What type of motion could line C represent - a bird landing in sand, a car accelerating away, a car coming to a sudden stop, or a horse slowing from a trot to a walk?
a car accelerating away
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trap
No points!
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fairy
Take points!
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rocket
Go to first place!
Okay!
baam
Lose 25 points!
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boom
Lose 50 points!
Oops!
star
Double points!
Okay!
gift
Win 25 points!
Okay!
lifesaver
Give 25 points!
Oops!
boom
Lose 50 points!
Oops!
fairy
Take points!
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gift
Win 25 points!
Okay!
baam
Lose 10 points!
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15
When a meteor gets near the Earth, it curves toward the Earth. Why doesn't the Earth curve toward the meteor?
Though they are both exerting equal gravitational forces on each other, the Earth is much more massive, and thus does not move.
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15
A hovercraft uses blowers to force air underneath it, allowing it to coast on a thin layer of air. What type of force is it reducing?
Friction
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15
Two unequal forces are exerted in opposite directions on an object. Will the object accelerate?
Yes - the forces are unbalanced so the object will move in the direction of the stronger force.
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15
Why is the front of a car designed to crumple during a crash?
It increases the amount of time it takes for the crash to happen, which decreases the acceleration, which decreases the amount of force from the impact.
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15
A frog jumps off of a lily pad, which is in the water, onto a rock. Which will move - the lily pad, the rock, or both, and in which direction?
The lily pad will move away from the rock.
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15
TRUE or FALSE: When a baseball is hit by a baseball bat, they exert equal and opposite forces on one another, which cancel each other out for a net force of 0.
FALSE: The forces are exerted on two different objects, so although there are equal and opposite forces applied, the effects do not cancel each other out.
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15
Amber hikes 10 miles East then 5 miles West. The trip takes her 5 hours. What is her speed?
3 miles per hour
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15
Amber hikes 10 miles East then 5 miles West. The trip takes her 5 hours. What is her displacement?
5 miles East
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trap
No points!
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star
Double points!
Okay!
shark
Other team loses 20 points!
Okay!
thief
Give points!
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15
If a hovercraft is moving with an acceleration of 6 m/s2 and a 52 kg person is onboard, how much force is being applied?
312 N
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15
Object A and B both have a mass of 50 kg. If object A accelerates slower than object B, on which object was more force applied?
Object B
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15
Based on the pictures of spring scales shown here, which object (A, B, C, or D) has the least weight?
