SlideShare a Scribd company logo
   A force is a push and pull
   All the daily life activities involve push and
    pull.
   Force can not be seen but can be felt.
1.   Force can change shape of an object.
2.   Force can cause a stationary object to
     move
3.   Force can change speed of a moving
     object.
4.   Force can change direction of the moving
     object.
   Friction is a type of force that opposes the
    movement of an object.
   It always acts in the opposite direction to the
    movement of an object.
   Friction occurs when two surfaces are
    contact with each other.
1.  Produces heat
-   When we rub our palms together, the palms
    become warmer because friction produce
    heat.
2. Opposes motion
-   When a toy car is given a push, it will
    move. However, its movement become
    slower and slower. After sometimes, it will
    stops. This is due to the friction between
    its tyres and the floor opposing the motion
    of the toy car.
3. Causes wear and tear
- When a pair of shoes is frequently used, the
  shoes will wear out. The rubbing surfaces
  between the soles and floor causes the shoes
  to wear out. Brakes, tyres and engines also
  wear out after some time due to friction.
The amount of friction depends on:
1. The types of surfaces
- If the surface is rough, it will produce more
   friction than the smooth surface.
2. The mass of an object
- If the mass of an object is bigger, it will
   produce more friction than the small mass
   object.
1.   Using the round and smooth objects like
     rollers and ball bearings.
2.   Using the lubricants like oil, grease and
     wax.
3.   Using air cushion.
4.   Using the fine powder.
   Holding things firmer in place
   Slowing down or stopping moving objects
   Providing better grip on surfaces
   Friction can be increased by increasing the
    roughness of the contact surfaces.
   Enables to hold things in our hand
   Enables objects to stay in place
   Produces heat
   Wears out rubbing surfaces for example
    between the knife and the stone.
   Friction opposes and slow down the motion,
    we need to apply force.
   As the friction produce heat, the heat
    produced may spoil the engine. Cooling
    system must be provided to remove the heat.
   The friction also cause wear and tear. Tyres
    and break pads in vehicles need to be
    replaced from time to time.
   Speed is the measurement of how fast an
    object moves.
   Object that moves faster has greater speed.
   Object that moves slower has lower speed.
  Object that moves faster:
a) Travel longer distance in a given time
b) Takes a shorter time to travel a given
   distance.
   Calculation of speed is as follow:

Speed = distance travelled
            time taken
 to calculate speed, we need to know

a) The distance travelled by the object
b) The time taken to travel the distance
Sam kicked a ball. The ball moved 9 meters
 in 3 seconds. What is the speed?

Speed of the ball = distance travelled
                        time taken

Speed = 9 m
        3s
      = 3m/s
1.   A bus started its journey from Kuala
     Lumpur at 8.30 a.m. It reached Tampin,
     which is 140 km away from Kuala Lumpur,
     at 10.30 a.m. What is the speed?
2.   A ball rolls 8 meters in 2 seconds. What is
     the speed of the ball?
3.   There are two cars. The cars travelled the
     same distance from Johor Bahru to Kuala
     Lumpur. The distance is 300 km. Car A,
     travelled within 3 hours while car B
     travelled within 4 hours. Calculate the
     speed of both cars.

More Related Content

Similar to Investigating force and energy

How do objects move17 18
How do objects move17 18How do objects move17 18
How do objects move17 18
safa-medaney
 
Ch.11.less.1.how are forces and motion related?
Ch.11.less.1.how are forces and motion related?Ch.11.less.1.how are forces and motion related?
Ch.11.less.1.how are forces and motion related?
DrSarahAyoub
 
Ch 150407052236-conversion-gate01
Ch 150407052236-conversion-gate01Ch 150407052236-conversion-gate01
Ch 150407052236-conversion-gate01
omneya_ghis ghis
 
Friction
FrictionFriction
Friction
Anil Yadav
 
How do objects move
How do objects moveHow do objects move
How do objects move
safa-medaney
 
How do objects move
How do objects moveHow do objects move
How do objects move
bassantnour
 
Friction ppt by gaurav ghankhede
Friction ppt by gaurav ghankhedeFriction ppt by gaurav ghankhede
Friction ppt by gaurav ghankhede
Gaurav Ghankhede
 
Friction
FrictionFriction
Friction
FrictionFriction
3RD QUARTER SCIENCE 6 FRICTION01 PPT.pptx
3RD QUARTER SCIENCE 6 FRICTION01 PPT.pptx3RD QUARTER SCIENCE 6 FRICTION01 PPT.pptx
3RD QUARTER SCIENCE 6 FRICTION01 PPT.pptx
SherwinAlmojera1
 
