Mechanics

1

100

What is the term for the rate of change of velocity with respect to time?

Acceleration

200

• A car travels 60 m in 4 seconds. What is its average speed?

15 m/s

300

If an object is dropped from rest, what is the equation to calculate its velocity after falling for t seconds?

v=at

400

• An object is thrown vertically upward with an initial velocity of 20 m/s. How long does it take to reach its highest point?

2 seconds

500

What is the displacement of an object undergoing uniform acceleration from rest after t seconds, if its acceleration is a?

a = 1/2 at²

2

100

• Which of Newton’s laws explains why seat belts are necessary in cars?

Newton’s First Law

200

What is the net force acting on a 10 kg object accelerating at 2 m/s²?

20 N

300

• If a 50 N force acts on a box at rest, and friction provides a 50 N opposing force, what will happen to the box?

The box will remain at rest

400

A force of 10 N accelerates a 2 kg block across a friction-less surface. What is the block’s acceleration?

5 m/s²

500

According to Newton’s Third Law, when you push against a wall, why doesn’t the wall move?

Because the wall exerts an equal and opposite force, but its mass and foundation prevent noticeable motion?

3

100

What force opposes motion and acts parallel to the surface of contact?

friction

200

A 10 kg object is suspended by a string. What is the tension in the string if the object is at rest?

98 N

300

On an inclined plane, what force component causes an object to slide down the slope?

F_ll = mgsin⁡θ

400

A 50 kg person stands in an elevator accelerating upwards at 2 m/s². What is the normal force acting on the person?

590 N

500

A 3 kg object is lifted vertically to a height of 4 meters.

What is the speed  when it hits back the ground.

8.86 m/s.

4

100

What is the SI unit of work?

Joules

200

What is the equation for the kinetic energy?

1/2mv²

300

A 10 N force moves an object 5 m in the direction of the force. How much work is done?

50 J

400

A spring with a spring constant of 200 N/m is compressed by 0.1 m. How much elastic potential energy is stored?

1 J

500

A 2 kg object is lifted vertically 3 m at a constant speed. What is the work done against gravity?

58.8 J

5

100

A force of 10 N is applied to a block at an angle of 30° above the horizontal. If the block is moved 5 m horizontally, how much work is done by the force?

43.3 J

200

A 2 kg object slides down a frictionless incline of height 4 m. What is its speed at the bottom?

 8.85 m/s

300

A car of mass 1,000 kg traveling at 20 m/s comes to a stop after applying the brakes. If the brakes exert a constant force, how much work is done to stop the car?

−200,000 J

400

A spring with a spring constant of 500 N/m is compressed by 0.2 m and then used to launch a 2 kg object horizontally. What is the object’s speed after being launched?

5 m/s

500

A block of mass 5 kg is pushed up a frictionless incline of 3 m height and 5 m length by a constant force. If the block reaches the top with a speed of 2 m/s, what is the work done by the force?

160 J