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Energy - Physics
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Gravity
Terms in this set (20)
What is correct about work
A force that has a component acting in the direction of motion does work
Balls A and B roll down frictionless surfaces. Their vertical and horizontal displacements are equal. Which principles could be used to calculate the speed of each ball at the bottom?
constant acceleration equations and conservation of energy
Bill used a truck full of marbles crashing into a wall to explain
conservation of momentum
During a game billiards , which of the following forces will prevent momentum from being conserved
friction between the balls and table cloth, friction between balls during impact, the reaction force of side cushions
A mass oscillates on a spring between positions A and B on a compressible string. At point A the spring is fully compressed and at B the spring is extended. The spring is shown at equilibrium. At position A
Ee - max, Ek = min, Eg = max
During an inelastic collision
momentum is conserved but kinetic energy is not
The ball is moving to the right with a momentum of 10kg(m/s) rebounds with momentum of 8kg(m/s) to the left. The change in momentum is
18kg(m/s) L
A hand grenade explodes into 3 pieces as it travels through the air. Neglecting air resistance,
the components perpendicular to the original direction of the grenade must add up to zero
Assuming no air resistance, during a bungee jump the total mechanical energy is
constant
A figure skater finishes her routine spinning slowly and then faster and faster. She does this by:
bringing in arms to her body to decrease her moment of inertia
Modern golfers are able to hit the ball further than was possible with older wood gold clubs because of:
modern clubs give more contact time between ball and club
Which statement about conservation of energy and momentum are correct
both are conserved during an collision in a closed system
Two objects undergo a head on inelastic collision. The objects have masses m1=2kg and m2=5kg. The velocities before the collision are v1=7m/s and v2=-2m/s
the masses will move to the right after the collision
A diver leaves the board by applying a force directly through her centre of gravity. She will
never rotate
The shaded area under a F(N) and t(s) graph represents
change in momentum during an elastic collision
While an athlete is airborne
angular momentum must remain constant
During a bungee jump _____ energy increases as the cord begins to stretch
elastic potential
In the equation Ee = 1/2kx^2 the k value represents
spring constant
The follow through in sports is used to
increase time interval with increased force to yield a higher velocity
Pylometric training is dangerous because it produces
force based impulse
;