1D motion
What is the difference between speed and velocity?
Speed represents the total distance covered, while velocity represents the change in position
Which of the following measurements is NOT a Scalar?
A. Time
B. Speed
C. Distance
D. Displacement
Displacement
A stunt person jumps from the roof of a tall building, but no injury occurs because the person lands on a large, air-filled bag. Which one of the following BEST describes why no injury occurs?
A. The bag provides the necessary force to stop the person.
B.The bag provides an impulse greater than the person's change in momentum by decreasing the time of impact.
C.The bag provides an impulse equal to the person's change in momentum by increasing the time of impact.
The bag provides an impulse greater than the person's change in momentum by decreasing the time of impact.
What is another name for the first law of motion?
Law of inertia.
An 8 kg dog is running at 4 m/s. What is the kinetic energy of the dog?
64
What is the SI unit for acceleration?
m/s^2
Your high school player has thrown a ball horizontally down the football field. He needs to increase the time the ball is in the air to give the receiver an opportunity to get in the right position to catch the ball. Which factor will increase the flight time of the football?
Increasing the vertical height from which the ball is thrown
What is an object's change in momentum equal to?
the impulse acting on the object
In the absence of an external force, a moving object will
move at a constant velocity
What is the work done on a 45kg box that is being pushed with a 100N force for 5m?
500j
Displacement is a vector quantity because it includes information about:
Magnitude and direction
A plane traveling at a constant horizontal velocity drops a package. If the package experiences no air resistance, describe the path of the package in relation to the position of the plane.
The package will gradually fall behind the horizontal position of the plane as it falls through the air.
A large, moving truck crashes into a small parked car. How do the magnitudes of the impulses and the forces on each vehicle compare during the collision?
The truck experiences equal force and equal impulse
A man is whirling a 0.5 kg ball on a 1.0 m long string at 2 m/s. What is true about the force on the ball?
It pulls in, toward the center of the circle
what is a variable force?
any force that is not constant
How far will an object travel after ten seconds if it is dropped into a bottomless pit?
500m
An object is shot from the ground at 75m/s at an angle of 45⁰ above the horizontal. How high does the object get before beginning its descent?
140m
When the momentum of an object doubles and its mass remains constant, its kinetic energy:
quadruples
Newton's first Law of Motion states that if there is no net force acting on an object it will:
remain at rest
In the absence of friction, how much energy would be lost as a rollercoaster car goes down the first of several 'hills'?
none of it is lost
What does the area under the velocity time graph represent
displacement
20 degrees north is a scalar or vector?
scalar
A baseball (1 kg) coming from the East is approaching Barry at 10 m/s. Barry hits the baseball back to where it came from and the baseball leaves his bat at 10 m/s. What is the impulse Barry delivered to the baseball?
20 N.s to the east
In the equation F = ma, what does m represent?
mass m
A heated pot of water exhibits what kind of energy?
Thermal energy