Question 1

Which of the following quantities has the same dimensions as acceleration?

Accepted Answer

$$\frac{v^2$}{r}$$

Question 2

A car is moving at 20 m/s and comes to a stop in 5 seconds with constant acceleration. What is the magnitude of its acceleration?

Accepted Answer

$$4\ \mathrm{m/s^2$}$$

Question 3

A 2 kg block is pulled across a horizontal surface with a force of 10 N. If the coefficient of kinetic friction is 0.2, what is the acceleration of the block? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$3\ \mathrm{m/s^2$}$$

Question 4

A ball is thrown horizontally from a 45 m high cliff with a speed of 10 m/s. How far from the base of the cliff does the ball land? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$30\ \mathrm{m}$$

Question 5

Which of the following statements about an object moving in a circle at constant speed is correct?

Accepted Answer

The object has a nonzero acceleration directed toward the center of the circle.

Question 6

A 1500 kg car traveling at 25 m/s comes to a stop over a distance of 50 m. What is the magnitude of the net force acting on the car?

Accepted Answer

$$9375\ \mathrm{N}$$

Question 7

A 5 kg block is suspended by a rope. What is the tension in the rope if the block is at rest? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$49\ \mathrm{N}$$

Question 8

A 2 kg object is moving at 10 m/s. What is its kinetic energy?

Accepted Answer

$$100\ \mathrm{J}$$

Question 9

A 1000 kg car increases its speed from 10 m/s to 20 m/s. What is the work done on the car?

Accepted Answer

$$150,000\ \mathrm{J}$$

Question 10

A block slides down a frictionless incline of height 5 m. What is its speed at the bottom? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$10\ \mathrm{m/s}$$

Question 11

A 3 kg object is acted upon by a net force of 12 N. What is its acceleration?

Accepted Answer

$$4\ \mathrm{m/s^2$}$$

Question 12

A 2 kg block is attached to a rope and hangs vertically. If the block is accelerating upward at $$2\ \mathrm{m/s^2$}$$, what is the tension in the rope? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$24\ \mathrm{N}$$

Question 13

A 0.5 kg ball is thrown straight up with an initial speed of 8 m/s. What is the maximum height it reaches? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.2\ \mathrm{m}$$

Question 14

A 10 kg box is pulled up a 30° incline at constant speed. If the coefficient of kinetic friction is 0.1, what is the frictional force? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$8.7\ \mathrm{N}$$

Question 15

A 2 kg object moves in a circle of radius 4 m at a speed of 6 m/s. What is the magnitude of the centripetal force?

Accepted Answer

$$18\ \mathrm{N}$$

Question 16

A 1.5 kg object is dropped from rest from a height of 20 m. What is its speed just before hitting the ground? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$20\ \mathrm{m/s}$$

Question 17

A 3 kg block is pushed with a force of 15 N across a horizontal surface. If the block moves 4 m, how much work is done by the force?

Accepted Answer

$$60\ \mathrm{J}$$

Question 18

A 2 kg object is moving with a velocity of $$\vec{v} = 3\hat{i} + 4\hat{j}\ \mathrm{m/s}. $$What is the magnitude of its momentum?

Accepted Answer

$$10\ \mathrm{kg\cdot m/s}$$

Question 19

A 1000 kg car traveling at 15 m/s collides with a stationary 800 kg car. If they stick together after the collision, what is their final speed?

Accepted Answer

$$8.33\ \mathrm{m/s}$$

Question 20

A 2 kg block is at rest on a horizontal surface. The coefficient of static friction is 0.4. What is the maximum force that can be applied horizontally before the block starts to move? (Take $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$8\ \mathrm{N}$$

Physics 1: Mechanics – Key Concepts, Formulas, and Problem-Solving Strategies

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