Physics exam chapter 2
A pair of 10-N vectors at right angles to each other has a resultant of about
14 N.
When a pair of 10-N forces act on a box of candy, the net force on the box is
Any of the above depending on the directions of forces.
The first scientist to introduce the concept of inertia was
Galileo.
A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is
about 30 m/s.
The support force on a 30-kg dog sleeping on the floor is
about 300 N.
If Nellie hangs from a horizontal bar that is supported by four vertical ropes, the tension in the ropes
add to equal her weight.
If you toss a coin straight upward while in a train moving at constant velocity, the coin will land
as if you were at rest.
If Burl carries Paul piggy-back while standing in the middle of a scaffold, the tensions in the two supporting ropes would
be equal.
Suspend your body from a pair of ropes slightly angled from the vertical and the tension in each rope will be
greater than half your weight.
When Nellie Newton hangs by the ends of a rope draped over a large pulley, the tension in each supporting vertical strand is
half her weight
Suspend your body from a pair of vertical ropes and the tension in each rope will be
half your weight.
Galileo taught us that if you roll a ball along a level surface it will
keep rolling if friction is absent.
A force is a vector quantity because it has both
magnitude and direction.
A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is
none of the above
Which of the following is a vector quantity?
none of the above
Galileo's interpretation of motion differed from Aristotle's in that Galileo emphasized
rates of time.
When Nellie Newton hangs at rest in the middle of a clothesline, the tension will not be the same in each side of the rope when
the angles at each side of the rope are unequal.
Burl and Paul paint signs together on a scaffold. Compared to their weights plus the weight of the scaffold, the sum of tensions in the supporting ropes is
the same.
The net force acting on an insect falling downward at constant velocity is
zero
Nellie pulls with a force of 50 N on a horizontal rope tied to a tree at rest. The net force on the rope is
zero and rope tension is 50 N.
