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- 1. The kinds of Force 1. Weight(w) w = m. g w = weight ( N ) m = mass ( kg ) g = gravitational acceleration ( m/s2 ) w
- 2. 2. Normal Force (N) • Normal force is the contact force which acts in perpendicular direction to the contact plane. N N w α w • w=N w≠N • N = w cos α
- 3. 3. String Tension Force ( T ) • String tension Force is the force which is transmitted through a string or wire T F T T T
- 4. 4. Friction Force ( f ) • Force which opposes the direction of objects motion is frictional force. v F f Friction force
- 5. Free body diagram N w • N=w
- 6. T w T=w
- 7. N W cos α W sin α N = w cosα W
- 8. exercise • 1. a cube at rest on smooth floor receives a horizontal force of 100 N and moves accelerated. If the cube has 5 kg in mass determine : • A. acceleration of cube • B. distance travelled by the cube after 10 second
- 9. 2. An object is rest on a smooth floor and it is applied force as in the following figure,if the object moves 10 m at 5 s, determine : a. acceleration of the object b. mass of object c. Normal force. 80 N 45o 120 N
- 10. 3. Two object each 2 kg and 1 kg is connected with a string and pulled by a constant force of 24 N, as shown in the figure, then the magnitude of the string tension force is … 2 kg 1 kg
- 11. 4. Look at the following figure, based on the figure determine the string tension force of T1 and T2 : T1 12 kg T2 8 kg
- 12. 5. look at following figure,based of figure determine : a. Free body diagram b. the system acceleration c. force resultan on each cube d. contact force on each cube F=400N 15kg 20 kg 45 kg
- 13. 6. Look at the values of the following figure. If the mass of the object is 20 kg, the values of the tension strength between T1 and T2 are … o 60 o 30 T1 T2 T
- 14. 7. A person with mass 60 kg is in lift which a moving downward with 2. The presure of acceleration 3 m/s the person on the lift floor if the gravitational acceleration is 10 m/s2 is …
- 15. 8. Look at the pulley system in the following figure. The masses of the load A and B are 5 kg and 3 kg respectively. Calculate acceleration of the blocks system and tension of the string. B A

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