LONG QUIZ NUMBER

Long Quiz Number

Long Quiz Number

1. A tractor pulls a loaded wagon with a constant force of 440N. If the total mass of the wagon and its contents is 275kg, what is the wagon's acceleration? (Ignore any frictional forces). What if the masses of the wagon and the contents had been given separately the first mass is 75kg and the second mass is 200kg, the frictional force is 140N, what will be the acceleration of the wagon? If the wagon starts from rest, how far it travelled in 4.00s?

Ax= Fp/M

= 440N/275KG

= 1.6m/s2

= 140N/75 KG

=1.86m/s2

=140N/200KG

=0.7m/s2

2. A student weighs 588N. What is her mass?

= 588/9.8 = 60 kg

3. Two blocks with masses, 2.5kg and 3.5kg, rest on a frictionless surface and are connected by a light string. A horizontal force of 12N is applied to the first mass. (a) what is the magnitude of the acceleration of the masses? (b)What is the magnitude of the force in the string?

= 1.2 m/s2

= same

4. A block of mass 0.50kg travels with a speed of 2m/s in the x-direction on a flat, frictionless surface. On passing through the origin, it experiences a constant force of 3N at an angle of 60 degrees relative to the x-axis for 1.5s. What is the velocity of the block at the end of this time?

The x-acting component of the constant 3 N force is 3 cos 60 = 1.5 NThe IMPULSE of this x-acting component = (1.5)(1.5) = 2.25 N-sThe momentum of the block as it enters the origin = (0.50)(2) = 1 kg-m/sThe final momentum (after the 3 N force acts for 1.5 s) is EITHER:

1) 1 + 2.25 = 3.25 kg-m/s => velocity of block = 3.25/0.50 = 6.5 m/s {+X direction}2) 1 - 2.25 = -1.25 kg-m/s => block velocity = 1.25/0.50 = ...