Directions: Read each item carefully then write the letter of the best answer in the blank before the number,
1. Why is it harder to push a box with a load on a rough floor?
A. The metal presses the box to the floor. B. The box sticks to the floor Friction decreases the weight
D. More friction needs to be overcome.
2. Which surface does a car run faster? Why?
A. Rough surface because it has less friction
B. Rough surface because it has much friction
C. Smooth surface because it has less friction
D. Smooth surface because it has much friction
3. How does friction affect movement of an object?
A. It makes an object move on different direction
B. It makes an object move on different speed
C. It makes an object moves slower and faster
D. It makes an object fall.
4. The ball rolled on the grassy surface of the park and suddenly stop. How does friction affect the motion of
the ball?
A Friction slows down the rolling of the ball and prevents the ball to move farther
B. Friction opposes the direction of the ball to change its direction
C. Friction decreases the time of the ball to take farther distance
D. Friction affects the ability of the ball to take more rolling
5. The boat is sailing on the sea slows down. What kind of friction is acting on it?
A. Static friction B Rolling friction
C. Fluid friction D. Sliding friction
6. How will you walk if the surface of the floor is slippery?
A Walk slowly
B. Walk fast
C. Walk rapidly D. Walk quickly
7. Andrew found that it is easier to push a cart barefooted than when he was wearing shoes along the
cemented floor. What caused this difference?
A. Surface of the floor is smooth
B. Mass of the wheelbarrow and the load
C. Friction is greater between the wheels of the cart and the shoes.
D. Friction between the bare feet and the ground is greater than with shoes.
8. What causes a rubber ball that rolls on a smooth floor to slow down and then stop?
A. The force that started the ball rolling does not act on the ball anymore.
B. The wax and dirt that collect on the ball makes the ball stick to the floor.
C. The friction between the ball and the floor prevents the ball to continue rolling.
D. The force that made the ball roll is not large enough to make the ball continue to roll.
9. The speed of a ball thrown upward decreases until it stops and moves downward. What force acts on
moving ball?
D. electricity
A friction
C. gravity
B. inertia
10. What factor causes the motion of the car to slow down, as it is moving up the slope of a mountain
A. The force of the car that decreases as it goes up the slope.
B. The gravity of the earth that pulls the car down the slope.
C. The weight of the car that increases as it moves up a mountain​