Friction Necessity and Evil, ways to increase Friction
Friction Necessity and Evil, ways to increase FrictionFriction Necessity and Evil, ways to increase Friction
Friction Necessity and Evil, ways to increase Friction
taruna25bhatia
 
Forcess in motion
Forcess in motionForcess in motion
Forcess in motion
Jackiegodden
 
Forcess in motion
Forcess in motionForcess in motion
Forcess in motion
Jackiegodden
 
Forces in motionpowerpoint
Forces in motionpowerpointForces in motionpowerpoint
Forces in motionpowerpoint
Jackiegodden
 
Forces in motionpowerpoint
Forces in motionpowerpointForces in motionpowerpoint
Forces in motionpowerpoint
Jackiegodden
 
Friction notes.PDF
Friction notes.PDFFriction notes.PDF
Friction notes.PDF
ShreyasNarnoli
 
Velocity and Acceleration PowerPoint.ppt
Velocity and Acceleration PowerPoint.pptVelocity and Acceleration PowerPoint.ppt
Velocity and Acceleration PowerPoint.ppt
ssuser5087b61
 
Velocity and Acceleration PowerPoint (1).ppt
Velocity and Acceleration PowerPoint (1).pptVelocity and Acceleration PowerPoint (1).ppt
Velocity and Acceleration PowerPoint (1).ppt
marinirobot
 
Velocity and Acceleration PowerPoint.ppt
Velocity and Acceleration PowerPoint.pptVelocity and Acceleration PowerPoint.ppt
Velocity and Acceleration PowerPoint.ppt
RakeshMohan42
 
Velocity.ppt
Velocity.pptVelocity.ppt
Velocity.ppt
AnuradhaM24
 

Similar to Investigating force and energy (20)

How do objects move17 18
How do objects move17 18How do objects move17 18
How do objects move17 18
 
Ch.11.less.1.how are forces and motion related?
Ch.11.less.1.how are forces and motion related?Ch.11.less.1.how are forces and motion related?
Ch.11.less.1.how are forces and motion related?
 
Ch 150407052236-conversion-gate01
Ch 150407052236-conversion-gate01Ch 150407052236-conversion-gate01
Ch 150407052236-conversion-gate01
 
Friction
FrictionFriction
Friction
 
How do objects move
How do objects moveHow do objects move
How do objects move
 
How do objects move
How do objects moveHow do objects move
How do objects move
 
Friction ppt by gaurav ghankhede
Friction ppt by gaurav ghankhedeFriction ppt by gaurav ghankhede
Friction ppt by gaurav ghankhede
 
Friction
FrictionFriction
Friction
 
Friction
FrictionFriction
Friction
 
3RD QUARTER SCIENCE 6 FRICTION01 PPT.pptx
3RD QUARTER SCIENCE 6 FRICTION01 PPT.pptx3RD QUARTER SCIENCE 6 FRICTION01 PPT.pptx
3RD QUARTER SCIENCE 6 FRICTION01 PPT.pptx
 
Friction Necessity and Evil, ways to increase Friction
Friction Necessity and Evil, ways to increase FrictionFriction Necessity and Evil, ways to increase Friction
Friction Necessity and Evil, ways to increase Friction
 
Forcess in motion
Forcess in motionForcess in motion
Forcess in motion
 
Forcess in motion
Forcess in motionForcess in motion
Forcess in motion
 
Forces in motionpowerpoint
Forces in motionpowerpointForces in motionpowerpoint
Forces in motionpowerpoint
 
Forces in motionpowerpoint
Forces in motionpowerpointForces in motionpowerpoint
Forces in motionpowerpoint
 
Friction notes.PDF
Friction notes.PDFFriction notes.PDF
Friction notes.PDF
 
Velocity and Acceleration PowerPoint.ppt
Velocity and Acceleration PowerPoint.pptVelocity and Acceleration PowerPoint.ppt
Velocity and Acceleration PowerPoint.ppt
 
Velocity and Acceleration PowerPoint (1).ppt
Velocity and Acceleration PowerPoint (1).pptVelocity and Acceleration PowerPoint (1).ppt
Velocity and Acceleration PowerPoint (1).ppt
 
Velocity and Acceleration PowerPoint.ppt
Velocity and Acceleration PowerPoint.pptVelocity and Acceleration PowerPoint.ppt
Velocity and Acceleration PowerPoint.ppt
 
