Physics- Chapter 10 Test Review

Kate pushes a box at constant speed with a constant force of 13 N up a frictionless incline 13 m long. If the box weighs 77 N, how high off the ground does she push it?

• 4.4 m

• 0.17 m

• 0.46 m

• 2.2 m

• 1.1 m

Answer explanation

The mass m = 2.5 kg swings like a pendulum. If the maximum height h = 17 cm, what is the maximum velocity of the ball?

• 3.3 m/s

• 18 m/s

• 7.0 m/s

• 1.8 m/s

• 4.2 m/s

Answer explanation

The driver of a 960 kg car traveling at 13 m/s suddenly sees a stop sign 80 m away. How much force must be applied using the brakes for the car to stop just in time?

• 81000 N

• 1000 N

• 1.1 N

• 2000 N

• 78 N

Answer explanation

Ryan's toboggan is sliding across a level, icy field at a speed of 3.0 m/s. If the coefficient of kinetic friction between the toboggan and ground is 0.10, how far does Ryan travel before coming to a stop?

• 9.2 m

• 0.46 m

• 1.5 m

• 4.6 m

• 45 m

Answer explanation

A hockey puck with mass 0.23 kg slides across the ice. A hockey player uses her stick to slow down the puck by applying a 6.5 N force over a distance of 0.70 m. What is the change in the energy of the puck?

• 42 J

• 4.5 J

• 1.0 J

• 0.11 J

• 9.3 J

Answer explanation

Consider a rubber ball which has an efficiency in one bounce of 31%. (That means 31% of the kinetic energy before the bounce remains kinetic energy after the bounce, while the rest of the energy is converted to thermal energy.) If the ball drops from a height of 8 m, then how high does it bounce back on the first bounce?

• 8.0 m

• 2.0 m

• 2.5 m

• 10.5 m

• 5.5 m

Answer explanation

A 40 kg stone falls from the top of a 340 m cliff. Neglecting friction, how fast will the stone be moving just before it hits the ground?

• 520 m/s

• 58 m/s

• 6700 m/s

• 41 m/s

• 82 m/s

Answer explanation

A man accelerates a crate across a rough, level floor with an efficiency of 50%. Which is true?

• The work done by the man equals the distance the crate moves multiplied by the friction.

• If the floor were smooth, the man's efficiency would decrease.

• Energy would still not be conserved if the man were to push the crate at an angle.

• The concept of efficiency is not applicable here because there is no technology or machinery present.

• Part of the man's work goes into the kinetic energy of the crate, while the other part of his work is done against friction.

Answer explanation

How much distance does it take to stop a car going 29 m/s (65 mph) if the brakes can apply a force equal to one-half the car's weight?

• 840 m

• 3.0 m

• 170 m

• 43 m

• 86 m

Answer explanation

A vertical spring with k = 6000 N/m is compressed 0.060 m. A 0.14 kg ball is placed on top of the spring and released, launching it into the air. How far above the launching point—corresponding to the spring’s free length—is the ball when it has a speed of 4.0 m/s? (Neglect air friction.)

• 14 m

• 69 m

• 0.99 m

• 130 m

• 7.1 m

Answer explanation