Question 1

A car moves at a constant speed around a circular track, as shown in the first image. Which of the following statements is correct about the car's acceleration?

Accepted Answer

The car is accelerating because its direction of motion is changing.

Question 2

Galileo used a ramp with bells (second image) to study motion. He found that if the bells were placed at distances proportional to $$1^2$$ : $$2^2$$ : $$3^2$$ : $$4^2$$, what did this reveal about the relationship between distance traveled and time for an object rolling down the ramp?

Accepted Answer

Distance is proportional to the square of time.

Question 3

Refer to the third image showing balls rolling up different inclines. According to Galileo's concept of inertia, what happens to a ball rolling on a perfectly horizontal surface (no friction)?

Accepted Answer

It continues moving at constant speed indefinitely.

Question 4

A ball is thrown straight up with an initial velocity of $$30\ \mathrm{m/s}$$, as shown in the fourth image. What is the ball's velocity and acceleration at the highest point of its trajectory?

Accepted Answer

Velocity is $$0\ \mathrm{m/s}$$ and acceleration is $$10\ \mathrm{m/s^2$}$$ downward.

Question 5

In the fifth image, a coin and a feather fall in a vacuum. Why do they fall at the same rate?

Accepted Answer

Because there is no air resistance.

Question 6

An airplane flies at $$40\ \mathrm{m/s}$$ relative to the air, and a crosswind blows at $$30\ \mathrm{m/s}$$ perpendicular to the plane's direction (see sixth image). What is the plane's speed relative to the ground?

Accepted Answer

$$50\ \mathrm{m/s}$$

Question 7

Refer to the seventh image showing a ball rolling down and up ramps. According to Galileo, what determines how far the ball will travel up the second ramp?

Accepted Answer

The height from which the ball started.

Question 8

An astronaut in deep space shakes an object (eighth image). What property of the object is the astronaut testing?

Accepted Answer

Its inertial mass.

Question 9

The ninth image shows two blocks in contact. What is the main cause of friction between the two surfaces?

Accepted Answer

Microscopic roughness and adhesion between surfaces.

Question 10

In the tenth image, a flying squirrel and a wingsuit pilot both increase their surface area as they fall. What effect does this have on their motion?

Accepted Answer

It increases the drag force, reducing their terminal velocity.

Question 11

A block of mass $$2\ \mathrm{kg} is $$pushed with a force of $$6\ \mathrm{N} on a $$frictionless surface. What is its acceleration?

Accepted Answer

$$3\ \mathrm{m/s^2$}$$

Question 12

A $$1\ \mathrm{kg}$$ block rests on a table. You push with $$2\ \mathrm{N}$$ but it does not move. What is the magnitude and direction of the friction force?

Accepted Answer

$$2\ \mathrm{N} to $$the left

Question 13

A ball is dropped from rest and falls freely for $$2\ \mathrm{s}. $$How far does it fall? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$20\ \mathrm{m}$$

Question 14

Which of the following is a vector quantity?

Accepted Answer

Velocity

Question 15

A block is at rest on a table. You press down with $$8\ \mathrm{N}$$ and the block's mass is $$2\ \mathrm{kg}. $$What is the normal force exerted by the table?

Accepted Answer

$$28\ \mathrm{N}$$

Question 16

A block is pushed across a horizontal floor in translational equilibrium with a $$20\ \mathrm{N}$$ force to the right. What is the magnitude and direction of the friction force?

Accepted Answer

$$20\ \mathrm{N} to $$the left

Physics with Algebra: Mechanics I – Units, Motion, Forces, and Friction

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