Net Force Worksheet #5 G12-2

Name: Grade and Section: Balanced and Unbalanced Forces-Explanation and Real-Life Examples Net Force Physics Problems, Frictional Force, Acceleration, Newton's Laws of Motion, The Meaning of Force Additional Material (Click the paragraph below) Sort the pictures as either balanced forces or unbalanced forces. Unbalanced Forces Balanced Forces _ is a push or a pull on an object. Friction Force Gravity Inertia What is the unit to measure force? meter kilogram Newton milliliter If these teams are pulling with the same amount of force what will happen? The team with the green and orange shirts will win. The team with the yellow and red shirts will win. They will not move and neither team will win. Which could be an example of a unbalanced force? A plate sitting on a dining table A ball at the top of a hill that is not moving A baseball that is hit with a bat. A car that is traveling down a straight road at a constant speed. How will this object move? to the left to the right up it won't move How will this object move? to the left to the right up it won't move Forces that cause a change in the motion of an object are - always balanced always unbalanced always a pushing force always a pulling force The force that pulls downward on all objects is known as - air resistance friction gravity equilibrium Franklin lifts a 2.00 kg box vertically. If he lifts it so that way the velocity of the box is constant, how much force is he using? (g=−9.80 m 4.90 N 7.82 N 19.6 N 39.2 N In the district finals, Vanessa kicks the 0.600 kg soccer ball with a force of 80.0 N. How much does she accelerate the ball? 48 m 60 m 122 m 133 m When an unbalanced force is applied to an object that is already moving, which of the following can occur? the object may slow down the object may speed up the object may change direction all of the above Which force acts in the opposite direction of a car's tire rolling across a flat road? friction gravity inertia equilibrium When forces are BALANCED, the net force is _. Zero To the right To the left Downward A big tractor pulls a box with a force of 400N to the left. A small tractor pulls that same box with a force of 200N to the right. What is the net force on the box and what direction will it move? The net force is 600 N and the box will not move. The net force is 600 N and the box will move to the left The net force is 200 N and the box will move to the left. The net force is 200 N and the box will move to the right Problem Solving Example:Michael pushes a 2 kg box with 30 N of force to the left. Annie pushes the same box with 40 N of force to the right. What is the net force on the box? 10 N Jerry pushes a 3.20 kg box with 1.50 N of force. What is the resultant acceleration? 0.470 m A 1.12 kg ball rolls forward with a net acceleration of 1.11 m What is the net force on the ball? 1.24 N Louisa rolls a ball with 31.0 N of force. She observes that it has a constant linear acceleration of 2.10 m What is the mass of the ball? 14.8 kg Franklin lifts a 2.00 kg weight vertically. If he lifts it so that way the velocity of the weight is constant, how much force is he using? 19.6 N A 12.0 kg box starts at rest and reaches a velocity of 3.45 m after traveling a distance 12.0 m. What was the force on the box? 5.95 N The force acting upon a crate is 6.22 N. If the mass of the crate is 4.62 kg, what is the acceleration? 1.35 m An object with a force of 13.4 N on it is accelerating at 11.8 m What is the mass of the object? 1.14 kg An object with a mass of 10.4 kg experiences a force of 19.2 N. What is the acceleration of the object? 1.85 m What is the mass of an object being pushed with a net force of 10.0 N at 1.50 m 6.67 kg What is the net force needed to accelerate a 66.0 kg skier at 2.00 m 132 N