Unit 2A Force and Motion Study Guide

Unit 2a Force and Motion Study Guide

1. Label the following with the proper SI unit from these unit label choices :

km/h, mph, f/s, m/s, m/h, m/s2, g, kg, km, m, N, m/s North (or south, east or west)

Acceleration______Mass______Distance______Speed______

Velocity______Force______

1. True or False:

______You are traveling in a car at a constant speed of 50 km/hr and are turning through a curve in the road to the right. You and the vehicle are experiencing acceleration.

______You experience acceleration when you have a change in direction.

______A change in speed is not always a change in acceleration.

______Your velocity changes from 50 m/s West to 50 m/s Southwest. You have not experienced acceleration.

1. You are running on a moving walkway at 4 m/s east, which is the opposite direction of the moving walkway. The walkway is moving at 5 m/s. Your resultant velocity is

1. 1 m/s west
2. 9 m/s east
3. 1 m/s east
4. 9 m/s west

1. A truck is traveling 27 m/s south and speeds up to 30 m/s. Check all that apply.

____ this is a change in speed

____ this is a change in velocity

____ this is a change in acceleration

1. Acceleration occurs when a ______is applied to an object and this acceleration is in the ______direction as the applied ______.
2. When a roller coaster makes a sharp turn, you slide in the opposite direction of the turn because of ______.

1. Newton’s first law of motion states that

1. an object in motion remains in motion unless acted upon by an unbalanced force.
2. an object in motion eventually comes to a stop.
3. objects in motion accelerate in a vacuum
4. for every action, there is an equal and opposite reaction.

1. You are holding a 10 N medicine ball over your head.

1. the downward force on the ball is 10 N.
2. the upward force of your hands is 10 N.
3. the mass of the ball is 20 N.
4. this is an example of anunbalanced force.
5. both a and b.

1. Newton’s ______law of motion states that if a force is exerted on an object, another force occurs that is equal in size and opposite in direction.

1. Newton’s ______law of motion states that an object in ______tends to stay in ______and an object at ______tends to stay at ______unless acted upon by an unbalanced force.

1. A small car and a large truck are moving at equal velocities. Which of the following are true?

1. They are moving in the same direction.
2. The truck has greater inertia.
3. They are moving in opposite directions.
4. Both a and b.

1. ______is the tendency of an object to resist any change in its motion.

1. Force pairs (circle all that apply)

1. act on the same object.
2. do not act on the same object.
3. are always equal.
4. are always unequal.

1. A bowling ball, a ping pong ball, a baseball and a tennis ball are released from the top of the same ramp and onto a flat surface. Which ball will roll the farthest?

1. bowling ball
2. tennis ball
3. baseball
4. ping pong ball

1. Force is measured in

1. Newtons
2. Kg
3. m/s/s
4. kg/hr

1. ______is a push or a pull.

1. ______can cause an object to change direction, stop or accelerate.

1. ______is a force that opposes motion between two surfaces that are touching.

1. True or False

______Friction is in the same direction as an objects motion.

______Friction increases with a larger mass.

______Friction is eliminated with a lubricant.

1. The net force on a falling object is zero. Which is true?

1. Acceleration is zero.
2. The object falls at a constant velocity.
3. Both a and b.
4. None of the above.

1. The same object has

1. the same weight on the moon as on earth.
2. the same mass on the earth as the moon.
3. the same weight and mass on the moon and earth.
4. different mass and weight on the earth and the moon.

Show all work on the following questions

1. You have been running at 8 m/s for 1 minute. How far have you run?

1. You are in a race car and after 10 seconds you are travelling at 23 m/s from a dead stop. What is your acceleration?

1. You are on a moving walkway at Dulles airport which is moving east at 5 m/s. You are walking east on the walkway at 2 m/s. What is your resultant velocity?

1. What is the acceleration of a 100 kg mass if a force of 60 N acts on it? (F = m x a)

1. A student is pushing on a box with a force of 8 N north. Another student is pushing on the same box with a force of 9 N north. What is the net force?