Force and Motion

Grade 6 Science Worksheets

Home | 6th Grade Science Worksheets | Force and Motion

Schedule a Free session to clear worksheet doubts

Loading...

 

What Is Force?

You push a cart or squeeze a piece of clay. You pedal a bicycle or kick a football. In all these actions you are applying force. Force is something that changes the motion or shape of an object.The examples mentioned are all Mechanical Forces, where one object touches another. There are many other types of forces – electricity, gravitation, magnetism, which act without contact among objects. For now, we will focus only on mechanical forces.

Schedule a Free session to clear worksheet doubts

No credit card required, no obligation to purchase.
Just schedule a FREE Sessions to meet a tutor and get help on any topic you want!

What is Motion?

Motion is when an object changes its location in space. Motion is relative to another object rather than absolute.

If you are sitting in a moving train, a person on the platform sees you in motion. However, the person sitting next to you in the same train sees you perfectly still. Motion is determined by the difference between the positions of the two objects or observers.

Similarly, if you are in a moving car and there’s another car alongside, moving slightly faster than yours, you see a very small difference in motion with respect to your car or your position. Yet, both cars would appear as moving very fast to a stationary observer.

Every motion is in relation to some other place or object in the Universe – it is with respect to a Frame of Reference. Every motion is an Apparent Motion with respect to that frame of reference.

Force and Motion are related

An object at rest can only be put into motion by a cause. When you push a stationary cart, it starts to move. This cause is the force you’ve applied. Force can cause an object to move, it can cause an object to change direction, and it can cause an object to slow down and stop.

When you hit a ball coming towards you, you are applying force to change the direction of that ball. When you roll a ball on a rough carpet, it eventually slows down because Friction (a kind of force) between the carpet and the ball slows the ball down.

There cannot be moved without a force. And, a force always causes motion or a change in motion.

Personalized Online Tutoring

eTutorWorld offers affordable one-on-one live tutoring over the web for Grades 2-12, Test Prep help for Standardized tests like SCAT, CogAT, SSAT, SAT, ACT, ISEE and AP. You may schedule online tutoring lessons at your personal scheduled times, all with a Money-Back Guarantee. The first one-on-one online tutoring lesson is always FREE, no purchase obligation, no credit card required.

For answers/solutions to any question or to learn concepts, take a FREE Demo Session.

No credit card required, no obligation to purchase.
Just schedule a FREE Sessions to meet a tutor and get help on any topic you want!

What is Speed?

Speed is how we measure motion. It is a function of time and distance – how far an object has moved in a period of time. It is the ratio of distance over time. A car that has traveled 60 kilometers in one hour implies that its speed is 60 kilometers per hour.

In reality, the car would have moved at different speeds over the hour. It would have started from rest (zero speed) and then gradually increased its speed over the hour so as to cover 60 kilometers. Hence, speed is often referred to as Average Speed.

Speed (or Average Speed) = Distance/Time

What is Velocity?

Speed does not indicate the direction of motion. When we include direction in the motion of an object, then we are referring to the Velocity of the object. For example, an object that is moving south at 60 kilometers per hour, indicates its velocity – it has magnitude (speed) as well as direction (south). Velocity is the Displacement of an object rather than the distance traveled. It is a displacement per time ratio in a particular direction.

What is Uniform and Non-Uniform Motion?

When both the speed and direction of a moving object are constant, the motion of the object is said to be Uniform – it covers equal distance in equal intervals of time.

A car that covers 30 meters in every second is said to have a uniform speed of 30 meters per second.

An object that covers unequal distances in equal intervals of time is said to have Non-uniform motion. A horse that runs a race at different speeds at different points of time would be a good example.

What are Acceleration and Deceleration?

If the velocity of an object changes (increases) from one time period to another, the object is undergoing an Acceleration. Or, if the velocity decreases from one time period to another, the object is undergoing a Deceleration (also called Negative Acceleration).

A car that moves at 10 miles per hour for the first minute, then at 20 miles per hour for the second minute, and finally at 30 miles per hour for the third minute, would be said to have a Uniform Acceleration of “10 miles per hour per minute”. If the car slowed down at the same rate it would be a Uniform Deceleration. If the rates of acceleration or deceleration vary from one time period to another, then it is said to have Variable Acceleration or VariableDeceleration.

Acceleration = Final velocity – Starting velocity

Elapsed Time

For example, if a car accelerates from 0 miles per hour to 60 miles per hour in 30 seconds then the acceleration of the car would be –

Acceleration =

60 – 0

30

= 2 miles per hour per second

 

Check Point

  1. ______ can change the motion or shape of an object.
  2. When an object changes its location in space, it is referred to as its ______.
  3. Motion is always in relation to some other place or object in the universe – it is with respect to a ________.
  4. ______ is the ratio of distance over time.
  5. When the velocity of an object increases from one time period to another, the object is said to undergo an _______.

Answer Key

  1. Force
  2. Motion
  3. Frame of Reference
  4. Speed
  5. Acceleration

Schedule a Free session to clear worksheet doubts

No credit card required, no obligation to purchase.
Just schedule a FREE Sessions to meet a tutor and get help on any topic you want!

Pricing for Personalized Online Tutoring

Tutoring Package Validity Grade (1-8) Grade (9-12), College
New Student Special (5 sessions) 1 Month $89 $99
1 session 1 Month $22 $24
5 sessions 3 months $104 $114
10 sessions 3 months $199 $219
15 sessions 3 months $289 $319
20 sessions 4 months $379 $409
50 sessions 6 months $899 $949

©2020 eTutorWorld           Terms of use            Privacy Policy            Site by Little Red Bird          

©2020 eTutorWorld
Terms of use
Privacy Policy
Site by Little Red Bird

SPECIAL HALLOWEEN DISCOUNT

 

♦ Coupon HALO10 for a 10% Discount on all Tutoring Packs

♦ Coupon TEST20 for a 20% Discount on all SCAT, SSAT, CogAT & Enrichment Online Practice Packs

You have Successfully Subscribed!