B. Directions: Choose the letter of the correct answer.
1. What makes a rolling ball slow down and stop.?
a. Air resistance
b. brake
c. friction
d. gravity
2. Which of the following needs more frictions?
a. A ball on slippery board
b. A car running on rough roads.
c. A ballet dancer dancing on the floor
d. A bicycle running on cemented roads.
3. Why does the vehicle have brakes?
a. To make vehicles move faster.
b. To move the vehicle to any direction.
c. to slow down a moving vehicle.
d. to move the vehicle easily.
4. Which shows that more friction is useful?
a. Wheels of cars have jagged surface
b. A bowling lane is smooth
c. Heavy appliances have rollers
d. Slides have smooth surface
5. Why are oil and lubricants applied to a machine's parts?
a. To make the parts rub from the other parts.
b. To move the parts slower.
c. To reduce friction between the moving parts.
d. To increase friction between the moving parts.
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Answer:
1. What makes a rolling ball slow down and stop.?
a. Air resistance
b. brake
C. friction
d. gravity
2. Which of the following needs more frictions?
a. A ball on slippery board
b. A car running on rough roads.
c. A ballet dancer dancing on the floor
d. A bicycle running on cemented roads.
3. Why does the vehicle have brakes?
a. To make vehicles move faster.
b. To move the vehicle to any direction.
c. to slow down a moving vehicle.
d. to move the vehicle easily.
4. Which shows that more friction is useful?
a. Wheels of cars have jagged surface
b. A bowling lane is smooth
c. Heavy appliances have rollers
d. Slides have smooth surface
5. Why are oil and lubricants applied to a machine's parts?
a. To make the parts rub from the other parts.
b. To move the parts slower.
c. To reduce friction between the moving parts.
d. To increase friction between the moving parts.
Explanation:
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answer
1.C
2.D
3.A
4.A
5.D