Physics 12th Grade Quiz #1 Mr. Ramos

A 0.50 kg football is thrown with a velocity of 15 m/s to the right. A stationary receiver catches the ball and brings it to rest in 0.020 s. What is the force exerted on the ball by the receiver?

• $350\ N$

• $-375\ N$

• $-350\ N$

• $375\ N$
  

A 0.50 kg object is at rest. A 3.00 N force to the right acts on the object during a time interval of 1.50 s. Whats is the velocity of the object at the end of this time interval?

• $7.5\ \frac{m}{s}$

• $9.0\ \frac{m}{s}$

• $8.0\ \frac{m}{s\ }$

• $5.0\ \frac{m}{s\ }$

A 3500 kg car traveling to the north is slowed down uniformly from an initial velocity of 25.0 m/s by a 6250 N braking force acting opposite the car’s motion. How long does it take the car to come to a complete stop?

•  $8\ s$ 

•  $-14\ s$ 

•  $-8\ s$ 

•  $14\ s\$ 

A 2240 kg car traveling to the west slows down uniformly from 20.0 m/s to 5.00 m/s. How long does it take the car to decelerate if the force on the car is 8410 N to the east? How far does the car travel during the deceleration?

• $5.00\ s,\ 40.0\ m$

• $4.00\ s,\ 40.0\ m$

• $4.00\ s,\ 50.0\ m$

• $5\ s,\ 50.0\ m$

For a given change in momentum, if the net force that is applied to an object increases, what happens to the time interval over which the force is applied?

• The time interval increases.

• The time interval decreases.

• The time interval stays the same.

• It is impossible to determine the answer from the given information.

Calculate the linear momentum for a proton with mass

 $1.67\ \times10^{-27}$ kg moving with a velocity of   $6.50\ \times\ 10^{6\ }$  m/s straight up.

•  $10.86\ \times10^{-21}$   $kg\cdot\frac{m}{s}$  

•  $8.86\ \times10^{-21}$   $kg\cdot\frac{m}{s}$  

•  $9.86\ \times10^{-21}$   $kg\cdot\frac{m}{s}$  

•  $10.86\ \times10^{-20}$   $kg\cdot\frac{m}{s}$