Physics Quiz - Newton's Laws and Work

Question 1

A beach ball is left in back of a pickup truck. Describe what happens to the ball when the truck accelerates forward?

Accepted Answer

Ball moves toward back of truck

Question 2

Block slides down inclined plane at angle of 37. Acceleration of block is 2.4 m/s2, find coefficient of kinetic friction

Accepted Answer

0.44

Question 3

Friction force is _________ to the normal force

Accepted Answer

Proportional

Question 4

Which of the following examples shows work being done (by the physics definition)?

Accepted Answer

Hayden throws football to Dylan who scores and the crowd goes wild

Question 5

What physical quantity is a measure of the amount of inertia an object has?

Accepted Answer

Mass

Question 6

Would the parachute in the last question be doing positive work or negative work?

Accepted Answer

Negative

Question 7

Parachute on 8820N racecar opens end of run when car at 35m/s. What force supplied by parachute so car stops in 1100m?

Accepted Answer

503 Newtons

Question 8

2000kg car starts from rest. Horizontal force from engine 6000N, how fast will car be able to reach a speed of 25 m/s?

Accepted Answer

8.3 seconds

Question 9

Puck is hit on lake and moving at 12m/s. Five sec later, speed 6m/s. Puck's avg acceler? Coefficient kinetic friction?

Accepted Answer

Acceleration -1.2m/s2, Uk 0.12

Question 10

Which coefficient of friction is always greater?

Accepted Answer

Static friction

Question 11

40kg girl and 8.4kg sled on ice pond, 15m apart connected by rope. Girl exerts 5.2N force rope. Acc of girl? Acc sled?

Accepted Answer

Girl 0.13m/s2; Sled 0.62m/s2

Question 12

If a neighbor pushes a lawnmower four times as far as you but exerts half the force, who did more work and by how much?

Accepted Answer

Neighbor, 2x as much

Questions 12