Question 1

A ball is dropped from rest from a tall building. Neglecting air resistance, what is the speed of the ball after 3 seconds? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$30\ \mathrm{m/s}$$

Question 2

Which of the following best describes Newton's First Law of Motion?

Accepted Answer

An object will remain at rest or move with constant velocity unless acted upon by a net external force.

Question 3

A crate is being pushed across a floor with a steady speed in a straight line. If the frictional force is $$75\ \mathrm{N}$$, what is the magnitude of the applied force?

Accepted Answer

$$75\ \mathrm{N}$$

Question 4

If you toss a coin straight up while riding in a van moving at constant speed, where will the coin land (neglecting air resistance)?

Accepted Answer

Back in your hand

Question 5

Which of the following is a correct statement about inertia?

Accepted Answer

Inertia is the property of matter to resist changes in motion.

Question 6

A stone is thrown vertically upward with an initial speed of $$20\ \mathrm{m/s}. $$How long will it take to reach its maximum height? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$2\ \mathrm{s}$$

Question 7

Which of the following is an example of a non-contact force?

Accepted Answer

Gravity

Question 8

A car is moving at a constant speed on a straight, frictionless road. What is the net force acting on the car?

Accepted Answer

$$0\ \mathrm{N}$$

Question 9

A 2 kg object is in mechanical equilibrium. Which of the following must be true?

Accepted Answer

The net force on the object is zero.

Question 10

A ball is thrown upward and reaches its maximum height. What is the velocity and acceleration of the ball at the topmost point?

Accepted Answer

Velocity is $$0\ \mathrm{m/s}$$, acceleration is $$-10\ \mathrm{m/s^2$}$$

Question 11

Which of the following statements about mechanical equilibrium is correct?

Accepted Answer

An object in mechanical equilibrium has zero net force acting on it.

Question 12

A box is pulled to the right with a force of $$10\ \mathrm{N}$$ and to the left with a force of $$7\ \mathrm{N}. $$What is the net force acting on the box?

Accepted Answer

$$3\ \mathrm{N}$$\ to\ the\ right

Question 13

Which of the following best explains why wearing a seatbelt is important in a moving car?

Accepted Answer

It prevents your body from continuing to move forward due to inertia if the car stops suddenly.

Question 14

A 5 kg object is at rest on a flat surface. What is the normal force acting on the object? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$50\ \mathrm{N}$$

Question 15

Which of the following is a vector quantity?

Accepted Answer

Force

Question 16

A student stands on a skateboard at rest. If the student throws a heavy ball forward, what will happen to the student?

Accepted Answer

The student will move backward due to conservation of momentum and inertia.

Question 17

If an object is moving with uniform speed in a straight line on a frictionless surface, how much force is required to maintain its motion?

Accepted Answer

$$0\ \mathrm{N}$$

Question 18

Which of the following best describes the difference between static and dynamic equilibrium?

Accepted Answer

Static equilibrium refers to objects at rest, while dynamic equilibrium refers to objects moving at constant velocity.

Question 19

A 1 kg object is dropped from rest. How far does it fall in 2 seconds? (Use $$g = 10\ \mathrm{m/s^2$}$$ and $$d = \frac{1}{2}gt^2$)

Accepted Answer

$$20\ \mathrm{m}$$

Newton's First Law, Inertia, and Free Fall: module 2 lecture 4

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