Quiz Standard 7 Answer Key
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- Explanation: The mechanical advantage of the lever would be 4.
- Explanation
- Explanation: They walked in one direction, then they were still, then they walked in the opposite direction.
- Explanation: The car travels at a constant velocity.
- Explanation: 75
Explanation: The mechanical advantage of the lever would be 4. To solve you would divide the resistance force by the effort force or
. 23) A bicycle rider sees a car up ahead, and slows down to avoid a collision. He starts off traveling at 15
and slows down to 5
in 7.5 s. Find the acceleration of the bike rider.
Explanation: To determine the acceleration, plug the appropriate values into the equation a =
, where vf =
, vi = 15
and t = 7.5s. This gives a =
= -1.33
24) 
John and Caroline go out for a walk one day. This graph represents their distance from home. Which statement accurately describes their walk?
Explanation:_They_walked_in_one_direction,_then_they_were_still,_then_they_walked_in_the_opposite_direction.'>Explanation: They walked in one direction, then they were still, then they walked in the opposite direction. During the first part of the trip, they travel 30 km in 0.75 hours at a constant rate. Then, they are still for 1 hour. Finally, they travel 30 km in 0.75 hours, but in the opposite direction. 25) 
The graph represents the distance a car travels over time while on the highway. Which statement about the car's trip is accurate?
Explanation: The car travels at a constant velocity. This can be determined because the distance and time are constantly changing. And, the slope of the graph remains the same over time. 26)
The graph represents the distance a car travels over time while on the highway. What is the average velocity of the car?
Explanation: 75
The easiest place to determine this is the two points (0,0) and (4,300). Over 4 seconds, the distance goes from 0 to 300 km. V =
=
. 27) What is the relationship between the weight of a cellphone and its mass (0.26 kg)?
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