A force of 1 N is the approximate force needed to lift ....
a sugar cube
a car
a truck
an apple
What law is described by:
"An object continues to remain in a state of rest or uniform motion unless an unbalanced force acts on it"
Newton's second law
Newton's third law
Newton's first law
What is another name for Newton's first law of motion?
Law of inertia
Law of momentum
Law of infinite motion
Law of friction
A 2 000 kg car is sitting at rest in a parking lot.
A bike and rider with a total mass of 60 kg are traveling along a road at 10 km.h-1.
Which system has more inertia? Why?
The car has more inertia, as its mass is less than the mass of the bike.
The car has more inertia, as its mass is greater than the mass of the bike.
The bike has more inertia, as its mass is less than the mass of the car.
The bike has more inertia, as its speed is faster than the car.
What is the net external force on an object in free-fall on Earth if you were to ignore the effect of air?
The net force is upward with magnitude mg
The net force is downward with magnitude mg
The net force is zero
The net force is downward with magnitude 9,8 N
One object exerts a force of magnitude F1 on another object and experiences a force of magnitude F2 in return. What is true for F1 and F2?
F1 > F2
F1 < F2
F1 = F2
Two objects rest on a uniform surface. A person pushes both with equal force. If the first object starts to move faster than the second, what can be said about their masses?
The mass of the first object is equal to the mass of the second object.
No inference can be made because mass and force are not related to each other.
The mass of the first object is less than that of the second object.
The mass of the first object is greater than that of the second object.
A 55 kg woman stands on a bathroom scale inside an elevator. The scale reads 600 N. What do you know about the motion of the elevator?
The elevator must be accelerating upward.
The elevator must be accelerating downward.
The elevator must be moving upward with a constant velocity.
The elevator must be moving downward with a constant velocity.
If a lift is moving upwards but experiences a downwards acceleration we can say that it is
speeding up
slowing down
When an object rests on an inclined plane that makes an angle θ with the horizontal, what is the expression for the component of the object's weight force that is parallel to the incline?
F// = Fg cos 𝜃
F// = Fg sin 𝜃
If an object moves with a constant velocity, we can conclude that
there are no forces acting on it.
there is no unbalanced (net) force acting on it.
it is moving toward its natural place.
it has a very large inertia.
A block rests on an inclined rough surface that makes an angle θ with the horizontal. The block remains at rest at θ is slowly increased. Which is the best description of how the magnitudes of the normal force and static frictional force of the rough surface on the block change as θ is slowly increased?
increases
decreases
remains the same
Normal force
Static frictional force
When a force of F acts on an object of mass m, it experiences an acceleration a. If the force is doubled and the mass of the object is halved, what is the new a?