Physics 1010 Exam Study questions |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
and answers |||\\\
A motorcycle and a semi-truck are at rest.
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Which vehicle has greater momentum? - correct answer✔✔They have the same momentum.
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A motorcycle and a semi-truck travel have the same momentum.
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Which vehicle has a greater speed? - correct answer✔✔The motorcycle
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A bird with a mass of 496 grams is flying at a speed of 4 m/s. What is its momentum in kg m/s
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? - correct answer✔✔1.984
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How would you determine the impulse of a rocket engine acting on a rocket? - correct
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answer✔✔By measuring the average force of the engine and the time of its action. |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
A hockey puck is struck with a hockey stick. The time of contact is 2.41 ms.
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The impulse of the strike is 7.73 N*s.
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What is the average force (in Newtons) of the hockey stick hitting the puck? - correct
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answer✔✔3,208
A person drops two equal lumps of clay from the same height above the floor.
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The first lump lands on the hard concrete floor and comes to a rest.
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The second lump lands on a foam pad and comes to a rest.
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Which lump experiences greater impulse when hitting the floor?
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hint: both objects experience the same change in momentum - correct answer✔✔They both
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experience the same impulse. |||\\\ |||\\\ |||\\\
, A person drops two equal lumps of clay from the same height above the floor.
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The first lump lands on the hard concrete floor and comes to a rest.
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The second lump lands on a foam pad and comes to a rest.
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Which lump experiences greater force when hitting the floor? - correct answer✔✔The first
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lump experiences greater force. |||\\\ |||\\\ |||\\\
Modern automobile bodies are designed so that the front of the car is made of a weaker metal
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structure than the interior. Would this make the car more or less safe during a collision? -
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correct answer✔✔The weaker front structure would cause the car to stop in a longer time
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during a crash and be more safe during a collision.
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A rubber ball with a mass of 1.0 kg falls and hits the ground with a speed of 4.0 m/s.
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It rebounds with a speed of 3.0 m/s.
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What is the impulse acting on the ball when it hits the ground? - correct answer✔✔7.0 kg m/s
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A bouncy rubber ball and a soft lump of clay have the same mass.
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Both objects are thrown against the wall with the same speed.
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Which object will experience the greatest impulse when hitting the wall? - correct
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answer✔✔The ball |||\\\
What are the conditions for conservation of momentum in a system? - correct answer✔✔No
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net external force can act on the system.
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Two students are sitting at rest on frictionless carts. Student 1 has a mass of 55 kg and student
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2 has a mass of 74 kg. They push off against each other.
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Student 1 moves away with a speed of 1 m/s. What is the speed (in m/s) at which student 2
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moves away? - correct answer✔✔ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
and answers |||\\\
A motorcycle and a semi-truck are at rest.
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Which vehicle has greater momentum? - correct answer✔✔They have the same momentum.
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A motorcycle and a semi-truck travel have the same momentum.
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Which vehicle has a greater speed? - correct answer✔✔The motorcycle
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A bird with a mass of 496 grams is flying at a speed of 4 m/s. What is its momentum in kg m/s
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? - correct answer✔✔1.984
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How would you determine the impulse of a rocket engine acting on a rocket? - correct
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answer✔✔By measuring the average force of the engine and the time of its action. |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
A hockey puck is struck with a hockey stick. The time of contact is 2.41 ms.
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The impulse of the strike is 7.73 N*s.
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What is the average force (in Newtons) of the hockey stick hitting the puck? - correct
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answer✔✔3,208
A person drops two equal lumps of clay from the same height above the floor.
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The first lump lands on the hard concrete floor and comes to a rest.
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The second lump lands on a foam pad and comes to a rest.
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Which lump experiences greater impulse when hitting the floor?
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hint: both objects experience the same change in momentum - correct answer✔✔They both
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experience the same impulse. |||\\\ |||\\\ |||\\\
, A person drops two equal lumps of clay from the same height above the floor.
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The first lump lands on the hard concrete floor and comes to a rest.
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The second lump lands on a foam pad and comes to a rest.
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Which lump experiences greater force when hitting the floor? - correct answer✔✔The first
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lump experiences greater force. |||\\\ |||\\\ |||\\\
Modern automobile bodies are designed so that the front of the car is made of a weaker metal
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structure than the interior. Would this make the car more or less safe during a collision? -
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correct answer✔✔The weaker front structure would cause the car to stop in a longer time
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during a crash and be more safe during a collision.
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A rubber ball with a mass of 1.0 kg falls and hits the ground with a speed of 4.0 m/s.
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It rebounds with a speed of 3.0 m/s.
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What is the impulse acting on the ball when it hits the ground? - correct answer✔✔7.0 kg m/s
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A bouncy rubber ball and a soft lump of clay have the same mass.
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Both objects are thrown against the wall with the same speed.
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Which object will experience the greatest impulse when hitting the wall? - correct
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answer✔✔The ball |||\\\
What are the conditions for conservation of momentum in a system? - correct answer✔✔No
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net external force can act on the system.
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Two students are sitting at rest on frictionless carts. Student 1 has a mass of 55 kg and student
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2 has a mass of 74 kg. They push off against each other.
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Student 1 moves away with a speed of 1 m/s. What is the speed (in m/s) at which student 2
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moves away? - correct answer✔✔ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
