1.
Write TRUE if the statement is correct and FALSE if not.
1 A force can start, stop, and change the direction of motion.
2. A force always causes things to move.
3. Gravitational force pulls all things downward.
4. Frictional force is produced when two surfaces, whether smooth or rough,
rub against each other.
5. Friction always acts in a direction opposite to the direction of motion of the
object.
6. Gravity makes it easy for a person to ride a bicycle down the hill.
7. Frictional force is greater between smooth surfaces.
8. Frictional force always causes problems.
9. Oil and grease are examples of lubricants.
10.By using lubricants, we can make strong frictional force decrease.
Write TRUE if the statement is correct and FALSE if not.
1 A force can start, stop, and change the direction of motion.
2. A force always causes things to move.
3. Gravitational force pulls all things downward.
4. Frictional force is produced when two surfaces, whether smooth or rough,
rub against each other.
5. Friction always acts in a direction opposite to the direction of motion of the
object.
6. Gravity makes it easy for a person to ride a bicycle down the hill.
7. Frictional force is greater between smooth surfaces.
8. Frictional force always causes problems.
9. Oil and grease are examples of lubricants.
10.By using lubricants, we can make strong frictional force decrease.
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Answer:
1.true
2.true
3.false
4.true
5.false
6.false
7.true
8.true
9.true
10.false