Force test

Question 1

The firefighter feels the hose pushing backwards onto him as he uses it to put out the fire. What is the most likely cause of this?

Answer 1

The escaping water exerts an equal and opposite force on the hose

Concept 3 Notes: Newton’s Laws of Motion
Pg. 20

Question 2

The relationship among mass, force, and acceleration is explained by

Answer 2

Newton’s 3rd law of Motion

Concept 3 Notes: Newton’s Laws of Motion
Pg. 23

Question 3

For any object, the greater the force that’s applied to it, the greater it’s _ will be.

Answer 3

Acceleration

Concept 3 Notes: Newton’s Laws of Motion
Pg. 22

Question 4

The size of the gravitational force between two objects depends on their

Answer 4

Masses and the distance between them

Concept 3 Notes: Newton’s Laws of Motion
Pg. 22

Question 5

A baseball player swings his bat and misses the ball but hits a fly that was hovering over home plate. The acceleration of the fly compared to what the acceleration of the ball would have been with the same force applied to it would be

Answer 5

Larger

Concept 3 Notes: Newton’s Laws of Motion
Pg. 23

Question 6

A 500 N force is applied to a 25m/s2 object. The mass of the object is

Answer 6

20kg

Concept 3 Notes: Newton’s Laws of Motion
Pg. 22

Question 7

When two forces on the same object are equal and opposite, these forces are called _ forces

Answer 7

Balanced

Concept 3 Notes: Newton’s Laws of Motion
Pg. 20

Question 8

What is the acceleration of the box in the picture to the right?

Answer 8

12m/s 2

Concept 3 Notes: Newton’s Laws of Motion
Pg. 21

Question 9

A man weighing 800 N is standing on a chair. In order to support the man, what force is the chair exerting?

Answer 9

800 N up

Concept 3 Notes: Newton’s Laws of Motion
Pg 21

Question 10

Which of the following best describes how a swimmer moves through the water?

Answer 10

The swimmer pushes backwards on the water and the water pushes with an equal but opposite force back on the swimmer

Concept 3 Notes: Newton’s Laws of Motion
Pg 22

Question 11

A student drops a feather and a rock at the same time from Mrs. Taylor’s window. If air resistance wasn’t a factor, what should she observe?

Answer 11

The Rock falls faster than the feather

Concept 3 Notes: Newton’s Laws of Motion
Pg. 21

Question 12

Tendency of an object to resist changes in motion.

Answer 12

Inertia

Concept 3 Notes: Newton’s Laws of Motion
Pg. 20

Question 13

Related to the amount of force needed to change an objects motion

Answer 13

Law of Conservation of Momentum

Concept 3 Notes: Newton’s Laws of Motion
Pg 23

Question 14

Why does someone not wearing a seatbelt in a car fly forward when the car stops suddenly?

Answer 14

Because objects in motion resist a change in motion, due to inertia
1st law

Concept 3 Notes: Newton’s Laws of Motion
Pg. 20

Question 15

Why does it take more effort to make a bowling ball accelerate 25m/s2 than to make a tennis ball accelerate 25m/s2

Answer 15

2nd law

Concept 3 Notes: Newton’s Laws of Motion
Pg. 22

Question 16

What speed will the skydiver eventually reach? What is this speed called?

Answer 16

55m/s
Terminal velocity

Concept 3 Notes: Newton’s Laws of Motion
Pg. 22

Question 17

Why does this occur?

Answer 17

Gravity and air resistance became balanced

Concept 3 Notes: Newton’s Laws of Motion
Pg. 20

Question 18

Calculate the mass of an object accelerating at 14 M/S squared with a force of 280N

Answer 18

M= ?