Forces Unit

Question 1

What is a force?

Answer 1

A push or a pull

Question 2

TOF: Forces always come in pairs

Answer 2

True

Question 3

What unit is used to measure force?

Answer 3

Newtons

Question 4

Balanced or unbalanced? A person standing still.

Answer 4

Balanced force

Question 5

Balanced or unbalanced? A boy doing push-ups.

Answer 5

unbalanced force

Question 6

Balanced or unbalanced? An object floating on water.

Answer 6

balanced force

Question 7

Balanced or unbalanced? A fruit falling from a tree.

Answer 7

Unbalanced force.

Question 8

Newtons 1st law.

Answer 8

Object at rest stays at rest…..Object in motion stays in motion.(unless outside forces)

Question 9

Newtons 2nd law.

Answer 9

Force is equal to the mass multiplied by the acceleration. (heavier things take more force to have the same acceleration )

Question 10

Newtons 3rd law.

Answer 10

All forces have an equal and opposite reactive force.

Question 11

What is another name for Newton’s first law?

Answer 11

Inertia

Question 12

What is another name for Newton’s 2nd law?

Answer 12

Acceleration

Question 13

What is another name for Newton’s 3rd law?

Answer 13

Action-Reaction

Question 14

What is inertia?

Answer 14

An objects desire to not move(if still) or to not stop moving(if moving)

Question 15

How would inertia affect a driver when a car comes to a complete start?

Answer 15

The driver keeps moving when the car stops.

Question 16

How would inertia affect a driver when a car immediately takes off from a resting position?

Answer 16

The driver remains still, so the seat has to push them forward.

Question 17

Is it possible to push a 50 kg sled 5m/s/s with 100 newtons of force?

Answer 17

Force= ma No because 50 x 5 = 250 so you would need 250 newtons not 200.

Question 18

Is it possible to move a 10 kg box 20 m/s/s with 500 newtons of force?

Answer 18

Force= ma Yes because 10x 20 = 200 so since 500 is over 200 newtons, that is more than enough.

Question 19

What is gravity?

Answer 19

The force of attraction between objects with mass

Question 20

What is the numerical value of gravity on Earth?

Answer 20

9.8 m/s/s

Question 21

if a driver falls off a 10-meter board with no air resistance, what is his velocity at (a) 1 second (b) 2 seconds (c) 3 seconds?

Answer 21

(a) 10 m/s
(b) 20 m/s
(c) 30 m/s

Question 22

If a canon is shot from ground level up at 100 m/s, what is the velocity after (a) 1 second (b) 5 seconds (c) 10 seconds

Answer 22

(a) 90 m/s
(b) 50 m/s
(c) 0 m/s

Question 23

What is friction?

Answer 23

Rubbing force, or a force that slows down objects when in contact

Question 24

Scenario: A shopping mall is having problems with shoppers slipping and falling when walking up the steps to get to the 2nd floor. What is the problem(physics perspective) and provide a realistic solution?

Answer 24

Too little friction, use grip tape or apply carpet if stairs are tile