Newton's Laws, Torque, FBD's Review

Question 1

Which of Newton's Laws states that F=ma?

Accepted Answer

The second law

Question 2

If it takes a force of 100 N to accelerate my fridge by 0.2 m/s^2, what is its mass?

Accepted Answer

500 kg

Question 3

If I apply a force of 20 N to an object with a mass of 10 kg, by how much will it accelerate?

Accepted Answer

2 m/s^2

Question 4

What is the force that acts directly upward from a horizontal surface?

Accepted Answer

normal force

Question 5

Which of the following is an example of ZERO NET FORCE acting on an object?

Accepted Answer

A rope pulled equally from opposite ends

Question 6

Which of Newton's Laws is also called the "force pairs" law?

Accepted Answer

The third law

Question 7

Which door would be the easiest to open?

Accepted Answer

A door with the handle far from the hinges

Question 8

What is a force?

Accepted Answer

A push or a pull

Question 9

What force always works directly downward on all objects near earth?

Accepted Answer

gravitational force

Question 10

If I am moving a 20kg box at a CONSTANT VELOCITY of 5 m/s, what is my NET force?

Accepted Answer

Zero Newtons

Question 11

You are pushing a box to the right. What is the force acting to the LEFT?

Accepted Answer

frictional force

Question 12

Which of Newton's Laws deals with inertia?

Accepted Answer

The first law

Question 13

According to Newton's third law of motion, an action force and its reaction force are…

Accepted Answer

equal in size and opposite in direction

Question 14

If you combine all the forces acting on a basketball, what are you finding?

Accepted Answer

net force

Question 15

A cat is sliding on a frictionless surface. Are the forces balanced or unbalanced?

Accepted Answer

Balanced

Question 16

If you double the mass of an object, what happens to the force needed to accelerate the object?

Accepted Answer

It doubles

Question 17

What is torque?

Accepted Answer

a twisting force

Question 18

Newton's first law is also known as the:

Accepted Answer

law of inertia

Question 19

According to Newton's second law of motion, force equals mass times… (F=m____)

Accepted Answer

acceleration

Question 20

I kick a ball that weighs 2 kg and it accelerates by 5 m/s^2. What was the force of my kick?

Accepted Answer

10 N

Question 21

What unit do we use to measure force?

Accepted Answer

Newton

Questions 21