (or numerical value) alone

Examples include 15 seconds (time), 7m (length), and 65 Kg (mass)

Question 2

What are vectors?

Answer 2

Quantities that are fully described by both a magnitude and a direction

Examples include 100K [N] (displacement) and 66 Km/h (Fwds - velocity)

Question 3

Fill in the blank: Scalars are quantities that are fully described by a _______ alone.

Answer 3

magnitude

Question 4

Fill in the blank: Vectors are quantities that are fully described by both a magnitude and a _______.

Answer 4

direction

Question 5

True or False: A scalar can have both magnitude and direction.

Answer 5

False

Question 6

What is distance?

Answer 6

Distance is a scalar quantity that refers to ‘how much ground an object has covered’ during its motion.

Question 7

What is displacement?

Answer 7

Displacement is a vector quantity that refers to ‘how far out of place an object is’; it is the object’s overall change in position.

Question 8

What is physics?

Answer 8

Physics is the study of motion.

Question 9

What is motion?

Answer 9

Motion is a change in the position of an object over time.

Question 10

What influences motion?

Answer 10

Motion influences when an object moves and the forces necessary to make them move.

Question 11

How do scientists describe an object’s motion?

Answer 11

Scientists describe an object’s motion as a change in position relative to an object or place that is not moving.

Question 12

What is a reference point?

Answer 12

A reference point is an object or place that is not in motion.

Question 13

What is a frame of reference?

Answer 13

A frame of reference is another term for a reference point.

Question 14

What does motion depend on?

Answer 14

Motion completely depends on the point of view of the observer.

Question 15

What is distance?

Answer 15

Distance is a scalar quantity that refers to ‘how much ground an object has covered’ during its motion.

Question 16

What is displacement?

Answer 16

Displacement is a vector quantity that refers to ‘how far out of place an object is’; it is the object’s overall change in position.

Question 17

Who are the key figures in the development of laws concerning motion and forces?

Answer 17

Newton and Albert Einstein.

Question 18

What is a force?

Answer 18

A force is a movement of energy in a direction which is a transfer of energy causing motion.

Question 19

What is the unit used to measure force?

Answer 19

The unit we use to measure force is Newton (N) (Kg-m/s²).

Question 20

What is an example of a force?

Answer 20

Friction is a force acting opposite of motion.

Question 21

What does the first law of motion state?

Answer 21

An object in motion stays in motion, and an object at rest stays at rest unless acted on by an external force.

Example: In hockey, the puck will continue in a straight line at the same speed unless an external force (the goal post, snow on the ice, a player, etc.) applies a force to the puck.

Question 22

What happens when a force is applied to an object?

Answer 22

The direction and speed of the object will change.

Note: On Earth, friction and gravity act continuously on objects.

Question 23

What is the law of acceleration?

Answer 23

An object accelerates when an external force acts on a mass; greater mass requires greater force to accelerate.

Example: Little Johnny kicks a brick wall with a force of 5N and it doesn’t move, but when he kicks the soccer ball with the same amount of force, it moves all the way across the field.

Question 24

How does mass affect acceleration?

Answer 24

Heavier objects need more force to move than lighter objects. A lighter object will accelerate more than a heavier one if the same force is applied.

Question 25

What does the Law of Action & Reaction state?

Answer 25

Every action has an equal and opposite reaction.

Question 26

What happens when an object pushes another object?

Answer 26

It gets pushed back in the opposite direction equally as hard.

Question 27

What does Little Johnny need to do to skateboard forward?

Answer 27

He needs to push back.

Question 28

What often acts in the opposite direction when pushing an object forward?

Answer 28

Friction.

Question 29

What must be overcome for an object to move?

Answer 29

The amount of friction and the mass of the object.

Question 30

What is air resistance?

Answer 30

The friction created by air.

Question 31

What are two examples of motion that are too SLOW for the human eye to view?

Answer 31

1. Plants growing
2. The Northern Lights

Question 32

What technologies have been developed to help us view slow motion?

Answer 32

Cameras/stop motion timelapse

Question 33

What are two examples of motion that are too FAST for the human eye to view?

Answer 33

1. The propellers of a plane
2. The smartboard

Question 34

What technologies have been developed to help us view fast motion?

Answer 34

Slow motion cameras
Radar Guns

Question 35

What are two examples of motion that are not visible for the human eye to view?

Answer 35

1. The lights blinking
2. Tectonic plate movement

Question 36

What technologies have been developed to help us view motion that is not visible?

Answer 36

Microscope