Physics Section 2 Quiz

Joe is trying to tackle Carson while Carson is standing still. Joe is running at 15 m/s and has a mass of 32 kg. Carson has a mass of 64 kg. What is their final velocity, assuming this is a perfectly inelastic collision? (do not write units)

What is an elastic collision?

• An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies is different.

• An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.

• An inelastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.

What is an inelastic collision?

• When two objects collide, becoming stuck together and internal kinetic energy is lost (but not really lost, it transfers to different forms of energy)

• When two objects collide, becoming stuck together and internal kinetic energy is lost

• When two objects don't collide, becoming stuck together and internal kinetic energy is lost (but not really lost, it transfers to different forms of energy)

If the mass of object 1 is 10 kg and is travelling at a velocity of 40 m/s, and the mass of object 2 is 6 kg travelling towards object 1 at 13 m/s (so is think about it as a vector!). This is an head on elastic collision when object 2 is travelling 5 m/s after the collision. What is the velocity of object 1? Don't write units

For every action, there is an equal and opposite reaction.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

• none of these

A car has 10,800 Kg x m/s of momentum as it collides with a trash dumpster AT REST. How much TOTAL MOMENTUM will the car and dumpster have after collision?

• Less than 10,800 Kg x m/s

• More than 10,800 Kg x m/s

• The same. 10,800 Kg x m/s

• Not enough information.

Which of the following is not a type of friction force?

• Static Friction

• Kinetic Friction

• Rolling Friction

• Rough Friction

The mass of a brick is 5kg, and it is stationary. What is the maximum static friction if the coefficient is 0.66?

• 3.3

• 33

• 3.3N

• 33N

There are 25N of friction that keep a 10kg brick moving at a constant rate. What is the coefficient of friction?

• 0.25

• 0.25N

• 4

• 4N

If these teams are pulling with the same amount of force what will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.