Physics: Newton Third Law

Multiple Choice

According to Newton's Third Law, what happens when one object exerts a force on a second object?

• The second object exerts an equal and opposite force on the first object.

• The second object exerts a smaller force on the first object.

• The second object does not exert any force on the first object.

• The second object exerts a force in the same direction as the first object.

Multiple Select

Which of the following scenarios best illustrate Newton's Third Law of Motion?

• A baseball bat hitting a ball and the ball pushing back on the bat.

• A car accelerating on a road.

• A bowling ball striking a pin and the pin pushing back on the ball.

• A person standing still.

Multiple Choice

What is the SI unit of momentum?

• kg·m/s

• N·s

• m/s

• kg·m

Multiple Choice

According to Newton's Second Law, what does the product of force and time (F × t) represent?

• Impulse

• Work

• Power

• Energy

Multiple Choice

In the example with two carts, which physical quantity is the same for both carts?

• Impulse

• Acceleration

• Force

• Velocity

Multiple Select

Which of the following statements about the conservation of linear momentum are correct?

• Momentum is conserved in the absence of external forces.

• Momentum before collision equals momentum after collision.

• Momentum is always zero after a collision.

• Momentum can change if external forces act on the system.

Open Ended

Describe a real-life situation (other than collisions) where the conservation of momentum can be observed, and explain how momentum is conserved in that situation.

Multiple Choice

What is the total momentum of the system before the brick is dropped onto the cart?

• 150 kg·cm/s

• 0 kg·cm/s

• 50 kg·cm/s

• 3 kg·cm/s

Multiple Choice

What is the combined momentum of the line-backer and the football fullback before the collision?

• 20 kg·m/s, west

• 120 kg·m/s, west

• 100 kg·m/s, east

• 0 kg·m/s

Open Ended

Explain the principle of conservation of momentum using the example of the line-backer and football fullback collision.

Open Ended

If the mass of ball A was doubled, how would the velocity after collision change?

Multiple Select

Which of the following statements are true about the collision between balls A and B as described in the exercise?

• The total momentum before and after the collision is the same.

• The velocity after collision is 2 m/s east.

• The mass of ball A is 4 kg.

• Ball B was initially moving at 10 m/s.

Multiple Choice

Which of the following forces acts upward on the book in the free-body diagram shown?

• F_grav

• F_app

• F_norm

• F_frict

Open Ended

After learning about force and motion, what is one real-life situation where you have observed the effects of friction?