Unit 4 Force and Motion Review

Write T for true and F for false.

___1. All the forces are balanced on an object maintaining a constant speed.

___2. When a book sits still on a table the forces acting on it are unbalanced.

___3. Velocity and Speed are the same.

___4. Acceleration is the change in velocity over time.

___5. If a car maintains its speed, but changes its direction it has changed its velocity.

Fill in the blank.

  1. Velocity is speed and ______.
  2. When the forces acting on an object are in opposite directions, you should ______to calculate the net force.
  3. When the forces acting on an object are in the same direction, you should ______to calculate the net force.
  4. A car going around a curve in the road is an example of ______.
  5. A neutral atom with an atomic number of 16 has ______valence electrons.

Short Answer

  1. What will happen to a car traveling at a constant speed of 70mph if no additional forces act on it?
  1. List the signs of a chemical reaction.
  1. Which two elements are in the same group? Which two are in the same period?

Ne, Mg, Xe, K, Au, Se

  1. Below is a table of data taken from an experiment.

Release location / Average Velocity (cm/s down)
40 cm / 72.3
80 cm / 122.6
100 cm / 235.8

Describe what happened to the velocity of the car during the experiment.

Calculate the following:

  1. Bruce Wayne pushes a shopping cart with a force of 20N. The joker pushes back with a force of 22N. What is the net force on the cart?
  1. How much force does it take to stop a 2.0 kg ball traveling 3.0m/s2?
  1. Two wagons hooked together are traveling at 1.5m/s2. If each cart is 3kg, what is the force required to stop them?
  1. A student tries to take a book away from another student who also pulls on the book trying to get it back. What is the net force applied to the book if neither student can successfully take the book from the other?
  1. Lois is pushing on a door with a force of 35N. Clark comes to help her and pushes alongside her with a force of 85N. What is the net force applied to the door?
  1. Oliver Queen shoots an arrow with a mass of .8 kg. It travels at 32m/s2. It misses Merlyn and strikes a signpost with what force?
  1. A car has a mass of 1600 kg. Another car has a mass of 1100 kg. If the same amount of force is applied to both, which car will accelerate faster?
  1. How many phosphorus atoms in the formula H3PO4?
  1. Put an S, V, or A to indicate whether the following are examples of speed, velocity, or acceleration.

___ a. a car navigates a curve in the road

___b. the drive to Stark Enterprises is 30 miles. Tony takes 20 min to get there.

___ c. driving 30mph on Lang road toward HEB

___ d. a car leaving a stop sign

___e. a plane flying south at 200 mph.

___f. A runner runs a mile in 3.78 min.