Question 1

Which of the following best describes the particle model in physics?

Accepted Answer

A model that treats a moving object as if all its mass were concentrated at a single point.

Question 2

A car moves from position $$x_i = -5\ \mathrm{m} to$$ $$x_f = 15\ \mathrm{m} in$$ $$4\ \mathrm{s}. $$What is the car's displacement?

Accepted Answer

$$20\ \mathrm{m}$$

Question 3

Which of the following is a vector quantity?

Accepted Answer

Displacement

Question 4

A runner travels $$100\ \mathrm{m}$$ east and then $$60\ \mathrm{m}$$ north. What is the magnitude of the runner's displacement?

Accepted Answer

$$116\ \mathrm{m}$$

Question 5

Which of the following is NOT a rule for identifying significant figures?

Accepted Answer

Leading zeros are significant.

Question 6

A measurement is recorded as $$0.00450. $$How many significant figures does it have?

Accepted Answer

3

Question 7

Convert $$45,000 to $$scientific notation.

Accepted Answer

$$4.5 	imes 10^4$

Question 8

A hiker walks $$5\ \mathrm{km} at a$$ $$60^\circ$$ angle from east. What is the northward component of the displacement?

Accepted Answer

$$5 \sin(60^\circ)$$

Question 9

Which of the following best describes uniform motion?

Accepted Answer

Motion at a constant speed in a straight line.

Question 10

A car travels $$60\ \mathrm{km} in$$ $$1.5\ \mathrm{h}. $$What is its average speed in $$\mathrm{km/h}$$?

Accepted Answer

$$40\ \mathrm{km/h}$$

Question 11

Which of the following is a derived SI unit?

Accepted Answer

Newton (N)

Question 12

If $$A = 3.0 	imes 10^2$ and B = 2.0$$ 	imes $$10^3$$, what is $$A 	imes B in $$scientific notation?

Accepted Answer

$$6.0 	imes 10^5$

Question 13

A vector has a magnitude $$A$$ and makes an angle $$	heta$$ with the horizontal. What is the horizontal component of the vector?

Accepted Answer

$$A \cos 	heta$$

Question 14

Which of the following is an example of a scalar quantity?

Accepted Answer

Speed

Question 15

A car moves from $$x_i = 10\ \mathrm{m} to$$ $$x_f = -5\ \mathrm{m} in$$ $$3\ \mathrm{s}. $$What is the average velocity?

Accepted Answer

$$-5\ \mathrm{m/s}$$

Question 16

Which of the following is true about time intervals ($$\Delta t) in $$physics?

Accepted Answer

They are always positive.

Question 17

What is the result of $$(6 	imes 10^5$) \div (2 	imes 10^2$)$$?

Accepted Answer

$$3 	imes 10^3$

Question 18

Which of the following best describes the process of subtracting vector $$\vec{B}$$ from vector $$\vec{A}$$?

Accepted Answer

Reverse the direction of $$\vec{B}$$, place its tail at the head of $$\vec{A}$$, and draw the resultant from the tail of $$\vec{A} to $$the head of $$-\vec{B}.$$

Question 19

A measurement is recorded as $$1.20 	imes 10^2$. How many significant figures does it have?

Accepted Answer

3

Question 20

Which of the following is the correct SI unit for force?

Accepted Answer

Newton (N)

Chapter 1: Representing Motion – Physics with Algebra Study Notes

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