PHYSICS - Forces and Motion

Question 1

What’s weight?

Answer 1

Force due to gravity

Question 2

What’s friction?

Answer 2

Force that resists motion

Question 3

What’s resistance?

liek as in air resistance y’know

Answer 3

Drag force as an object tries to move through liquid or gas

Question 4

What’s the name of the unit of force? (gravity guy)

Answer 4

Newton (N)

Question 5

What’s mass?

like what is it really?

Answer 5

Amount of matter stuff is made from

Question 6

What’s the unit of mass?

Answer 6

Kg

Question 7

Does mass change depending on location?

like on the moon vs earth for example

Answer 7

No, but weight can if the gravity changes

Question 8

What’s the unit of weight?

Answer 8

N

Question 9

What’s the equation for weight?

Answer 9

Mass x Gravitational field strength

(field strength’s 10 on earth)

Question 10

What’s gravity?

Answer 10

force of attraction between masses

Question 11

What gives weight?

Answer 11

Gravitational attraction

Question 12

What’s newton’s first law?

Answer 12

“If a body is in a state of rest (stationary) or moving at a constant speed it will continue to do so unless acted on by an external force”

this is also called the law of inertia - 🤓

Question 13

What’s newton’s second law?

Answer 13

F=ma

If forces on an object are inbalanced, an object will accelerate or decelerate. If force is large, it will accelerate more, but if mass is large, it will accelerate less.

Question 14

When there are two forces acting on an object in different directions, how do you get the resulting force?

mathemtica;l

Answer 14

It’s the difference between the two forces (minus)

Question 15

Suppose a guy is on a bridge. The guy’s weight is 100 000N. What force must the bridge supply to support him?

Answer 15

100 000N

Question 16

What is newton’s third law?

everyone’s favourite

Answer 16

For every action there’s an equal and opposite reaction

Question 17

suppose a monkey is holding a cardboard box. The monkey weighs 200N, and the box 50N.

What force does the ground react with to support the monkey?

Add Footnote

Answer 17

200 + 50 = 250N

Question 18

Describe the life journey of a skydiver jumping out of a plane from when he jumps to the parachute opening

Answer 18

1) The only force is weight, so skydiver accelerates downwards
2) As he accelerates, he experiences air resistance and accelerates at a slower rate
3) Eventually air resistance and weight are equal, so he stops accelerating and falls at a constant speed (this is terminal velocity)
4) When the parachute opens, air resistance increases rapidly and the skydiver decelerates downwards
5) As the skydiver decelerates, air resistance also decreases. It becomes equal to the weight again and skydiver now has a new, slower terminal velocity

Question 19

What’s the name of a force pulling a skydiver to the ground?

it ain’t gravity, bozo

Answer 19

Weight

Question 20

Without air resistance, how do objects accelerate when dropped?

Answer 20

All objects accelerate the same due to gravity

only without air resistance though