U1- Grade 8 Exam

A ball on top of a table exerts force on a table. What will keep the ball from falling or moving from its current position?

• the force of gravity

• the force exerted by the table

• no force acting on the book because it is stable

• the force exerted by the table and the force of gravity

What would cause a rolling ball to stop after sometime?

• the force that was already used up

• friction

• the force acting on the ball was decreasing

• the amount of force was not enough

If an object initially at rest is under an unbalanced force, will it move in what direction?

• direction of the balanced force

• direction of the unbalanced force

• direction of both the balanced and unbalanced force

• direction of either of the forces

In uniform circular motion, the whirling object accelerates because __________.

• there is a change in speed

• there is a change in direction

• both changes

• all of the above

Bodies in uniform circular motion require the application of _______ and the motion is directed toward the center of the circle. 

• Equal forces

• Constant force 

• Unbalanced forces

• Balanced Forces

When work is done, it is accompanied by a change in energy. What happens when work is done by an object?

• It gains energy.

• It loses energy.

• It either gains or loses energy.

• It neither loses or gains energy.

Which of the following statements best describes the relationship of work to power?

• Work is a way of using energy while power is a way of losing energy.

• Work is a way of transferring energy while power is the rate of using energy.

• Work is the capacity to do work while power is the capacity to transfer energy.

• Work is a measure of one's ability while power is a measure of one's capacity.

Which of the following differentiates potential energy from kinetic energy?

• Potential energy is the energy in moving objects while Kinetic energy is the energy in objects in position.

• Potential energy is the energy in moving objects while Kinetic energy is the energy in objects in position.

• Potential energy is the energy in objects in position while kinetic energy is a

  stored energy.

• Potential energy is the energy for power output while kinetic energy is the

  energy for work output.

A rolling bail possesses kinetic energy, while water in a dam possesses ______

• Potential energy

• Kinetic energy

• Energy in motion

• Moving energy

What will happen to the KE of an object if its mass is doubled but the velocity remains the

same?

• The KE will remain the same

• The KE will be doubled

• The KE will be tripled

• The KE will be quadrupled