REVIEW FOR MIDTERM EXAM

1. The property of a object at rest to remain at rest is known as _____________.

• acceleration

• velocity

• inertia

• action-reaction

2. The same net force is applied to object A and object B. The observed accelerations of the two objects are not the same; object A has accelerated faster than object B. Which of the following is correct?

• Object A has more mass than of object B.

• Object A has less mass of object B.

• Object A and B has the same mass.

• Object A has more friction than object B.

3. What is the net force on an 800-kg airplane flying with a constant velocity of 160 km/hour north?

4. What is the mass of a cart that has an acceleration of 5 m/s/s when a net force of 2000 N is applied to it?

• 10,000 kg

• 2000 kg

• 1000 kg

• 400 kg

5. Newton's Third Law of Motion states that, in every action there is an ______________ reaction.

6. What has to happen when a force is exerted on an object for work to be done?

• the object stays still

• the object is heavy

• the object moves

• none of these

7. A truck driver is trying to push a loaded truck with an applied force of 80N. Unfortunately, his attempt was unsuccessful the truck stays stationary no matter how hard the driver pushes. How much work is done by the driver?

• -80 J

• 80 J

• 0 J

• None of the above.

8. A machine does 2500 J of work in 1 min. What is the power developed by the machine?

10. A _________ ________ happens when force acts upon a moving object to hinder its displacement.

11. What is the formula for Gravitational Potential Energy?

• PE = mgh

• PE = F*d

• PE = 1/2m*v2

• P = W/t