Physics Unit 2 Test

Significant Figures

100

How many significant figures are in 10.5m?

3

200

How many significant figures are in 1000.m/s?

4

300

What is 3.00m + 2.5m with proper significant figures and units.

5.5m

400

What is 150m / 35s with proper significant figures and units.

4.3m/s

500

What is (1/2)x(-9.81m/s²)x(3.0s)² with proper significant figures and units?

44m

Vocab

100

What is the difference between a scalar and vector? (What does one have that the other doesn't?)

Direction

200

This variable is defined as the rate of change in position.

Velocity

300

This variable is defined as the rate of change in velocity.

Acceleration

400

This term (be specific) is 0 when an object is at the very top of its motion.

v_y

500

What is the mathematical definition (written as equation) for Δx.

x_f-x_i = Δx

Kinematic Equations

100

v_f² = v_i² + 2aΔx

Solve for v_f

v_f = √(v_i² + 2aΔx)

200

v_f = v_i + at

Solve for time

(v_f - v_i) / a

300

Find an equation that would let you solve for time given you know the following variables: 

v_f, v_i, Δx 

You do NOT need to solve the equation for time. Just write the equation.

Δx = (1/2) (v_i + v_f) t

400

Find and solve an equation for acceleration with the following givens:

v_i, v_f, Δx

v_f² = v_i² + 2aΔx

(v_f² - v_i²) / 2Δx = a

500

Solve for time given:

v_i = 0, Δx = 80m, a = 10m/s²

Δx = v_it + (1/2)at²

√((2Δx) / a) = t

√(2(80m) / 10m/s²) = 4s

Vector Addition

100

To be able to add and subtract vector they must be broken up into x ________ and y ___________. Each blank is the same word.

Components

200

What would be the LENGTH of the resultant of adding the following 2 vectors:

A = 7.00m East

B = 5.00m South

8.60m

300

What would be the ANGLE of the resultant of adding the following 2 vectors:

A = 7.00m East

B = 5.00m South

54.5° S of E

400

What would be the length AND angle of adding the following vectors:

A = 4.00m South

B = 3.00m West

5.00m at 53.1° S of W

500

What are the two names of how vectors can be represented? The names are based on how they are reported. 

Vector Component form (5.00m West, 10.0m North)

Angular Form (11.2m at 63.4° N of W)

Projectile Motion

100

This value is 0 when an object is at the top of its motion.

v_y

200

This value is the same throughout the objects motion because acceleration is only in the y direction.

v_x

300

What acceleration does a projectile experience? Give both the symbol used as well as the value with units.

g=-9.81m/s²

400

If an object is traveling 5m/s upwards when an object is 1m above the ground, what is its velocity when it is traveling downwards and is at a height of 1m?

-5m/s

500

An object is thrown at an angle of 30.00° with a speed of 19.62m/s. How long does it take to reach the top of its motion.

sin(θ) = opposite / hypotenuse = v_iy / v_i

v_i sin(θ) = v_iy = 19.62m/s sin(30.00°)

v_fy = 0, a = g = -9.81m/s²

(v_fy - v_iy) / t = a => (v_fy - v_iy) / a = t

(0 - 9.81m/s) / (-9.81m/s) = 1.00s