PRACTICE QUIZ 5A

Answer the following.  Show all work and circle your answers.

1. Using only kg, s, and m write out the units for...

a. velocity

b. acceleration

c. mass

d. force

 

2. Determine the weight of each of the following masses on the surface of the Earth.

a. 120 g

b. 34 kg

c. 8.7 x 10⁴ kg

 

3. Determine the mass of each object given the following weights.

a. 87 N

b. 0.045 N

c. 1.2 x 10³ N

  

4. A towrope is used to pull a 1750 kg car, giving it an acceleration of 1.35 m/s². What force does the rope exert?

 

 

 

 

5. Karen's car weighs 12,300 N. If the engine exerts a force of 1960 N, what is the acceleration of the car?

 

 

 

 

6. A high jumper, falling at 4.0 m/s, lands on a foam pit and comes to rest, compressing the pit 0.40 m. If the pit is able to exert an average force of 1200 N on the high jumper in breaking the fall, what is the jumper's mass?

 

 

 

 

 

 

 

7. A 200 N crate lies on the floor. The coefficient of static friction between the crate and the floor is 0.60. What is the minimum force required to start the crate sliding?

 

 

 

8. Police, examining the scene of an accident, observe skid marks 30.0 m long left by a 1200 kg car. The car skidded to a stop on a concrete highway having a coefficient of kinetic friction with the tires of 0.80. Estimate the car's speed at the beginning of the skid.