Understanding Kinetic Energy and Work

What is the mass of the car used in the problem?

• 1000 kg

• 500 kg

• 2000 kg

• 1500 kg

What is the force applied by the engine to accelerate the car?

• 7000 N

• 6000 N

• 8000 N

• 5000 N

What is the formula for kinetic energy?

• force times displacement

• one-half mass times velocity squared

• mass times velocity

• mass times acceleration

Which forces are considered in the free body diagram of the car?

• Friction and air drag

• Force by the engine, normal force, and gravity

• Only the force by the engine

• Only gravity

How much work is done by the engine on the car?

• 700,000 joules

• 600,000 joules

• 500,000 joules

• 800,000 joules

What is the final velocity of the car after traveling 100 meters?

• 37.4 m/s

• 57.4 m/s

• 47.4 m/s

• 27.4 m/s

What is the relationship between work and kinetic energy in this problem?

• Work is greater than kinetic energy

• Work is less than kinetic energy

• Work is equal to kinetic energy

• Work is unrelated to kinetic energy

Why is kinetic energy considered a scalar quantity?

• It depends on direction

• It is independent of direction

• It is always positive

• It is always negative

If the car were to accelerate in the opposite direction, what would be the final velocity?

• Depends on the force

• -37.4 m/s

• 0 m/s

• 37.4 m/s

What does the conclusion emphasize about kinetic energy?

• It is unrelated to work

• It is dependent on direction

• It is a vector quantity

• It is independent of direction