Grade 10 Science Physics: Forces

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Presentation transcript:

Grade 10 Science Physics: Forces

What is Force? Force is a push or a pull on something.

Which of the following objects feels a force? A soccer ball being kicked Foot pushes, Gravity pulls A book sitting on a table Gravity pulls, Table pushes up An airplane flying Gravity pulls, Air pushes back

Which of the following objects feels a force? A rock in deep space No force, No gravity The space shuttle orbiting Earth Gravity pulls The Earth Sun’s and moon’s gravity pulls

Which of the following objects feels a force? A calculator sliding across a desk Gravity pulls, desk pushes back You, right now Gravity pulls, chair pushes up A fish in the ocean Gravity pulls, air inside pushes up

All things at all times on Earth feel one or more forces. __________ pulls things towards the centre of the earth. Gravity __________ pushes against things that are moving. For example, cars feel air resistance. Friction __________ forces push against other forces. For example, a table pushes up on a book. Normal

All things at all times on Earth feel one or more forces. __________ forces push or pull things that have an electric charge. Electric __________ forces push or pull things that are magnetic. Magnetic The ________________ force keeps the nucleus inside the atoms together. nuclear strong The ________________ force makes atoms change into different atoms. nuclear weak

Try to list as many forces as you can that affect the soccer ball Sitting on the ground Gravity, normal from the ground On the ground getting kicked Gravity, normal on the ground, push from foot Flying through the air after being kicked Gravity, air resistance

Try to list as many forces as you can that affect the soccer ball Rolling on the ground Gravity, normal from the ground, air resistance, ground resistance Rolling to a wall and bumping into it Gravity, normal from ground, normal from wall

What is Net Force? Net force makes things change their motion. Net force = all forces added together

1. A car driving on a straight road at a constant speed of 50 km/hr. Motion Changing No Net Force No 2. A car driving on a straight road speeding up. Motion Changing Yes Net Force Yes

3. A car driving on a straight road slowing down to stop. Motion Changing Yes Net Force Yes 4. A car stopped at a red light. Motion Changing No Net Force No

5. A car driving on a curved road at a constant speed of 50 km/hr. Motion Changing Yes Net Force Yes 6. A car falling straight down towards the ground faster and faster after going off a cliff. Motion Changing Yes Net Force Yes

7. A car falling straight down towards the ground at a constant speed of 250 km/hr. Motion Changing No Net Force No 8. The car’s parachute starts to open and the car falls straight towards the ground more and more slowly. Motion Changing Yes Net Force Yes

9. The parachute is fully opened and the car falls straight towards the ground at a constant speed of 30 km/hr. Motion Changing No Net Force No 10. Based on your answers to questions 1 to 9, does a car need a net force to move? NO!!! 11. Based on your answers to questions 1 to 9, what does a net force do? It causes the car to change its motion.