# U7 FORCES AND MOTION: Question Preview (ID: 29254)

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Why does a truck carrying a heavy load move uphill slower than an empty truck, even though the engine exerts the same force?
a) The force exerted by the engine has a smaller effect on the truck with greater mass.
b) The force of gravity increases as the heavier truck moves up the hill.
c) The amount of force that the engine exerts is less for a loaded truck, so it moves slower.
d) The trucks move at the same speed, but the empty truck seems to move faster because it has less mass.

When an unbalanced force acts on an object, the motion of the object changes. Sometimes the object continues to move at the same speed. When that happens, what is it that changes?
a) direction
b) friction
c) mass
d) weight

Rosa tried to pound a large nail into a board using a small hammer. Partway into the board, the nail stopped. Rosa switched to using a heavier hammer, and the nail went into the board easily. Why did the larger hammer work?
a) The nail could not push the larger hammer out of the way.
b) There is more friction between a large hammer and the nail.
c) The flat part of the larger hammer was wider, so it hit the nail better.
d) The larger hammer had more mass, so it exerted more force.

Gravity is a force that pulls objects toward Earth's center. How does the gravitational force on a 1-kg block of wood compare to the gravitational force on a 5-kg block of steel, if both are on the ground?
a) The force is the same because both objects are on Earth.
b) No force is exerted on either block because they are not falling.
c) The force exerted on the wooden block is greater than the force exerted on the steel block.
d) The force exerted on the steel block is greater than the force exerted on the wooden block.

Raoul threw a ball into the air and watched it go up. Then it started to fall back toward him. What force caused the ball to start to move downward?
a) friction
b) gravity
c) motion
d) wind

The spring scale shown has a weight attached to it, pulling down. In this arrangement, what is the spring scale being used to measure?
a) gravitational force
b) motion
c) unbalanced force
d) velocity

On two different days, two students measured the force required to hold a pair of scissors using a spring scale. How should the results compare?
a) The results should be the same because the mass of the scissors and the force of gravity are the same.
b) The results should be the same because friction does not change between the two experiments.
c) The results should be different because two people never perform an experiment exactly the same way.
d) The results should be different because changes in conditions between different days will cause the results to change.

Mary Lou is pushing her younger brother, Steve, in his toy car. Steve gets out of the car. Steve's friend, who has more mass than he does, gets into the car. If Mary Lou wants to make the car go the same distance that it did when she pushed Steve, wh
a) Push the car with less force.
b) Push the car with more force.
c) Push the car with the same amount of force.
d) Add more mass to the car and push it with the same amount of force.

A rock is balanced on the side of a hill. Although the rock is heavy, a gentle push moves it. How can a small force cause a large mass to move?
a) The direction of the force is important to make an object move, but the amount of force is not.
b) The push on the rock increased the amount of friction, so the rock moved.
c) The small push balanced the forces that were keeping the rock in place and caused it to move.
d) The forces on the rock were balanced, and a small additional force caused them to be unbalanced.

Cayla likes to play many types of sports. During the course of a week, she goes bowling and plays soccer, baseball, and volleyball. Jane thinks the bowling ball requires the most force to move. Why would it require the most force?
a) It has the most mass.
b) She has to throw it indoors.
c) She has to hold it in her hand.
d) It is all black and the other balls have white on them.

The amount of friction exerted when an object moves across a surface depends on how the object and the surface rub together. For which of these surfaces will friction be greatest when a block of wood slides across it?
a) wet ice
b) glass mirror
c) thick carpet
d) waxed wood

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