Crash Course (Physics)

Question 1

Define distance and speed with units

Answer 1

-Speed is the distance an object travels divided by the time it takes.

Question 2

Describe the relationship between distance, speed and time

Answer 2

(Speed) V=d (distance) divided by t (time)

-Distance= Speed x time or D=v x t

Question 3

Relate acceleration to a change in SPEED as a result of a net force

Answer 3

Force is equal to the change in momentum per change in time. For a constant mass, force equals mass times acceleration.”

If you double the force, you double the acceleration, but if you double the mass, you cut the acceleration in half.

Question 4

Relate acceleration to a change in DIRECTION as a result of a net force

Answer 4

If two forces of equal strength act on an object in opposite directions, the forces will cancel, resulting in a net force of zero and no movement.

Two or more opposite forces are balanced forces if their effects cancel each other and they do not cause a change in an object’s motion.

Question 5

Describe the relationship between force, mass and acceleration

Answer 5

Force is equal to the change in momentum per change in time. For a constant mass, force equals mass times acceleration.”

If you double the force, you double the acceleration, but if you double the mass, you cut the acceleration in half.

Question 6

State Newton’s 3 laws

Answer 6

• First law is Law of Inertia (An object will remain at rest, or will not change its speed or direction, unless it is acted on by an external force)
• Second law is Mass x acceleration= force
• Third law is Law of Motion (For every action there is an equal and opposite reaction.)

Question 7

Identify and explain everday situations involving motion in terms of Newton’s laws

Answer 7

First Law-
When kicking a soccer ball the ball will eventually stop due to friction or by someone stopping it with their body etc.
Second Law- Pushing an empty shopping cart is easier than a full one, because the full shopping cart has more mass than the empty one.
Third Law- When sitting on the chair gravity pulls you down but the chair pushes you back up

Question 8

Identify the different types of energy

Answer 8

Solar- Heat, light and sound
Gravitational/elastic- Potential
Moving- Kinetic
Food and Fuels- Chemical
Nuclear and electrical

Question 9

Describe the law of energy conservation

Answer 9

The law of energy conservation states that energy can neither be created nor destroyed - only converted from one form of energy to another.