If a 225N force is needed to lift a box 2m high, how much force is needed if a 3m ramp is used?
75N
150N
337.5N
112.5
A wrench is used to tighten a nut. A 12N force is applied 7.0cm from the axis of of rotation. What is the torque due to the applied force?
0.58Nm
0.84Nm
1.71Nm
14Nm
A 3.0-kg ball and a 1.0-kg ball are placed at opposite ends of a massless beam so that the system is in equilibrium as shown. Note: The drawing is not drawn to scale. What is the ratio of the lengths, b/a?
2.0
3.0
4.0
5.0
Pick out the instrument which uses gears from the following .
Scissors
Screw driver
Forceps
Hand-drill
An automotive engineer realizes it will be difficult for drivers to turn a pick up truck with a steering wheel that has a radius of only 11.0 cm . What can the engineer do to increase the mechanical advantage of the steering wheel?
shorten the axle length of the steering wheel
decrease the radius of the steering wheel
lengthen the axle length of steering wheel
increase the radius of the steering wheel
The distance from (a) to (b) is 20cm, the distance (a) to (c) is 80cm, the mass at (b) is 1kg. What mass would have the block at (c)?
250gm
400gm
1000gm
600gm
We do not use a number of gears in a ______________.
printing press
computer
clocks
motor cycle
The mechanical advantage of a compound machine is determined by __________________.
adding the mechanical advantage for each simple machine
finding the simple machine with the largest mechanical advantage
finding the average mechanical advantage for the simple machines
multiplying the mechanical advantage for each simple machine
A force of 60N rotates a body in the clockwise direction. The arm of the body is 1.5m. What is the moment of the force?
40Nm
90N
90Nm
40N
The moment of a force is the product of force and _____________.
perpendicular distance
acceleration due gravity
velocity
weight
