If the object in the image is in a state of static equilibrium, which of the following represents the missing force vector?
None of the above
A train is travelling to the right at a constant acceleration of 20 m/s2. What is true about the net force on the train?
Fnetx= 0, Fnety= 0
Fnetx is to the right, Fnety=0
Fnetx =0, Fnety is downwards
Fnetx is to the right, Fnety is downwards
There is no net force on the train
Which of the following situations describes an object in mechanical equilibrium?
A rock sitting in the middle of the road.
A rocket ship accelerating at a constant rate.
A skydiver in free fall.
A sailboat sailing at a constant velocity.
A ball hanging at the end of a string.
A 20 kg wagon is pulled with a tension force of 40 N at a constant velocity. What is the magnitude of the kinetic force of friction? Answer to the nearest whole number and include units.
True or False?
Even though Object A is smaller, it will exert a force of the same magnitude back on Object B.
An 2 kg object experiences a force of 5 N, and accelerates at 2.5 m/s2. What force must be applied to a 6 kg object so that it will experience the same acceleration?
A soccer ball is kicked by the foot of a soccer player during a game. If the soccer ball is the system, which of the following forces act upon it?
The force of the soccer ball on the foot.
The force of the Earth on the soccer ball.
The force of the Earth on the soccer player.
The force of the soccer ball on the Earth.
Which of Newton's Laws of motion states:
ΣF = ma?
Newton's First Law of Motion
Newton's Second Law of Motion
Newton's Third Law of Motion
Which of the following images shows a box accelerating down a hill?
A seal with a mass of 60kg slides along frictionless ice at a constant velocity of 1.75. It then reaches a rough patch of ice, which exerts a frictional force of 6 N. How long does it take the penguin to come to a rest?
Answer to one decimal place, and include units.