Introduction Vocabulary words 1 Force push or pull

Introduction Vocabulary words: 1. Force – push or pull or twist 2. Contact force- force that unseen that has contact with the other object 3. Non-contact force-unseen force that does not have any contact with the other object. 4. Newton(N)- unit to measure force, ( 1 kg = 10 N) 5. Spring balance- a weighing scale used to measure forces.

Introduction Vocabulary words: 6. Weight – pulling of force of gravity ; force that depends on the mass of an object. (Unit is to measure weight is Newton (N)) 7. Mass- is the amount of matter an object contains and does not change. Unit to measure mass is kg or g. 8. Lift – is an upward force that allows an aircraft to stay in the air 9. Thrust – is push force ( a forward force) that gets an object moving.

Introduction Vocabulary words: 10. Drag/Air resistance – is the force that provide backward force 11. Streamlined – allows the object to move easily through air and water 12. Upthrust – is the force that push you up with the same force that your weight push you up. 13. Bouyancy- the force keeping the ship from sinking 14. Cohesion – the force in the water that attract particles together

Introduction Vocabulary words: 15. Surface tension – is the cohesion at the surface of the water 16. Motion – change in position 17. Speed – is the measure how fast is the object moving ( distance/Time) 18. Velocity – The speed and the direction of the object 19. Acceleration – a change in either the speed or the direction of an object

The person behind force ! Sir Isaac Newton Who is Isaac Newton? http: //gardenofpraise. com/ibdnewt. htm http: //www. youtube. com/watch? v=1 XJkv. Myupds& feature=related http: //www. youtube. com/watch? v=YE 1 d. Ot. Hl 8 p. M &feature=related http: //www. youtube. com/watch? v=RHtq. Dn. IKm 7 s &feature=related

Force: Push or Pull What forces do? A force is anything that changes in motion. If force ( push or pull)is applied on any objects it can : Change its speed and direction ( acceleration) Stop moving Slow down ( deceleration e. g. you apply the brakes or you go uphill) Twist or change its shape ( sometimes the change is permanent but sometimes it bounce back) The size

EXAMPLE: An object that is not being pushed or pull by some force will stay still or will keep moving in a straight line at a steady speed Example. A bicycle will not move unless someone will push or pull it