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A ball of mass 0.4 kg is initially at rest on the ground. It is kicked and leaves the kicker's
foot with a speed of 5.0 m/s in a direction 60° above the horizontal. The magnitude of
the impulse imparted by the ball to the foot is most nearly
2 N*s
A force of constant magnitude F and fixed direction acts on an object of mass m that is
initially at rest. If the force acts for a time interval ∆t over a displacement ∆x , what is the
magnitude of the resultant change in the linear momentum of the object?
FΔt
A person applies an impulse of 5.0 kg∙m/s to a box in order to set it in motion. If the
person is in contact with the box for 0.25 s, what is the average force exerted by the
person on the box?
20.0N
An object of known mass M with speed vo travels toward a wall. The object collides with
it and bounces away from the wall in the opposite direction in which the object was
initially traveling. The wall exerts an average force Fo on the object during the collision.
A student must use the equation \Delta p=F\Delta tΔp=FΔt to determine the change in
momentum of the object from immediately before the collision to immediately after the
collision. Which side of the equation could the student use to determine the change of
the object's momentum?
Neither side of the equation may be used because there are too many unknown
quantities before, during, and after the collision.
In an experiment, an object is released from rest near and above Earth's surface. A
student must determine the relationship between the direction of the gravitational force
exerted on the object and the change in momentum caused by that force. What data
could the student collect to determine the magnitude and direction of the gravitational
force and the change in momentum of the object? Justify your choices. Select two
answers.
The mass of the object, because it is required to determine the force due to gravity
exerted on the object, and the velocity of the object the instant before it reaches Earth's
surface, because it is required to determine the change in velocity of the object.
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