Grade 11 Energy and momentum

A massive object will always have more momentum than a smaller object.

• True

• False

Tags

NGSS.HS-PS2-2

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

A 80kg woman skates towards a stationary child of mass 40 kg. She picks the child up. Calculate the new velocity of the woman and child.

• 3m/s

• 5m/s

• 1m/s

• 4m/s

A force of 10 N is applied at an angle of 60^o to the horizontal. If the distance moved by the box is 30m, calculate the work done.

• 30J

• 300J

• 40J

• 150J

What is the kinetic energy at point C?

• 200J

• 100J

• 300J

• 20J

A 60 kg box is lifted by a rope a distance of 10 meters straight up at constant speed. How much power is required to complete this task in 5 seconds?

• 5880 J

• 1176 W

• 5880 W

• 1176 J

A 1000 kg car is driving at 25 m/s. Determine its kinetic energy.

• 312,500 J

• 12,500 J

• 25,000 J

• 625,000 J

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

The kinetic energy of and object with mass m and speed v is E_k. The mass is now double but the velocity is halved. What is the new kinetic energy of the object?

• E_k

• E_k/2

• E_k/4

• 2E_k