Velocity.ppt
Velocity.pptVelocity.ppt
Velocity.ppt
 

More from Mazlina Mazlan

Organisasi
OrganisasiOrganisasi
Organisasi
Mazlina Mazlan
 
Simple machines
Simple machinesSimple machines
Simple machines
Mazlina Mazlan
 
Simple notes
Simple notesSimple notes
Simple notes
Mazlina Mazlan
 
Investigating the earth and the universe
Investigating the earth and the universeInvestigating the earth and the universe
Investigating the earth and the universe
Mazlina Mazlan
 
Investigating technology
Investigating technologyInvestigating technology
Investigating technology
Mazlina Mazlan
 
Investigating materials
Investigating materialsInvestigating materials
Investigating materials
Mazlina Mazlan
 
Living things
Living thingsLiving things
Living things
Mazlina Mazlan
 

More from Mazlina Mazlan (7)

Organisasi
OrganisasiOrganisasi
Organisasi
 
Simple machines
Simple machinesSimple machines
Simple machines
 
Simple notes
Simple notesSimple notes
Simple notes
 
Investigating the earth and the universe
Investigating the earth and the universeInvestigating the earth and the universe
Investigating the earth and the universe
 
Investigating technology
Investigating technologyInvestigating technology
Investigating technology
 
Investigating materials
Investigating materialsInvestigating materials
Investigating materials
 
Living things
Living thingsLiving things
Living things
 

Investigating force and energy

  • 1.
  • 2. A force is a push and pull  All the daily life activities involve push and pull.  Force can not be seen but can be felt.
  • 3. 1. Force can change shape of an object. 2. Force can cause a stationary object to move 3. Force can change speed of a moving object. 4. Force can change direction of the moving object.
  • 4. Friction is a type of force that opposes the movement of an object.  It always acts in the opposite direction to the movement of an object.  Friction occurs when two surfaces are contact with each other.
  • 5. 1. Produces heat - When we rub our palms together, the palms become warmer because friction produce heat. 2. Opposes motion - When a toy car is given a push, it will move. However, its movement become slower and slower. After sometimes, it will stops. This is due to the friction between its tyres and the floor opposing the motion of the toy car.
  • 6. 3. Causes wear and tear - When a pair of shoes is frequently used, the shoes will wear out. The rubbing surfaces between the soles and floor causes the shoes to wear out. Brakes, tyres and engines also wear out after some time due to friction.
  • 7. The amount of friction depends on: 1. The types of surfaces - If the surface is rough, it will produce more friction than the smooth surface. 2. The mass of an object - If the mass of an object is bigger, it will produce more friction than the small mass object.
  • 8. 1. Using the round and smooth objects like rollers and ball bearings. 2. Using the lubricants like oil, grease and wax. 3. Using air cushion. 4. Using the fine powder.
  • 9. Holding things firmer in place  Slowing down or stopping moving objects  Providing better grip on surfaces  Friction can be increased by increasing the roughness of the contact surfaces.
  • 10. Enables to hold things in our hand  Enables objects to stay in place  Produces heat  Wears out rubbing surfaces for example between the knife and the stone.
  • 11. Friction opposes and slow down the motion, we need to apply force.  As the friction produce heat, the heat produced may spoil the engine. Cooling system must be provided to remove the heat.  The friction also cause wear and tear. Tyres and break pads in vehicles need to be replaced from time to time.
  • 12. Speed is the measurement of how fast an object moves.  Object that moves faster has greater speed.  Object that moves slower has lower speed.
  • 13.  Object that moves faster: a) Travel longer distance in a given time b) Takes a shorter time to travel a given distance.
  • 14. Calculation of speed is as follow: Speed = distance travelled time taken  to calculate speed, we need to know a) The distance travelled by the object b) The time taken to travel the distance
  • 15. Sam kicked a ball. The ball moved 9 meters in 3 seconds. What is the speed? Speed of the ball = distance travelled time taken Speed = 9 m 3s = 3m/s
  • 16. 1. A bus started its journey from Kuala Lumpur at 8.30 a.m. It reached Tampin, which is 140 km away from Kuala Lumpur, at 10.30 a.m. What is the speed? 2. A ball rolls 8 meters in 2 seconds. What is the speed of the ball? 3. There are two cars. The cars travelled the same distance from Johor Bahru to Kuala Lumpur. The distance is 300 km. Car A, travelled within 3 hours while car B travelled within 4 hours. Calculate the speed of both cars.