Quiz about Unit 2 review! -Physical Science

Question 1

Which of the following best describes static friction?

Accepted Answer

The frictional force that acts on objects that are not moving.

Answer

The frictional force that opposes the motion of an object sliding over a surface.

Answer

The frictional force that acts on rolling objects.

Answer

The frictional force that opposes the motion of an object through air.

Question 2

If a car accelerates from rest at a rate of $$3 \, ext{m/s}^2$$ , what will its acceleration be after 4 seconds?

Accepted Answer

$$12 \, ext{m/s}$$

Answer

$$3 \, ext{m/s}$$

Answer

$$7 \, ext{m/s}$$

Answer

$$15 \, ext{m/s}$$

Question 3

Which of the following factors does NOT affect the gravitational force between two objects?

Accepted Answer

The volume of the objects

Answer

The mass of the objects

Answer

The distance between the objects

Answer

The gravitational constant

Question 4

According to Newton's first law of motion, what will happen to an object at rest if no external force is applied?

Accepted Answer

It will remain at rest.

Answer

It will start moving.

Answer

It will accelerate.

Answer

It will change direction.

Question 5

A ball is thrown straight up into the air. At the highest point of its path, what is the ball's velocity and acceleration?

Accepted Answer

Velocity is zero, acceleration is $$9.8 \, ext{m/s}^2$$ downward.

Answer

Velocity is zero, acceleration is zero.

Answer

Velocity is $$9.8 \, ext{m/s}$$ upward, acceleration is zero.

Answer

Velocity is $$9.8 \, ext{m/s}$$ downward, acceleration is $$9.8 \, ext{m/s}^2$$ downward.

Question 6

Which of the following is an example of kinetic energy?

Accepted Answer

A moving car

Answer

A book sitting on a shelf

Answer

A compressed spring

Answer

A stretched rubber band

Question 7

What materials are necessary for magnetism to exist?

Accepted Answer

Ferromagnetic materials like iron, nickel, and cobalt

Answer

Only non-metallic materials

Answer

Only metallic materials

Answer

Any type of material

Question 8

A 5 kg object is moving with a velocity of 10 m/s. What is its kinetic energy?

Accepted Answer

250 J

Answer

25 J

Answer

50 J

Answer

500 J

Question 9

How does the gravitational force between two objects change if the distance between them is doubled?

Accepted Answer

It becomes one-fourth as strong.

Answer

It becomes four times stronger.

Answer

It becomes twice as strong.

Answer

It becomes half as strong.

Question 10

Which of Newton's laws explains why you feel a push backward when you push against a wall?

Accepted Answer

Newton's third law

Answer

Newton's first law

Answer

Newton's second law

Answer

None of Newton's laws

Question 11

A 10 kg object is at a height of 5 meters. What is its potential energy? (Use $$g = 9.8 \, ext{m/s}^2$$ )

Accepted Answer

490 J

Answer

49 J

Answer

98 J

Answer

980 J

Question 12

Explain how the concept of vectors is used to describe motion.

Accepted Answer

Vectors are used to describe the direction and magnitude of an object's motion.

Answer

Vectors are used to describe the speed of an object.

Answer

Vectors are used to describe the mass of an object.

Answer

Vectors are used to describe the color of an object.

Question 13

A magnet is placed near a pile of iron filings. Describe the pattern that the iron filings will form and explain why.

Accepted Answer

The filings will align along the magnetic field lines because they are attracted to the magnet.

Answer

The filings will form a random pattern because they are not affected by the magnet.

Answer

The filings will form a circular pattern because they are repelled by the magnet.

Answer

The filings will form a straight line because they are unaffected by the magnetic field.

Question 14

A car is moving at a constant speed on a straight road. Which of Newton's laws explains why the car continues to move at this speed?

Accepted Answer

Newton's first law

Answer

Newton's second law

Answer

Newton's third law

Answer

None of Newton's laws

Question 15

Design an experiment to demonstrate the effect of air friction on falling objects. Describe the materials you would use and the procedure you would follow.

Accepted Answer

Use a vacuum chamber and two objects of different masses to compare their fall times.

Answer

Use a stopwatch and a feather to measure the time it takes for the feather to fall.

Answer

Use a fan and a piece of paper to observe how air friction affects the paper's fall.

Answer

Use a ruler and a ball to measure the distance the ball falls.

Question 16

Which of the following best describes the concept of inertia?

Accepted Answer

The tendency of an object to resist changes in its state of motion.

Answer

The force that opposes the motion of an object through a fluid.

Answer

The rate of change of velocity of an object.

Answer

The energy stored in an object due to its position.

Question 17

What is the effect of increasing the mass of an object on its gravitational potential energy, assuming height remains constant?

Accepted Answer

The gravitational potential energy increases.

Answer

The gravitational potential energy decreases.

Answer

The gravitational potential energy becomes zero.

Answer

The gravitational potential energy remains the same.

Question 18

What is the acceleration due to gravity on the surface of the Earth?

Accepted Answer

9.8 m/s2

Answer

7.8 m/s2

Answer

8.9 m/s2

Answer

10.8 m/s2

Question 19

Which of the following is an example of potential energy?

Accepted Answer

A rock at the edge of a cliff

Answer

A flowing river

Answer

A spinning top

Answer

A car driving on a highway

Question 20

What happens to the kinetic energy of an object if its velocity is doubled?

Accepted Answer

It quadruples.

Answer

It remains the same.

Answer

It doubles.

Answer

It halves.

Unit 2 review! -Physical Science

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