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Unbalanced Forces And Friction
Test Description: Review of unbalanced forces and friction
Instructions: Answer all questions to get your test result.
1) In which situation is an object NOT at equilibrium?
A
when it is slowing down
B
when it is moving at a constant speed in a straight line
C
when the forces on it are balanced
D
when it is at rest
2) Which would you expect to have the greatest amount of friction
A
a rough surface and air
B
a smooth surface on a rough surface
C
a smooth surface on a smooth surface
D
a rough surface on a rough surface
3) When would a person most likely want INCREASED friction?
A
when the person operates machinery with moving parts
B
when the person carries glasses on a tray
C
when the person is sliding down a slide
D
when the person is swimming in a race
4) When would a person MOST LIKELY use a lubricant?
A
when using an electric drill
B
when preparing a rink for use by skaters
C
when freezing ice cubes
D
when washing steps on a porch
5) Why are people advised to drive more slowly when it is raining?
A
Wet tires may make it difficult for cars to reach normal speeds.
B
The friction between tires and the road is increased.
C
The friction between tires and the road is decreased.
D
Cars might stop too quickly and without warning.
6) The same force is used to push two boxes across a floor. The mass of Box P is double the mass of Box Q. What is the relationship between the acceleration of the two boxes?
A
The two boxes have about the same acceleration.
B
Box Q’s acceleration is two times greater than Box P’s acceleration.
C
Box P’s acceleration is a little greater than Box Q’s acceleration.
D
Box Q’s acceleration is four times greater than Box P’s acceleration.
7) A soccer ball is rolled across four different surfaces with the same force. Which surface will SLOW the movement of the soccer ball the most?
A
cement sidewalk
B
grassy field
C
tile floor
D
paved road
8) What happens if balanced forces are applied to a moving object?
A
The object stops moving.
B
The object keeps moving at the same speed and direction.
C
The object moves faster in the same direction.
D
he object moves slower in the same direction.
9) Which surface produces the LEAST amount of friction?
A
rocky gravel road
B
smooth ceramic tile
C
grassy soccer field
D
bumpy new carpet
10) Two teams are playing tug-of-war. How can Team A win the tug-of-war game?
A
Team B pulls with a greater force than Team A.
B
Team A pulls with a lesser force than Team B.
C
Team A and Team B pull with the same amount of force, but Team A players use a looser grip.
D
Team A pulls with a greater force than Team B.
*select an answer for all questions
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