Units 2.3 and 2.4 Work, Power, Energy and Momentum

Units 2.3 and 2.4 Work, Power, Energy and Momentum

11th - 12th Grade

10 Qs

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Units 2.3 and 2.4 Work, Power, Energy and Momentum

Units 2.3 and 2.4 Work, Power, Energy and Momentum

Assessment

Quiz

Physics

11th - 12th Grade

Hard

Created by

Neil Lithgo

Used 76+ times

FREE Resource

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

An object of mass m is sliding down a ramp at constant speed. During the motion it travels a distance x along the ramp and falls through a vertical distance h. The coefficient of dynamic friction between the ramp and the object is μ. What is the total energy transferred into thermal energy when the object travels distance x?

mgh

mgx

μmgh

μmgx

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An object has a weight of 6.10 × 102 N. What is the change in gravitational potential energy of the object when it moves through 8.0 m vertically?

5 kJ

4.9 kJ

4.88 kJ

4.880 kJ

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A boat with an output engine power of 15 kW moves through water at a speed of 10 m s-1. What is the resistive force acting on the boat?

0.15 kN

0.75 kN

1.5 kN

150 kN

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

An astronaut is moving at a constant velocity in the absence of a gravitational field when he throws a tool away from him.

What is the effect of throwing the tool on the total kinetic energy of the astronaut and the tool and the total momentum of the astronaut and the tool?C

A

B

C

D

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

A ball of mass m collides with a wall and bounces back in a straight line. The ball loses 75 % of the initial energy during the collision. The speed before the collision is v.


What is the magnitude of the impulse on the ball by the wall?

(132)mv\left(1-\frac{\sqrt{3}}{2}\right)mv

12mv\frac{1}{2}mv

54mv\frac{5}{4}mv

32mv\frac{3}{2}mv

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An object falls from rest from a height h close to the surface of the Moon. The Moon has no atmosphere.
When the object has fallen to height  h4\frac{h}{4}  
above the surface, what is
                   
 kinetic energy of the object at h4gravitational potential of object at h\frac{kinetic\ energy\ of\ the\ object\ at\ \frac{h}{4}}{gravitational\ potential\ of\ object\ at\ h}  ?

 34\frac{3}{4}  

 43\frac{4}{3}  

 916\frac{9}{16}  

 169\frac{16}{9}  

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Child X throws a ball to child Y. The system consists of the ball, the children and the Earth. What is true for the system when the ball has been caught by Y?

The momentum of child Y is equal and opposite to the momentum of child X.

The speed of rotation of the Earth will have changed.

The ball has no net momentum while it is in the air.

The total momentum of the system has not changed.

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