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5/40 MCQs for:

Dynamics: Newton’s Laws of Motion

A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 37.00 above the horizontal. If the mass of the box and the books is 40.0 kg, what is the normal force on the box?

332 N.

392 N.

312 N.

292 N.

A block of mass m slides down a frictionless plane inclined at an angle θ with the horizontal. The normal reaction force exerted by the plane on the block is:

mg.

Zero, since the plane is frictionless.

mgsinθ.

mgcosθ.

An object of mass m is hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the string?

Exactly mg.

Greater than mg.

Less than mg.

Zero.

A stone is thrown straight up. At the top of its path, the net force acting on it is:

Greater than zero, but less than its weight.

Instantaneously equal to zero.

Greater than its weight.

Equal to its weight.

When you sit on a chair, the resultant force on you is:

Down.

Up.

Depending on your weight.

Zero.