Forces and Motion Concepts

The video tutorial covers net force practice problems, explaining how to calculate force, mass, and acceleration using the equation F=ma. It includes examples like a skier's acceleration, an elevator in free fall, and a sled being pushed. The tutorial emphasizes understanding units and the concept of weight as a force due to gravity. It also discusses the effects of air resistance and friction on acceleration.

What is the unit of force in the International System of Units?

• Meter

• Newton

• Kilogram

• Second

If a 66 kg skier accelerates at 2 m/s², what is the force applied?

• 33 N

• 198 N

• 132 N

• 66 N

What is the force on a 1000 kg elevator in free fall?

• -9800 N

• 1000 N

• -1000 N

• 9800 N

How do you calculate acceleration if you know the force and mass?

• a = m / F

• a = F + m

• a = F / m

• a = F * m

A 50 kg skater is pushed with a force of 250 N. What is the acceleration?

• 5 m/s²

• 10 m/s²

• 15 m/s²

• 20 m/s²

What is the mass of an object if a force of 250 N causes it to accelerate at 5 m/s²?

• 100 kg

• 75 kg

• 50 kg

• 25 kg

If two bowling balls are rolled with the same force but different accelerations, what can be inferred?

• The lighter ball has more acceleration

• The heavier ball has more acceleration

• Acceleration is independent of mass

• Both have the same acceleration

What is the acceleration of a 5 kg block pulled with a 40 N force against 8 N friction?

• 5.6 m/s²

• 6.4 m/s²

• 8 m/s²

• 4 m/s²

What is the acceleration due to gravity on Earth in a vacuum?

• 1 m/s²

• 0 m/s²

• -9.81 m/s²

• 9.81 m/s²

How does air resistance affect the acceleration of a falling object?

• Reverses acceleration

• No effect

• Decreases acceleration

• Increases acceleration