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Questions and Answers
What is the time taken to slide down the ways of a ship that is 900m long, given it takes 4 seconds to slide the first meter?
What is the time taken to slide down the ways of a ship that is 900m long, given it takes 4 seconds to slide the first meter?
- 2 min (correct)
- 5 min
- 3 min
- 1 min
If a driver travels at 50mph and begins to brake with a deceleration of 6m/s², what distance does the car cover during the driver's perception time of 3 seconds?
If a driver travels at 50mph and begins to brake with a deceleration of 6m/s², what distance does the car cover during the driver's perception time of 3 seconds?
- 35.5m
- 150.0m
- 65.0m
- 120.74m (correct)
What is the maximum height above the ground that a ball reaches when thrown straight up at 10m/s from a height of 2m?
What is the maximum height above the ground that a ball reaches when thrown straight up at 10m/s from a height of 2m?
- 5.1m
- 10.5m
- 7.1m (correct)
- 9.0m
How long does it take for a ball thrown straight up at 10m/s to hit the ground if it starts from a height of 2m?
How long does it take for a ball thrown straight up at 10m/s to hit the ground if it starts from a height of 2m?
During freefall, what determines the maximum speed an object can reach before colliding with the ground?
During freefall, what determines the maximum speed an object can reach before colliding with the ground?
If a vehicle is decelerating at 6m/s², how long will it take to come to a stop from a speed of 50mph?
If a vehicle is decelerating at 6m/s², how long will it take to come to a stop from a speed of 50mph?
What is the magnitude of the velocity just before a ball hits the ground after being thrown up at 10m/s?
What is the magnitude of the velocity just before a ball hits the ground after being thrown up at 10m/s?
What factors can affect the speed of an object in free fall?
What factors can affect the speed of an object in free fall?
Study Notes
Dynamics of Rigid Bodies
- A ship slides down a ramp with constant acceleration.
- The ship takes 4 seconds to slide the first meter.
- The length of the ramp is 900 meters.
- It takes 2 minutes for the ship to slide the entire length of the ramp.
Free Falling Body
- Freefall is a common phenomenon where an object falls under gravity.
- The object's speed increases as it falls.
- Many factors, such as air resistance, can affect the speed of the object.
Example of Freefall
- A ball is thrown straight up at a speed of 10m/s.
- The ball is released 2 meters above the ground.
- The maximum height reached by the ball is 7.1 meters.
- The ball hits the ground 2.22 seconds after being released.
- The ball's velocity just before hitting the ground is 11.8m/s.
Another Example
- A car traveling at 50mph sees a wall.
- The driver takes 3 seconds to react (perception time).
- The car then brakes at a rate of 6m/sec².
- The distance from the stopping point to the wall is 12m.
- The car was 120.74 meters away from the wall when the driver first perceived it.
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Description
Explore the principles of dynamics concerning rigid bodies and the laws governing free fall. This quiz covers scenarios involving a ship sliding down a ramp and various examples of free fall, including the motion of a ball and a car's stopping distance. Test your understanding of acceleration, gravity, and kinematic equations.
