Physics Final Eam

If a 350 kg car is only accelerating at 4 m/s², with what force must be used to continue the car moving?

• 87.5 N

• 1,400 N

• 87.5 m

• 1,400 m

When we calculate net force we must

• Add up opposing forces

• Subtract opposing forces from one another

• Divide opposing forces

• Multiply opposing forces

Which of the following best describes a nuclear reaction?

• Nuclear fusion is occurring because many smaller nuclei are being fused.

• Nuclear fission is occurring because large amounts of energy are being absorbed.

• Nuclear fusion is occurring because many energetic neutrons are being emitted

• Nuclear fission is occurring because a nucleus is being split into smaller nuclei.

What is the difference in momentum between a 53-kg athlete running 3.58 m/s and a 880.-kg car traveling 1.03 m/s?

• 130 kg·m/s

• 720 kg·m/s

• 1,100 kg·m/s

• 2,100 kg·m/s

Which of the following is the best evidence that work has been done on or by an object?

• The energy of the object has changed.

• The energy of the object has decreased

• The energy of the object has increased

• The direction the object is moving remains constant.

Mechanical energy changes to chemical energy

• Mechanical energy changes to chemical energy

• Heat and light energy changes to chemical energy

• Mechanical energy changes to chemical energy

• Mechanical energy changes to heat and light energy.

What value does the acceleration of gravity constant equal?  It is usually represented by the letter g.

• 8.1 m/s²

• 98.1 m/s²

• 10 m/s²

• 9.81 m/s²

What is Newton's third law of motion?

• An object in motion remains in motion unless acted upon by an external force.

• An object at rest remains at rest unless acted upon by an external force.

• For every force, there is an equal and opposite force.

• For every force, there is no reaction by another force.

The force exerted when snow falls from the sky is considered what type of force? 

• gravity

• acceleration

• free-fall

• applied force

Which of the following correctly states Newton's 2nd Law of Motion? 

• Force is equal to mass divided by acceleration

• Force is equal to mass minus acceleration

• Force is unequal to mass multiplied by acceleration

• Force is equal to mass multiplied by acceleration