U7 Comp Quiz 2023
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Last updated 6 months ago
17 Nsɛmmisa
Hyɛ no nsow a efi ɔkyerɛwfo no hɔ:
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Select the type of collision in which momentum is conserved.
Select the type of collision in which kinetic energy is conserved.
Select the type of collision both objects always have the same final velocity.
What must all moving objects have?
A 4kg seagull flies at 18m/s and lands on a 9kg piece of stationary driftwood. What is the velocity of the seagull and driftwood together while they are moving?
Calculate the velocity of a tractor that is 3200kg and utilizes 4200 kgm/s of momentum?
What is the impulse experienced on a ball by a bat with 23N of force for 0.008 seconds?
An 86kg student is sitting on a high tech rolling chair whose wheels are so well manufactured that friction is almost non-existent. She has been challenged by her friends to move towards the white board without using her feet. The only thing she has is her 27kg backpack that she is able to throw at 6 m/s.
What will be her velocity after she throws the backpack?
Two students are conducting a Collisions Simulation in which the carts begin together. Consider this scenario after the carts are pushed away from each other.
Check all that apply.
As a 2,300kg truck speeds up from 46m/s to 68m/s, what is the impulse on the truck?
How much force is exerted on a skater when a 102kg hockey player misses a check and hits the boards at 12m/s taking 0.2 seconds to stop?
A student is sitting on a stationary cart that rolls with very little effort when a heavy backpack is thrown at the student, who then catches the backpack.
How did the velocity of the backpack change?
Match the scenario with the correct assumption.
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
A red cart collides with a purple cart which is at rest. The purple cart moves forward while the red moves backward. | arrow_right_alt | The mass of the red cart and the purple cart must be equal |
A red cart collides with a purple cart which is at rest. The purple cart moves forward while the red cart also moves forward, but at a slower speed than the purple cart. | arrow_right_alt | The mass of the purple cart must be greater than the mass of red cart |
A red cart collides with a purple cart which is at rest. The purple cart moves forward while the red cart comes to a complete stop. | arrow_right_alt | The mass of the red cart must be greater than the mass of purple cart |
Using the physics of motion, explain why seat belts are required by law.
A 0.08kg arrow is shot, without any arc in its trajectory, from a high force bow at a stationary 2.1kg hay target. The forces of the arrow embed it in the target and push them back at 4.1m/s. Assuming there is no friction, what is the initial speed of the arrow prior to hitting the target?
Weekly Check in: How was your week? Any celebrations? What concept did you struggle with? Any favorite songs with artist name?
What direction should she throw her backpack?