1) Explain why a car with a greater mass would need brakes that can exert a
greater braking force in order to operate safely.
A heavier object has higher momentum and higher kinetic energy, which are both
dependent on
...
1) Explain why a car with a greater mass would need brakes that can exert a
greater braking force in order to operate safely.
A heavier object has higher momentum and higher kinetic energy, which are both
dependent on the mass of a moving object. In order to reduce the speed of a moving object
energy is required. The energy required is the sum of its kinetic energy, potential energy and
momentum energy.
2) In order to move some heavy machinery onto a stage, Kevin sets up a ramp.
The ramp allows him to move a 510 N piece of sound-equipment with a force of
165 N. What is the mechanical advantage of the ramp Kevin set up?
A 1.0
B 4.5
C 0.32
D 3.1
3) Joshua is pushing a set piece for the school play onto the stage. If he applies a
95 N force for a period of 1.3 seconds, how much will the set piece's momentum
change during that period?
A 440 kg*m/s
B 73 kg*m/s
C 54 kg*m/s
D 120 kg*m/s
4)Two skydivers are in free fall. One skydiver is moving towards the other. When
they collide, they link arms, and travel downward as a single unit. Why type of
collision is this?
A Recoil collision
B Elastic collision
C This is not a collision
D Inelastic collision
5) A 72 kg runner is traveling south at a speed of 5.1 m/s. What is the runner's
momentum?
A 310 kg*m/s
B 26 kg*m/s
C 14 kg*m/s
D 370 kg*m/s
6) Clementine is spinning a merry-go-round. When she pulls on the handle, her
force is perpendicular to the radius of the ride. If she pulls with a force of 44 N,
and the radius of the merry-go-round is 1.7 m, how much torque did Clementine
exert on the ride?
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