Grade 11 Mechanics

An object had a p_i of 30kgm/s and ended with a p_f of 40 kgm/s. What was the impulse?

• 2 kg m/s

• 10 kg m/s

• 70 kg m/s

• 5 kg m/s

An object has P_i of 20kgm/s ends up with a P_f of 40kgm/s. How long would a 5N force needed to act?

• 3s

• 8s

• 7s

• 4s

What is the kinetic energy at point C?

• 200J

• 100J

• 300J

• 20J

A spring with constant of 1500 N/m is stretched 20 cm from its rest position. Determine the energy stored in the spring.

• 30 J

• 300,000 J

• 150 J

• 15,000 J

A ball is thrown downward from the top of a roof with a speed of -25 m/s. After 2 s, its velocity will be

• 19.6 m/s

• -5.4 m/s

• -44.6 m/s

• 44.6 m/s

A car is traveling at 21.0 m/s. It slows to a stop at a constant rate over 5.00 s. How far does the car travel during those 5.00 seconds before it stops? 

• 4.20 m
• 52.5 m
• 105 m
• 158 m

Tags

NGSS.HS-PS2-1

At what point is v_y= 0 m/s?

• A

• B

• C

• D

• None of these points

If you throw a baseball straight up, what is its acceleration at the highest point?

• 9.81 m/s²

• 9.81 m/s

• 0 m/s²

• 0 m/s

A 2.0 kg object is sliding down a slope inclined at 30 degrees to the horizontal. A frictional force of 0.5 N acts on the object, calculate its acceleration.

• 4.7 ms^-2

• 4.66 ms^-2

• 5.2 ms^-2

• 5.16 ms^-2

The coefficient of friction, μ, is a number between 0 and 1 the tells us the relationship between the two surfaces in contact. A low value for μ means that...

• the object slides easily

• the object is hard to move

• the object will never move

• the object requires a large force to move