WorksheetsNewton's 2nd and 3rd Laws
Total questions: 10
Worksheet time: 5mins
A girl exerts a 36 N horizontal force as she pulls a 52 N sled across the cement sidewalk at a constant speed. What is the coefficient of kinetic friction between the sidewalk and the metal sled runners? Ignore air resistance.
0.69
0.31
0.44
0.52
You need to move a 105 kg sofa to a different location in the room. It takes a force of 102 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?
0.1
0.2
0.3
0.5
Mr. Ames is dragging a box full of books from his office to his car. The box and books together have a combined weight of 134 N. If the coefficient of static friction between the pavement and the box is 0.55, with what magnitude of force must Mr. Ames push the box in order to start it moving?
About 74N
About 90N
About 134N
About 20N
The force of gravity pulls down on you. Newton's 3rd Law implies that...
you pull upward on the Earth
the chair pushes back
you fall to the ground
there is a normal force
A 70kg person and a 65kg person play tug-of-war with a massless rope on a frictionless surface. If the acceleration of the 70kg person is 4.1m/s^2, what is the magnitude of the acceleration of the 65kg person?
4.42m/s^2
4.1m/s^2
5.2m/s^2
3.8m/s^2
A rifle recoils when fired. The bullet pushes backward on the rifle. The force on the recoiling rifle is…
greater than the force on the bullet
less than the force on the bullet
the same magnitude as the force on the bullet
A rifle recoils when fired. The bullet pushes backwards upon the rifle. The acceleration of the recoiling rifle is…
greater than the acceleration of the bullet that it fires
less than the acceleration of the bullet that it fires
the same magnitude as the acceleration of the bullet that it fires
A 5g leaf falls to the ground. As it falls, what force does it exert on the Earth?
0.049N upward
49N upward
0.000049N upward
4900N upward
Pratish weighs 588N but feels weightless in the ISS. If she pushes off the wall with an acceleration of 3m/s^2 leftward, determine the force exerted by the wall during her push.
180N leftward
180N rightward
1764N leftward
1764N rightward
An air-hockey table works by pumping air through thousands of tiny holes in a table to support light pucks. This allows the pucks to move around on cushions of air with very little resistance. One of these pucks has a mass of 0.25kg and is pushed along by a 12.0N force for 9 seconds. What is the puck's final speed (assuming is starts at rest)?
432m/s
27m/s
108m/s
2.25m/s
