Unit 2: Forces

units and constants

100

What is the unit of Time?

Second

200

What is the value of Earth's gravitational acceleration?

9.81 m/s²

300

What is the unit of Force

N 

400

What is the unit of momentum? 

kg m/s

500

What is the unit of impulse?

N s

physical quantity

100

What physical quantity is defined as "a push or a pull exerted on an object resulting from its interaction with another object."

Force

200

What physical quantity is defined as "the rate at which an object's velocity changes with respect to time."

Acceleration

300

What is the physical quantity defined as "the quantity of motion of a moving body"

Momentum

400

What physical quantity is defined as "the measure of the change in an object's momentum resulting from a force acting over time"

Impulse

500

What physical quantity is defined as "the indefinite continued progress of existence and events in the past, present, and future regarded as a whole"

Time

Formulas

100

Write the formula for velocity

 s / t 

200

Write the formula for accelaration

vf-vi / t 

300

Write the formula for force 

F = m a

400

Write the formula for Momentum

 p= m v 

500

Write the formula for conservation of momentum.

m_1i v_1i + m_2i v_2i = m _1f v_1f + m_2f v_2f

vector or scalar

100

Vector or scalar: distance

Scalar 

200

Vector or scalar:Force

Vector

300

Vector or scalar:time

scalar

400

Vector or scalar: momentum 

Vector 

500

Vector or scalar: Impulse 

Vector 

Solve the problem

100

A 6.0 kg object undergoes an acceleration of 2.0 m/s2. What is the magnitude of the resultant force acting on it? 

F= 12 N

200

A sprinter with a mass of 75.0 kg running at 10.0 m/s. determine the momentum. 

P= 750  kg m/s

300

An object has a kinetic energy of 275 J and a momentum of magnitude 25.0 kg m/s. Find the speed and mass of the object.

v = 22.12 m/s

400

A baseball player with a mass of 84.0 kg is running at 6.70 m/s when he slides into home plate.  If the slide lasts 0.750 s, What is the impulse?

J = -562.8 kg m/s

500

High-speed stroboscopic photographs show that the head of a 200-g golf club is traveling at 55 m/s just before it strikes a 46-g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 40 m/s. Find the speed of the golf ball just after impact.

v= 65.21 m/s