Physics Mechanics Review

A vector has magnitude R and perpendicular components P and Q, as shown in the diagram.
Which row correctly describes the perpendicular components? 

• A
• B
• C
• D

The graph shows how the velocity v of an object moving in a straight line varies over time t = 0 to t = T.
Which graph represents the displacement s of the object in the time t = 0 to t = T ? 

• A
• B
• C
• D

A brick is dislodged from a building and falls vertically under gravity.
Which graph best represents the variation of its height h above the ground with time t if air resistance is negligible? 

• A
• B
• C
• D

A projectile is launched at point O and follows the path OPQRS, as shown. Air resistance may be neglected.
Which statement is true for the projectile when it is at the highest point Q of its path? 

• The horizontal component of the projectile’s acceleration is zero. 
• The horizontal component of the projectile’s velocity is zero. 
• The kinetic energy of the projectile is zero. 
• The momentum of the projectile is zero. 

Tags

NGSS.HS-PS2-1

Which row correctly states whether momentum and kinetic energy are conserved in an inelastic collision in which there are no external forces? 

• A
• B
• C
• D

Tags

NGSS.HS-PS2-2

A box of mass 8.0 kg rests on a horizontal, rough surface. A string attached to the box passes over a smooth pulley and supports a 2.0 kg mass at its other end.
When the box is released, a frictional force of 6.0 N acts on it.
What is the acceleration of the box?

• 1.4ms^–2 
• 1.7ms^–2 
• 2.0ms^–2 
• 2.5ms^–2 

Tags

NGSS.HS-PS2-1

A car engine exerts an average force of 500 N in moving the car 1.0 km in 200 s.
What is the average power developed by the engine? 

• 2.5W
• 2.5kW
• 100kW
• 100MW

The graph is a speed versus time graph for an object that is moving in a straight line.
The distance travelled by the object during the first 4.0 seconds is 

• 80 m 
• 40 m
• 20 m
• 5 m

The graph below shows the variation with time t of the velocity v of an object moving along a straight line.
The displacement of the object between t = 0 s and t = 6.0 s is 

• 2.0 m
• 12 m
• 20 m
• 24 m

A stone is thrown downwards from the edge of a cliff with a speed of 5.0 m/s. It hits the ground 2.0 seconds later. What is the height of the cliff?

• A. 20 m

• B. 30 m

• C. 40 m

• D. 50 m

Tags

NGSS.HS-PS2-4