GROWTH DEVELOPMENT CHILD
FORMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is being acted on by an unbalanced force?
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book at rest on a library shelf
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tennis ball traveling at a constant velocity
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toy car rolling to a stop at the bottom of a ramp
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baseball sitting on the ground
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Explanation:
Detailed explanation-1: -When a car is on a ramp, a component or part of the force of gravity acts parallel to the ramp, causing the car to speed up, or accelerate down the ramp. This acceleration is not as great as when the car falls straight down since part of the gravitational force is also holding the car against the ramp.
Detailed explanation-2: -Friction, Gravity and Reaction of ground work on a toy car moving on ground.
Detailed explanation-3: -Weight affects speed down the ramp (the pull of gravity), but it’s the mass (and friction) that affects speed after a car leaves the ramp. Heavier cars have more momentum, so they travel further, given the same amount of friction.
There is 1 question to complete.