QUIZ 2 2425

1. The work done of vectors force, F and displacement, s can be calculated using

• cross product
• dot product
• addition of two vectors
• subtraction of two vectors

2. Gravitational potential energy depends on these quantities EXCEPT

• mass.
• velocity.
• height from the ground.
• gravitational acceleration.

3. The principle of conservation of energy states that

• in an isolated system, total energy is conserved.
• kinetic energy is always equal to the potential energy.
• the net work done on the system equals the change in kinetic energy
• energy can be created and destroyed, it can only be transferred or changed from one form to another.

4. The work energy theorem stated that

• work done on an object is equals to the change in its kinetic energy
• work done on an object comes from the kinetic energy.
• work and kinetic energy are the same thing.
• work and kinetic energy cannot co–exist at the same time.

5. What is the definition of average power?

• The rate at which work is done
• Energy changing forms
• The ability to do work.
• The energy of motion.

6. Revolution per second ( r.p.s) is the unit of angular

• momentum.
• acceleration.
• displacement.
• velocity.

7. An object travelling in a circle at constant speed

• is moving with constant velocity
• may be slowing down or speeding up.
• experiences no acceleration.
• experiences an acceleration towards the centre of the circle

8. Which of the following increase the centripetal force?

• Increasing the radius.
• Decreasing the mass.
• Increasing the velocity
• Decreasing the velocity.

9. Angular velocity changes with time interval is called

• angular displacement
• average angular velocity.
• average angular acceleration.
• average angular speed.

10. Which of the following pairs is FALSE about parameters in linear motion and rotational motion?

• A
• B
• C
• D